....

MEMORANDUM
REGIONAL FLOOD CONTROL DISTRICT
FLOODPLAIN MANAGEMENT DMSION

DATE:

February 27, 2006

TO:

Floodplain Management Division Staff

FROM:

Eric Shepp, P.E., Division Manager
Floodplain Management Division

SUBJECT:

Use of Special Study 16- Upper Canada Del Oro Wash

Questions have arisen regarding the use of this special study. The study currently includes
two separate documents:

1) Flood Control Study for Canada Del Oro Wash, Catalina Arizona, dated November
1991. This study was prepared in order to determine the number of properties
affected by the COO floodplain, floodway, and erosion hazard setback, and was
intended to prioritize acquisition through the FLAP program. There is no new
analysis in this study, just a cataloging of floodplain/erosion hazard information onto
a single map. Because of the age of this study. much of this information is now
obsolete. As such. this study will be removed from the shelf.
2) Upper Canada Del Oro Wash Letter of Map Revision Study, dated July 1994.
This study was prepared in order to submit to FEMA for potential revision to the
floodplain and floodway boundaries, but was never submitted. However, it is still a
regulatory tool that we should use to assist in establishing Base Flood Elevations.
FPUPs shall incorporate the more restrictive Base Flood Elevation from this study
and the FIS study.

Part of the reason that this was not submitted to FEMA was that some of the
floodplain boundaries were not accurately mapped on the associated topographic
maps. As such, care should be taken when determining BFEs. Individual crosssection locations and water surface elevations are considered to be accurate.
This study will be included in the Special Studies GIS layer as reminder to use this
information when necessary.
Please let me know if you have any questions.
cc:

Chris Cawein, Deputy Director, Regional Flood Control District
Jerry Curless, Manager, Planning and Development Division
Mare Hodshon-Yates, Infrastructure Division

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Verified Statement of Non-Commercial Purpose
Public Data Request
Pima County Government
130 West Congress
Tucson, Arizona 85701

Caution: Arizona Revised Statutes§ 39-121.03 (C) provides:
"A person who obtains public records for a commercial purpose without indicating the
commercial purpose or who obtains a public record for a noncommercial purpose and uses
or knowingly allows the use of such public record for a commercial purpose or who obtains a
public record for a commercial purpose and uses or knowingly allows the use of such public
record for a different commercial purpose or who obtains a public record from anyone other
than the custodian of such records and uses then for a commercial purpose shall in addition .
to other penalties be liable to the state or the political subdivision from which the public
record was obtained for damages in the amount of three times the amount which would have
been charged for the public record had the commercial purpose been stated plus costs and
reasonable attorney's fees or shall be liable to the state or the political subdivision for the
amount of three times the actual damages if it can be shown that the public record would not
have been provided had the commercial purpose of actual use been stated at the time of
obtaining the records."

Verified Statement
I hereby agree that the public records I have requested are not for a "commercial purpose"
as defined by A.R.S. §39-121.03. I also hereby agree that the public records will not be
transmitted or sold to any other person for a commercial purpose.

c/~;-

Name

signature

t,33D N Ca.,.,v>bell ;..~·"#::t2D
tt.Ac..SC>t-~.

A z.

Address (ple'ase print)

<?:571

:zr
Date

~lf)~/D
Date Commission Expires '

LETTER OF MAP REVISION
FOR
UPPER CANADA DEL
PIMA COUNTY,

~ct
.,..

~,. ___

~ o~'

Prepared By:

Prepared For:

David Evans and Associates, Inc.
3845 No. Business Center Drive
Tucson, AZ 85705
(602) 292-2160

Pima County Department of Transportation
201 N. Stone A venue
Tucson, AZ 85701

July, 1994
Revised October, 1994

r
...
I

TABLE OF CONTENTS

..

-

...

.......

•

r'

,.

1.0

2.0

..

.
r'

3.0

,..

,.

4.0

...
l"'

..
...
...

Page

INTRODUCTION

1

1.1

Purpose of Study

1

1.2

Authority and Acknowledgements

1

AREA STUDIED

2

2.1

Scope of Study

2

2.2

Community Description

2.3

Principal Flood Problems

4

2.4

Flood Protection Measures

4

-~

2

ENGINEERING METHODS

5

3.1

Hydrologic Analyses

6

3.2

Hydraulic Analyses

6

FLOOD PLAIN MANAGEMENT APPLICATIONS

8

4.1

Flood Plain Boundaries

8

4.2

Floodways

10

5.0

INSURANCE APPLICATION

13

6.0

LETTER OF MAP REVISION WORK MAP

14

7.0

OTHER STUDIES

14

,.
TABLE OF CONTENTS- Continued
Page

8.0

LOCATION OF DATA

15

9.0

BffiLIOGRAPHY AND REFERENCES

15

FIGURES

,

Figure 1 - Vicinity Map

3

Figure 2 - Floodway Schematic

11

TABLES
Table 1 - Summary of Discharges

6
12

Table 2 - Floodway Data

EXHffiiTS

,.

Exhibit 1 - Flood Profiles

Appendix

Exhibit 2 - Letter of Map
Revision Work Map

Appendix

,.

...
...

...

o1JS

r
LETTER OF MAP REVISION STUDY
UPPER CANADA DEL ORO WASH
PIMA COUNTY, ARIZONA
1.0

INTRODUCTION
1.1

Purpose of Study

The purpose of this Letter Of Map Revision (LOMR) study report is to
revise and update the existing Flood Insurance Study (FIS) and Flood
Insurance Rate Maps (FIRMs) for a portion of the Canada Del Oro Wash

""

within the unincorporated area of Pima County, Arizona. This information

..

will be used by Pima County to update existing flood plain information as
part of the regular phase of the National Flood Insurance Program (NFIP) .

.
I

In some states or communities, flood plain management criteria or

,.

regulations may exist that are more restrictive or comprehensive than

,.

the minimum Federal requirements.
restrictive

criteria

take

precedence

In such cases the more
and

the

State

(or

other

jurisdictional agency) will be able to explain them.

.

1.2

Authority and Acknowledgements

i

The sources of authority for this Flood Insurance Study are the

,..

National Flood Insurance Act of 1968 and the Flood Disaster

..
..

•

Protection Act of 1973 .

The hydraulic analyses for this study were performed by David Evans
and Associates for Pima County under Contract No. 07-04-J-1171671292. This work was completed in July, 1994 .
1

..
2.0

AREA STUDIED

2.1

Scope of Study
This LOMR study covers the unincorporated area of Pima County along

,.

the Canada Del Oro Wash from approximately the boundary of Catalina

..

State Park to the Pinal County line. The area of study is shown on the
vicinity map (Figure 1) .

Riverine flooding along the Canada Del Oro Wash was studied by detailed
method.

2.2

Community Description
This portion of the unincorporated area of Pima County is located near the

...

...

Pima-Pinal County boundary north of Catalina State Park.

The study

reach generally lies within the unincorporated town of Catalina. The town
of Oro Valley is approximately five miles south of the study reach.

r

...

Existing development along the study reach is generally rural, low-density
residential. Golder Ranch Road bridge was constructed in 1987 to provide

r

access to residential development on the hillsides east of the wash.

,..
Although the Canada Del Oro Wash carries intermittent snow melt runoff
during the winter and spring, the stream is generally ephemeral and carries
significant flow only in response to direct precipitation .

..
..

2

5

..:.·; _......:.' 4~~;

;·
;'

I

I

--+- --1

I

22

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..:··

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I J

c-'(

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CATALINA

.,

."

35

FIGURE 1
3 .

CfO~

...
2.3

"'

Principal Flood Problems

Low-lying areas adjacent to the channel are subject to periodic flooding
from floods of lesser magnitude than the 100-year event.

"'

The area

inundated by the 10-year event is not significantly different than the 100year flood plain. Similarly, the area inundated by the 500-year event is

,..

not significantly different than the 100-year flood plain.

Prior to

construction of the bridge at Golder Ranch Road, access across the channel
I"'

was severely limited during and after periods of flooding; the remaining
wash crossings are unimproved, at-grade (dip) crossings.

Another significant flooding problem results from erosion.

...

This was

demonstrated during the flooding of January 1993. Several cross-sections
used in the hydraulic modeling for this study had to be re-surveyed due

...

to channel changes which resulted from that flooding. There are locations
along the study reach where the present location of the primary channel
does not fall within the 100-year flood-prone area as depicted on the
effective FIRMs.
I"'

"'

...

..

2.4

Flood Protection Measures

No major structural flood protection measures exist or are planned by
Pima County. A gun range has constructed earthen embankments north
of Catalina State Park, but these do not provide significant flood
protection .

.
..

4

,.
,..
Pima County constructed the Golder Ranch Road bridge in 1987

,.

(Reference 1) but significant flood protection measures were not
constructed at that time.

3.0

I"

ENGINEERING METHODS

For the flooding sources studied in detail in the community, standard hydraulic
study methods were used to determine the flood hazard data required for this
study. Flood events of a magnitude which are expected to be equaled or exceeded

r
,..

once on the average during any 10-, 50-, 100-, or 500-year period (recurrence
interval) have been selected as having special significance for flood plain
management and for flood insurance rates. These events, commonly termed the

""

10-, 50-, 100-, and 500-year floods, have a 10, 2, 1, and 0.2 percent chance,

,..

respectively, of being equaled or exceeded during any year.

Although the

recurrence interval represents the long term average period between floods of a

,.

specific magnitude, rare floods could occur at short intervals or even within the
same year.

The risk of experiencing a rare flood increases when periods

greater than 1 year are considered. For example, the risk of having a flood
which equals or exceeds the 100-year flood (1 percent chance of annual
exceedence) in any 50-year period is approximately 40 percent (4 in 10),

,..

and, for any 90-year period, the risk increases to approximately 60 percent (6 in
10). The analyses reported herein reflect flooding potentials based on conditions
existing in the community at the time of completion of this study. Just as in the

,.

.
..

case of this LOMR study, maps and flood elevations will be amended periodically
to reflect future changes .

5

I'"

'

3.1

"'

Hydrologic Analyses
No new hydrologic analyses were performed for this study; the hydrologic
data contained herein is identical to that presented in the effective FIS

"'

(Reference 2).

Table 1.

Summary of Discharges

Flooding Source Drainage Area
and Location (Square Miles) 10-Year

Peak Discharges (cfs)
50-Year
100-Year

500-Year

Canada del Oro Wash
Above Confluence
with Sutherland Wash

.
'

3.2

72.9

5,200

12,800

17,500

29,000

Hydraulic Analyses
Analyses of the hydraulic characteristics of flooding from the riverine

..

source studied were carried out to provide estimates of the elevations of

'

...

floods of the selected recurrence intervals .

Cross-section data for the backwater analyses were obtained from
topographic maps compiled from aerial photographs (Reference 3) and
supplemented by field survey. The elevation data and structural geometry

...
...

for the Golder Ranch Road bridge was verified with the bridge
construction plans .

...

..

6

,.
!

Locations of selected cross sections used in the hydraulic analyses are
shown on the Flood Profiles (Exhibit 1). For stream segments for which
a floodway was computed (Section 4.2), selected cross-section locations
are also shown on the LOMR Work Map (Exhibit 2).

Water-surface elevations of floods of the selected recurrence intervals were

,.

computed using the COE HEC-2 step-backwater computer program
(Reference 4). Starting water-surface elevations were determined using

,..

the slope-area method.

,.
Channel and overbank roughness factors (Manning's "n") used in the

I"'

hydraulic computations were chosen by engineering judgement and were
based on field observations of the stream and flood plain areas.

The

channel "n" values ranged from 0.030 to 0.036 and the overbank "n"
values ranged from 0.032 to 0.1.

The hydraulic analyses for this study were based on unobstructed flow.

r

The flood elevations shown on the profiles are thus considered valid only
if hydraulic structures remain unobstructed, operate properly, and do not
fail.

'"'

Many computed flood flow velocities were high because of fairly steep
channel slopes and the low roughness coefficients. In some reaches, the

!"'

velocities were high and the computed depths were low.
7

This flow

ocn_

r
r
condition is hydraulically classified as supercritical. Supercritical flows

!"

have inherently unstable flow elevations.

Small changes in channel

geometry or other hydraulic conditions may cause the flow to abruptly

!"

change (through a hydraulic jump) to subcritical flow, with lower

""

velocities and greater depths (equal energy). Flood elevations at cross

...

sections where supercritical flow was indicated were adjusted to the
corresponding elevations for critical flow.

All elevations are referenced to the National Geodetic Vertical Datum of
1929 (NGVD).

4.0

FLOOD PLAIN MANAGEMENT APPLICATIONS

The NFIP encourages State and local governments to adopt sound flood plain

,..

management programs. Therefore, each Flood Insurance Study produces maps
designed to assist communities in developing flood plain management measures.

4.1

Flood Boundaries
To provide a national standard without regional discrimination, the 1
percent annual chance (100-year) flood has been adopted by FEMA as the
base flood for flood plain management purposes. The 0. 2 percent annual
chance (500-year) flood is employed to indicate additional areas of flood
risk in the community. The 100- and 500-year flood plain boundaries have
been delineated using the flood elevations determined at each cross section.
Between cross sections, the boundaries were interpolated using topographic

,..

maps at scale of 1:2400 with contour intervals of 2 feet (Reference 3).

8

""
4.2

""

""

Floodways
Encroachment on flood plains, such as structures and fill, reduces
flood-carrying capacity, increases flood heights and velocities, and
increases flood hazards in areas beyond the encroachment itself.

One

aspect of flood plain management involves balancing the economic gain
I"'

from flood plain development against the resulting increase in flood
hazard.

For purposes of the National Flood Insurance Program, a

floodway is used as a tool to assist local communities in this aspect of

,.
I"'

flood plain management. Under this concept, the area of the 100-year
flood plain is divided into a floodway and a floodway fringe.

The

floodway is the channel of a stream, plus any adjacent flood plain
areas, that must be kept free of encroachment so that the 100-year

,.

flood can be carried without substantial increases in flood heights.
Minimum federal standards limit such increases to 1. 0 foot, provided
that hazardous velocities are not produced. The floodway in this study

,..

is presented to local agencies as minimum standards that can be adopted
directly or that can be used as a basis for additional floodway studies.

I"'

,.

The floodway presented in this study was computed for certain stream
segments on the basis of equal conveyance reduction from each side

..

of the flood plain. HEC-2 encroachment method 4 was used to set the

...

flood way boundary. Floodway widths were computed at cross sections .

""

initial floodway; method 1 was then used to set the stations for the

9

r
I"'

,.
I"'

Between cross sections, the floodway boundaries were interpolated.
The results of the floodway computations are tabulated for selected
cross sections (Table 2). In cases where the floodway and 100-year
flood plain boundaries are either close together or collinear, only the
floodway boundary is shown.

The area between the floodway and 100-year flood plain boundaries is

,.

termed the floodway fringe. The floodway fringe encompasses the portion
of the flood plain that could be completely obstructed without increasing
the water-surface elevation of the 100-year flood by more than 1.0 foot at

,..

,.

any point. Typical relationships between the floodway and the floodway
fringe and their significance to flood plain development are shown in
Figure 3.

I"'

r

r

,.

,.
,.
!""
I

10

et-lS

~------------ 1 00· YEAA F LOOO "LAIN

FLOOOWAY

------------+ol

------+-•

f'LOOOWAY
F AI NC E

STAEAM
CHANNEL

FLOOO ElEVATION WHEN
CONFINED WITHIN FLOOOWA.Y

A.AEA Of' FLOOC "LA IN TM.&T COULO
IE USEO FOA OEIIE... O,.MENT IY
"A.ISINC GROUND
LINE A.B IS THE FLOOO ELfVATION IEFOAE £NCAOA.CHMENT ..
LINE CO IS THE FLOOO ELEVATION A.FTEA ENCROACHMENT.
•SUACHAAGE IS NOT TO EXCEED 1..0 FOOT (FEMA AEOUIAEMENT) OA LESSEA AMOUNT IF SP'ECIFIEO BY STATE .

Figure 2.

Floodway Schematic

11

r

'

""
P"'

FLOODWAY DATA,
CROSSSECTION

-------

WIDTH
(FT)

CANADA DEL ORO

FLOODWAY ------SECTION
MEAN
AREA
VELOCITY
(SQ. FT.)
(FPS)

WATER SURFACE ELEVATION
WITH
WITHOUT DIFFERENCE
FLOODWAY FLOODWAY
(FT)
(FEET NGVD)

!""

r'
!""

r

.
P"'
P"'

!""

I

!""

P"'

.

DJ
DK
DL
DM
ON
DO
DP
DQ
DR
DS
DT
DU
DV

ow
ox

14.300

DY
DZ
EA

EB
EC
ED
EE
EF
EG
EH
EI
EJ
EK
EL
EM
EN
EO
EP
EQ
ER
ES
ET
EU
EV
EW
EX
EY

693.
691.
560.
398.
490.
591.
458.
528.
439.
498.
584.
577.
590.
538.
485.
463.
464.
403.
558.
518.
625.
525.
528.
372.
421.
512.
424.
506.
538.
611.
660.
758.
615.
415.
445.
437.
448.
587.
632.
625.
498.
430.
368.

2466.
2228.
2069.
1804.
1906.
2749.
1770.
2255.
1701.
1728.
2148.
1975.
2196.
1939.
1975.
2113.
2401.
1779.
2012.
1937.
2169.
1932.
1921.
1730.
2113.
2000.
1786.
2120.
2178.
2264.
2337.
2796.
1933.
1659.
2069.
1881.
2064.
2193.
2348.
2896.
2030.
2070.
1779.

7.1
7.9
8.5
9.7
9.2
6.4
9.9
7.8
10.3
10.1
8.1
8.9
8.0
9.0
8.9
8.3
7.3
9.8
8.7
9.0
8.1
9.1
9.1
10.1
8.3
8.7
9.8
8.3
8.0
7.7
7.5
6.3
9.1
10.5
8.5
9.3
8.5
8.0
7.5
6.0
8.6
8.5
9.8

2884.5
2890.7
2898.6
2907.1
2910.3
2913.8
2920.0
2927.2
2932.3
2937.7
2944.2
2948.3
2954.9
2960.4
2965.2
2966.3
2966.9
2967.8
2972.8
2975.7
2981.9
2986.6
2993.0
3001.8
3008.5
3011.4
3015.0
3023.8
3028.0
3031.8
3034.7
3037.9
3 041.9
3046.4
3052.5
3058.0
3063.7
3070.1
3078.4
3085.2
3089.9
3095.1
3100.8

2883.5
2889.7
2897.6
2906.2
2909.7
2912.9
2919.5
2926.2
2932.1
2937.2
2943.2
2947.8
2953.9
2960.3
2965.2
2966.3
2966.9
2967.2
2972.1
2974.8
2980.9
2985.7
2992.0
3001.2
3007.6
3010.5
3014.1
3022.8
3027.1
3030.8
3033.8
3036.9
3040.9
3045.6
3051.5
3057.0
3062.7
3069.3
3077.6
3084.2
3089.1
3094.2
3099.8

1.0
1.0
1.0
.9
.6
0.9
•5
1.0
.2
•5
1.0
.5
1.0
.3
.0

.o

•0
.6
.7
•9
1.0
.9
1.0
.6
1.0
.9
.9
1.0
.9
1.0
.9
1.0
1.0
•8
1.0
1.0
1.0
.8
.8
1.0
.8
.9
1.0

..

.

12

CAr

,..

5.0

INSURANCE APPLICATION
For flood insurance rating purposes, flood insurance zone designations are

,..

assigned to a community based on the results of the engineering analyses. The
zones shown on the work maps are as follows:

.

Zone AE:
Zone AE is the flood insurance rate zone that corresponds to the 100-year
flood plains that are determined by detailed methods. In most instances,

.

whole-foot base flood elevations derived from the detailed hydraulic
analyses are shown at selected intervals within this zone.
Zone X
Zone X is the flood insurance rate zone that corresponds to areas outside

"'

.

the 500-year flood plain, areas within the 500-year flood plain, areas of
100-year flooding where average depths are less than 1 foot, areas of 100year flooding where the contributing drainage area is less than 1 square

""

.

mile, and areas protected from the 100-year flood by levees. No base
flood elevations or depths are shown within this zone .

,..
,..

.
..

13

...
6.0

"'

LETTER OF MAP REVISION WORK MAP
Letter of Map Revision Work Map is designed for flood insurance map

"'

preparation and flood plain management applications.

.

For flood insurance map preparation, the map designates flood insurance rate
zones as described in Section 5.0 and, in the 100-year flood plains that were
studied by detailed methods, shows selected whole-foot base flood elevations or

"'

average depths.

For flood plain management applications, the map shows by tints, screens, and

"'

symbols, the 100-and 500-year flood plains, the floodways, and the locations of

"'

.
..
!""'

selected cross sections used in the hydraulic analyses and flood way computations.

7.0

OTHER STUDIES
The flood plain and flood way boundaries at the limits of study do not match those
shown on the effective FIRMs because:
A.

.
,..

Flows occurring since the preparation of the effective PIS have changed
the shape and location of the primary channel and the geologic floodplain
and

B.

The resolution of the mapping prepared for this study (1 :2400) is greater
than that (1:4800) used for preparation of the effective FIRMs .

..
..

14

..
8.0

"'

LOCATION OF DATA

Information concerning the pertinent data used in the preparation of this study can
be obtained by contacting the Flood Control Planning Section, Pima County

"'

Department of Transportation and Flood Control District, 201 North Stone
Avenue, Tucson, AZ 85701.

"'

9.0

BffiLIOGRAPHY AND REFERENCES

1.

Pima County Department of Transportation and Flood Control District,

!""

Construction Plans for "Golder Ranch Road Bridge, Project No.

"'

4BACS3", September 1986.
2.

,..

County. Arizona (Unincorporated Areas), September 30, 1992.
3.

Cooper Aerial Survey Company, Topographic Maps, Scale 1:2400,
Contour Interval 2 feet, May 1992.

!""

4.
!""

Federal Emergency Mangement Agency, Flood Insurance Study. Pima

U.S. Department of the Army, Corps of Engineers, Hydrologic
Engineering Center, HEC-2 Water-Surface Profiles. Generalized Computer
Program, Davis, California, May 1992 .

.
,..

.

15

""'

""'

""'

..
""'

.

APPENDIX

""'

...

..

..
.
..

\0(

,

1

,

-,

...

...

-,

'1

...

1

1

,

...

1

1

'1

1

'1

2960
/

~

2950 t--

LEGEND

f-t----

500 YEAR Fl.OOD

t--

2940

f--

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- - 5 0 Y£AR F'LOOO
_./,

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STR£AM BED

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CROSS SECTlON

LOCAnON

. / [::',;.'---

f=
~ 2900

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• DAVIS, CAL FGRNIA 95616-4617
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I • RUN DATE
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Run Date: 270CT94

Run Ti11e: 16:37:23

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THIS RUN EXECUTED 270C T94

iiiiiiiiiiiiiiiiiiiiiiiiiiiiitiiiiiii

16:37:23

HEC-2 W
ATER SURFACE PROFILES
Version

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UPPER CANADA DEL ORO FLOOD INSURANCE SiUDi
CATAL INA STATE PARK BOUNDARY TO PINAL COUNTY LINE
CANADA DEL ORO
CONSULTANT: DAVID EVANS &ASSOCIATES, INC
DEA JOB NO. PCDT001 0
3845 N. BUSINESS CENTER DRI VE
PHONE : (602) 292-2160
TUCSON, AZ 85705
FAX: t602) 292-9i:>1
DAVID EVANS &ASSOCIAT ES PROJECT MANAGER: M
ATT FLICK
CLIENT: PIMA COUNTYDEPT. OF TRANS. &FLOOD CONTROL DISTRICT
201 N. STONE AVENUE
ACTIVITY # 4FUCDO
TUCSON, AZ 85701
PHONE: t602 ) 740-6350
PIHA COUN TY FLOOD CONTROL DI STRICT PROJECT MANAGER: STEVE CASILLAS

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GR 3028.3
480.3
3027.7
GR 3026 .7
649. 7
3028.0
732.4
3027.9
GR 3029 .4
GR 3029. 0
825. 0
3028.5
3026 .9
GR 3027. 1
972.2
GR 3042.6
10S5.3
ttttt CROSS-SECTION 25.1 ADDED FOR
X1
GR
GR

tUU

NH
NH
X1
GR

GR

GR

GR
GR

NH
NH
Xl
GR
GR
GR
GR
GR
GR

EH

303.4
42. 8
179.5
~45.9

294. 7
365 .2
505.2
662.2
748.3
846 .2
992 .9

HHVersion: 6.60

510
3030 .6
3028.3
3028 .6
3027 .6
3028. 3
3027 .5
3027.5
3027 .8
3028 .2
3026 .5

Data File:

MULTPROF .HC2

Page

500
107.9
202.4
260.9
303.4
3~8 .1
519.6
6i7 .3
763 .0
880.2
1039.4

510
3028.5
3021.5
3028.2
3028.1
3028 .0
3026.8
3027.9
3026 .3
3027.9
3026. 2

.042

t>SO

. 03~

me

.vs~

130
j55
570
1100

3032
3o:s

220

950

400
J0:i2
J026.3
303i . 5
3031.1

3032

3032

b50
1220

.042

785 .6

.036

1272 .5

.052

a;

3038
3030.6
3035.5
3033.8
3033 .3
3033 .7

16
146 .5
245. 7
326 .7
416.7
499 .5
602.4
67S.1
765 .6
879.7
lv32 .2
1164 6

137 .a
212 .2
274.0
321.3
436 .9
581.8
701. 4
775 .'i.
918.1
1052 .0

3026.2
3028.6
3024.9
3028.1
3028.5
3028.8
3028.3
3028.0
3027 .s
3026. 2

10

148.5
222. 3
279.5
332 .4
45& .0
51~ . 3

722 .6
ol4. i
942 .9
i057 .o

COMPUTATIONAL STABILiT Y

tUU

5

.050

31 5

.035

365

315
3040
3030
303i

----*34-

23
0.0
2SO
440
760
1290

:.i65
40
315
462
640
131:0

360
j034
302b .3
j032
3031

1350
25. 1
3050
3031
3031.8
3031.5
t nn=ttrnut

~032

3044

305~

5
.065
122.1
.032
157.2
1419 .7
11:2 .;
4''0
26
o8
157 .2
3046
40
3044
65
3042
3037. 1
100 .0
3033 .5
109.1
3033 .4
3035 .1
157 .2
3034.9
176.4
3035 .5
3035 .2
261.9
3034.6
263.7
3034.2
3033 .6
343.3
3034.2
370 .1
3034.2
449. 4
3034.1
434. 2
3033.5
3033 .4
GR 3033.8
513.6
3033.7
538 .6
3034.4
GR 3033. 1
623.2
3033 .6
64 0.2
30~·3 2
701. j
GR 3031.2
695 .5
3031.0
30J4.5
GR 3035.3
785.6
3035.6
802.3
3035 .0
GR 303 ~ . 7
911 .7
3034. 6
951 .5
303 ~. 5
Gli 3033. 3
1046. 9
3033. 3
1098.3
3034.6
30J.; ,.,)
G~
3033 .7
1205.9
3033 .8
i 2Si .5
GR 3038.0
137S .1
3039 .6
1415.0
3040 . ~
tfttt DIKE (WEST OF CHANN
EL, CROSS-SECTIONS 27-29 1
tttt; NOT CONSIDEiiED AS RE GULA JO~ Y LEVEE
t lttt EFFECTIVE FLOW A~EA NOJ ~~~UL~D
uxu EO tuu
I

\.I

0

43C
.;s
:Jj5
~05

i~SC

460
/C

1£2.9
197.2
304.7
339 .9
.il, 5.0
551.1
o52 .0

71& .0
816 .9
983 .0
1122.1

1272 .~

W9. 7

470

30 ~ ~

3030. 7
3035 .3
3033 .4
3033.3
3034.0
3034. 8
3034.2
303 4.6
3034. 9
3034.4
3033 .9
3035.3

134. 3
220. 7
314. 9
404.1
475.9
579 .0
663 .1
741.2
834. 3
10lb .4
1131. 9
1300 9
0

303~ . 3

3033 .3
3035 .5
3034.7
3034 .4
3033.8
3036.;

3b~

0

m~ .

s

) } (0

r

.
l

,.

Run Date: 270Ci94

Run Time: 16:37:23

h~\'JefSlOI,:

.052
. 044
.032
41 (1
27
54
~09 .1
07~
. GR 3054.0
0.0
3050.0
43.3
3047.7
r GR 3040 .7
240.;
212.5
3040.0
3039 .i
GR 3037.6
Jc~~o.c.
284 .1
3037.2
290.&
GR 3039.1
337.6
3037.4
345 .7
30J I . G
402. ·;
392.8
3037.0
~8~1.1
I'" GR 3036.4
478.5
3038.3
487. 7
3C39.l
r GR 3039.6
GR 3039.4
3039.3
556.8
5&5.0
o03i.O
GR 3038.8
3038.2
OL1,..;
3038.4
789.1
GR 3038.8
3038.9
1094.2
1053.8
3038.8
3038.1
1237.2
1210.6
303&.2
GR 3038.2
GR 3038.7
3039.7
3041.0
1362.1
1372.5
:tit:U DIKE (WEST Of CHANNel, CROSS-SECTIONS Z>27)
UU:t NOT CONSIDERED AS "GULATORY LEVEE
tUU EFFECTIVE FLO~ AREh NOT REDUCED
UUt DIKE (WEST OF CHANNEL, CROSS-SECi!ONS 27-29)
UUt NOT CONSIDERED AS REGULATORY LEVEE
uut EFFECTIVE FLOW AREA NOT REDUCED
UUt EP tttU

o.60

Pagt

liUL if kOF. HC2

Data f ilt::

11

NC

I'" X1

~

·J

.,

r

,.

r NH

NH
X1
I'" GR
! GR
GR
GR
GR
r" GR
GR
GR
GR
GR
GR

r

,.

5
207.8
.042
. OS
1174.9
18
53
415.6
588. i
3054.0
0.0
3052.6
35.5
3044.4
179.1
304'-7
192 't.
3043.9
3043.5
250. ~~
131.5
3043.6
3043.4
41 :, . 6
391.7
3041. 4
485.9
3041.2
506. i
3040.6
3044.1
579.9
588.7
3043.1
661.8
3042.8
695.1
3042.8
836.4
3043.0
885.5
3044.3
972.7
3044.2
9%.2
3047.2
3048.0
1123.0
1148.4
3051.0
3053.6
1124.2
124 3.8
tUU OIKE (WEST Of CHANNEL, "0 S-SECiiONS
UUt NOI CONSIDERED AS REGULA TO y LEVee
U:Ut EFFECTIVE fLOW AREA "Oi Rl U~lD
tUU EO .tUU

NC
X1
GR
GR
1
GR
GR
r"
GR
. GR
GR

r

"GR

I"" GF

Gh

.050

.0\4

)062.0
3050.0
3048.8
3049.0
3048.7

0.0
224.3
320 .b
407 .6
482.9

29

3046.7

3045.9
3047.4
3049.3
305 7 '2
~057

.4

59

SiC .8

&74.3
778.1
893 .1
i 037 .1
1158.<

590
76.7
250.0
20 j.'
357 .J
410.0
504.0
630.5
88U
1120.3
1266.3
1364.5

670

3044.4

3031.~

3040.1
3036.~

3038.2
3049.4

560. 7

.040

303j.C
3038.9
J031.0
3038.2

.032

3%
JJ50.9

7~.7

3046.1

205.6
2.77 .4

~040.7

304~:·

4

:.oc ,;;
~:.·4:.

J04~'

7

''1

jlj~ t>.

2

30~2.2
A'' '

'

jiJ't.J.~

3044.7
3046.-7
:ve>L. 4
~7-LS ./

4j/ .4

)24 '4
b 13.5

721.L

920.6
1016 ·'
1167. 4
1i74.i

302.S

421.1
516.5
666.2
942. i
1165.9
1304.4
1403.7

30Jj,j

4~ :. 's

450

119.6
25&.7
3!9.8

3040.

303'1.

.1"i

302S.

"23

JVJ9.
3039.
3038.

53

2~2-v.

303;.

30)8.
303o.

/6\.0

,/

.

.~

]6 ·'
.0
4~

.b

;o

98 'i
110 .6
l32

'

.G44

~)0

J04J.J
~.(,4V. 7
J04i.3
304t.. 6

103.0

207.&
311. to

450.4

535.0

304l.5
3043.8
3C45. l

621.6
7b9 .0
l3) .0
1050.0

7

lbb .b

~-b0.

30\o.~

304c.:
304:.. .;

3040. i
304 i . 0
3043.1

l40 '7
'1'

'

,;.~0.1

~54 '7

476. 1
551. ~
v..)6.8

3042.6
3045.0
3046.2
305i.O

802.0
953.6

i 090 .1
l =~c.:.

J ~; . t

~;J

.>))5
b~ ~.. 7

b

3050.0
304 9. 4
3041 'i
3048.8
30~ 7 . b
~·04) ''j

bo(

4c

:•'·'-

.;.0 ~ .o

:•.:. , I

304

.0

:· '~
, ..

304 .

;:, i;,,

30o0.L

':•
J

)Vi! 1 . 't

:

4

}i,J~ ~ '

'IL)

.i04

~I . ~
~ ~. 7

: 01

:·

.::::.~ (·.
j'j~-: .

8'

~G ~t'.

~ 0.6

3042.

"-

J

:·'.)~. -~

~ .1.

?C<I .S
3G.;·;. 5
JOSS. 4

~0

: \,' :.:- .

- (. )6 . ~

._

"~ l '

.

~

..

.IJ

2

'~·

~·~

o.;

04
.js

,;s

'

4.
o.

..

'.

.
'i..

. 4'1 . i
'

4&.c

.,

.1

',,

i :.. 4

.) :· .

b~.2

'

0~ .

,,

6.

j

J

'·; .

)

'

: .~

5.

il',.

0.

;:,,l

b.

v''.)

,.

,.
""

...

\11

,..
,..

,..

Run Date:
GR

3065.6
UUt

,..

UtU

UtU
UUt

NH

..,X1
!

GR

GR
GR
GR
,.. GR
GR
GR
GR
GR
GR
GR
GR
GR
GR
GR

,..
,..

NH

X1
GR
GR
GR

"" GRGR

.
,..

,.

GR

G'GR
GR
GR
GR
GR
GR
GR
GR

X1
GR

GR

"" GR
GR:

,. GR

Gf,
GF,

3066.3

d'i\lersio1-1:

uo

Data Filc:

Page

MULl PROf .HC2

30,6.4

1,5(· '~

3.Jb .8

1605.4

.002
725.2
28.1

725.2
560
;o6J.a

9~6.9

.054

17'-0.1

~ 42

305 5. 4

471 . 0
616. 2
683.4

118.4
2S2 .l
349.6
486.2
643.0
693.3
104.9
683.9

30S7 .1

'l2 . :

~-052 '~

.041
675
82.0

150~.0

12

NOT CONSIDERED AS REGULATORY LEVEE
EFFECTIVE FLOW AREA NOT REDUCED
ER UUt

ES

ET

.050
0.0
191.3
284.0
402.2
548.5
664.3
718.8
804.7
906.0
998.9
ll07 .0
!2;1.3
1361.7
1526.4
1673.5

675.2
675.2
3069.1
3054.7
3054.8
3054.2
3054.8
3051.8
3052.2
3053.1
3053.7
3052.9
3054.9
3056.2
3057.1
3060.3
307l.L

.056
.037

40 l . 0

620.7

73

73

0.0

17\.6

385.8
480.9
599.7
682.0
771.5
651.7

1010.8
1166.5
1290.7
1607.9
1844.9
1%3.8

2037.3
.057

32

66
0.0
124. 4

3080.0
3078.9
3075.8
3068.9
306 7. 0
j0b6.4

92!. 7
lOla. i

1125.3
1281.5
139L
1565.7
1713. 2

3051.\
3054.5
3049.8
3050.7

30St..~
305~.6

Jl,SS. &

3G~·S.O

74,.8
OJ:·. 0
;~L,

,j

103 J.. l
lb~.4

Jj55. i

1201.;

3057.1

14J0.2

305~.~

3054.0

305U
3054.4
3050. i
3054.6
305\.i
~05~.8
~:Ot.~-. 3

3055.5

3072,j

1720.i

ic.Oc.7

3056.1
=-056 .0
}061 .c

.C~c

451 . ~~

. C•S0

.042

206~.:

v4l . 7

3061.1

'94). 8

1057.1
ll84. 9
1217.9
1454.8

0 .4
6 .o
7
., .5.0

JUS~.~

3054.7

.•

3054 .l

3054.4

5 .0

305i.3

0
6

~055.~
,;.vS~·. 0
~054. 4

3056.0

'
·'
.&

.7

.5

8 .7
1 •7

1

JOOS.b

i .4
6 .4

3050.:1
J05~.1

1636.2

3060. /'

.032

7V2.9

. 051

..

30o 1. ~

i.u .0

'

.'

641.;
3078.:
306b .1
3060.9
3061.0
3059.6
30\8.7
3059.7
3002.0
3060 . '
3062.C
306 l. 7
3006. i

3072.2
307:.s
J08l.6

;·o2. 9
22 . 0
212.1

U~i.

LJ7',",

=··'-

30/ ~ .

3Cc3. '1

:·' ' )
,64 . ~

40 l . 0

3051 .C

420 '~

30)9.7

541.9
bl5.7
702.i

7j 1. s

j('

3061.L
30t0' 7

'.i060 .1

56d
626.5

ll ~. ~

c,.~ G

306~.l

30S8,j
3060.1
i0S9.8

3%0 .l
30~-7 .&

310. ·;

JO) 1. 4

; 41. j

1190. 4

3060.4
3061.5

1415.1

306l. 5

1084.2
1216. 7
i. 47~ . 2

3057.5

914.1
1045.7

1657.3

3063.8

1717 .z

lt-62.4
l%c .6

3072.1
:,:,)/ ~- -~

20/~.:-

~-002 .0

~06~ -~

4. 8

835
; -~-C 0 .l

I' ~l
4J

l~-b~

.0
1S6C'.4

3060.9

3061.5
3062.6
3069.'
307 4. i

?-0 ~ :.. !

~)

307 . 7
439 . 3

573.5
641.;
751 . j
820.7
967.9
:140.6
l236.b
1122.6
1775.7
1'115.5
2002.2

30o1. 2
J06i.O
cOS£.4
JOSH

jQ\6.2
30&0.<

~~b.t.
~

5;· ';

586.9
664.6
767.6
HS.2

3058.4

002.~

i062. 9

152 . 0
2d.t556 .1

3059.2
3063.8
3070.4

307~.j
30?~·.0

796 .1
1.52.4
Ol9.5

':U:h

.060

3066. ~-

~i2.1

435.8
585.0
675.2
725.2
844.1

.1
334.5

620
3059.:

:txiU

7
767.6
31
3080.0
3066.7
3060.3
3061.0
3059.6
3055.3
3056.2
3060.5
3060.0
3062.1
3063.4
3065.3
3071.6
3072.5
3077.4
UU*

NC

1464.4

Run Ttme: 16:37:23

DiKE (WEST OF CHANNEL)

4
30
3071.1
3054.7
3054.6
3053.6
3054.3
3052.0
3051.4
3054.1
3054.0
3054.1
3055.8
3055.9
3056.2
3059.8
3062.1
UU:t

rNH

270CTJ4

243.2
42J. 5

517.4

614 . 8

747. 7

.03b
517.4

060.0
~; 71.6
07~ '3
ou .2
06~.4

Cc .J6t.)

·'

:,

b ..,
~

'

s' i
0. i

:v _;·;. ~

JJ~.:

:- ~. ..

.:·-'

)

.

(

.

5~ 5

307";,:)
_i07b

:.o 7~ .

4

~ • I)

Joo:

·~ ~;

Jlj6~

0

c '5

.;.Gv.

-~'-~:

'. '

' -·~ .

..,

; ·.'0C·.
_,;.:,

"'0.

lh.
25~.

4' ~·.

307
307

307

1 v~ . 1

i (1·;. -::
:: b~ . ;)

30u

-''-'•• • I

:,:J-

J•J ~:.

·.·•

• [• I-}'

~0t.

( .. )

..

3D.-)

.~;

·'
..

,.

.
!""

I I'3

,...

Run Date:

"" GR
GR
,... GR
, GR
GR
GR
GR

I"'

27DC194

Data fik

Run Time: 16:J7:2i

3066.4
i1U
30b6.7
~Vt.t . :
92/.
3066.8
1058.6
J066.7
i.l2 ~ .
J•Jl.JI 'i.
~ i)bb .I
3066.2
1254.1
3066.4
1300.
3065.9
1397.1
3066.1
3072.4
1431'
3072.5
1549.4
3073.1
1~0 7 •
307J.4
3073.0
1633.3
3075.5
307o.2
16 7l '
3080.1
1817.7
""' CR055-5ECTiOI< 33 HAS BElli MGD!f ilc 10 hel .CC i
"'" CR055-SECi!ON TO BEiTER MODEL fLvW P;iiE.•,r;,
tUU EU iU:U

,.. NC
XI
GR
GR
GR
,... GR
GR
GR
GR
GR

i .;

..:G ~-. t<
JO 7 . 2

'J. ~·

30 6.4

0.

i

c

;o 2.2

:i6.v

JQ 0 .l

.065
.057
.036
33
40
445.3
4oo.6
o\0
),0
3090.2
C.O
3087.1
4j.4
3003.5
ll:.. c
3077.3
i33.5
3076.6
:su
:075.9
21•.9
3071.6
321.4
3073.1
33U
'07:.8
.;o.v
3074.7
o9H
3073.\
404.3
J:j::.. i
;>.C
3070.5
467.5
3073.9
488.6
30/U
SL0
3076.5
875
3076
920
3074
i70
3076
1320
3078
1335
30o0
l3bS
3080
1470
3082
15:;
3084
1610
CROS5-SECi!OII 34 HAS BEEN 110D!f leG iO SCFLECT THE REHLIGI111EH; OF
mu CROS5-SECi!ON TO BETTER MODEL FL0w PAiiEf.N:.
iUU: EV t:r.t::U

Xl
"
,_ GR
· GR
GR
GR
GR
,... GR
GR
GR

5
1585
34
3093.4
3081.3
3082.4
3077.4
3081.2
3080.9
3080
3082.6
3084

*****

Xl
,. GR
' GR
GR
GR
,... GR
, GR
GR
Gh
GR
,.. I~K

.052
35
3096.0
3085.6
3084.8
3085.6
3085.2
3086.1
3084. 4
3082
308·) . :.
3010
atitJ

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""
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1
2
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4.5
5

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LETTER
DJ

DK
DL
DM
DN
DO
DP
DQ
DR
DS
DT
DU
DV
DW
DX
DY
DZ
EA
EB
EC
ED
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EI

COMMENTS
Limit of Study

Wilds Road

Golder Ranch Road Bridge

EJ

EK
EL
EM
EN
EO
EP
EQ
ER
ES
ET
EU
EV
EW
EX
EY

Edwin Road
Pima-Pinal County Line
Limit of Study

n

r
""' HEC2 S/N: 1353000090

HHVersion: 6.60

Data File: FLOOOWY1.HC2

p-tttttttttttttttttttttttttttttttttttttttttttt

:*
**

HEC-2 WATER SURFACE PROFILES
Version

4.6.2; Hay 1991

***************************************

*
•*
**

' U.S. ARMY CORPS OF ENGINEERS
' HYDROLOGIC ENGINEERING CENTER
* 609 SECOND STREET, SUITE 0
* DAVIS, CALIFORNIA 95616-4687
*
(916 J 756-1104

r"** RUN DATE 270CT94 TIME 16:25:59
********************************************

X xxxxxxx XX XXX
X X
X
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X
X X
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xxxxxxx xxxx
X
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....' .' '......................
' ' ..
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........ ........ ' ......
..............................................
..............................................
'
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FULL MICRO-COMPUTER IMPLEMENTATION
. " .........
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.........
, .......... ' ' ' .......... ' ......... ' ' .
.' ...........
. ...........................................
.
' ' ' " ... ' . " " ... ' . ' .. " .. ' .. ' ' .. .

""

HAE S T A0 HE T H0 0 S
=============================
37 Brookside Road * Waterbury, Connecticut 06708

Ft-OOOW"-<Y

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*
*

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***************************************

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*

*

(203) 755-1666

Run Date: 270CT94

Run Ti1e: 16:26:00

HHVersion: 6.60

Data File:

FLOODWY1.HC2

Page

THIS RUN EXECUTED 270CT94

ttttttttttttttttttttttttttttttttttttt
HEC-2 WATER SURFACE PROFILES
Version 4.6.2; Hay 1991
ttttttttttttttttttttttttttttttttttttt
T1
UPPER CANADA DEL ORO FLOOD INSURANCE STUDY -- FLOODWAY (UNENCROACHED )
T2
CATALINA STATE PARK BOUNDARY TO PINAL COUNTY LINE
T3
CANADA DEL ORO
T4
CONSULTANT: DAV IDEVANS &ASSOCIATES, INC
DEA JOB NO. PCDT0010
T5
3845 N. BUSINESS CENTER DRIVE
PHONE: (602) 292-2160
T6
TUCSON, AZ 85705
FAX: (602) 292-9131
16
DAVID EVANS &ASSOCIATES PROJECT HANAGER: HATT FLICK
T7
CLIENT: PIHA COUNTY DEPT. OF TRANS. &FLOOD CONTROL DISTRICT
T8
201 N. STONE AVENUE
ACTIVITY I 4FUCDO
T9
TUCSON, AZ 85701
PHONE: (602) 740-6350
T9
PIHA COUNTY FLOOD CONTROL DISTRICT PROJECT HANAGER: STEVE CASILLAS
T9tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
T9ttttt 100-YEAR ANALYSIS - 0100=17500 CFS - STARTING WSE = 2883 .5
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1464.8

16:26:00

r
""
Run Date: 270CT94

Run Tiae: 16=26:00

HMYersion: 6.60

Data File:

FLOODWY1.HC2

Page

2

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2880.0
229.8
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295.7
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406.8
2878.9
538.5
2879.3
609.5
2881.3
659.7
1881.4
724.1
1882.4
825.6
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1880.4
1015.9
2880.8
1171.7
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1171.7
1314.5
2887.1
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316.1
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441.8
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545.7
2880.6
617.4
1877.9
665.8
2882.6
743.5
2880.4
832.1
2881.7
908.4
2880.4
1029.0
2880.2
1223.4
2881.3
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RANGE EMBANKMENTS

tUU

7.1
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.03
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2
57
887.2
1001.4
2893.2
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2886.4
11.0
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56.8
2886.1
71.7
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110.0
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132.4
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232.3
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286.0
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439.0
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468.4
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574.4
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587.3
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645.0
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710.5
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780.5
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923.5
2886.9
933.8
2887.3
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tUU UPSTREAM OF GUN RANGE EMBANKMENTS U::Ut
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2903.8
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2883.0
2881.2
2883.0
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2881.5
2879.5
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2888.3
2888.1
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2887.6
2885.7
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590.7
663.5
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3
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769.6
650
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144.9
211.5
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230.0
2895.4
310.6
359.2
2894.4
387.8
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464.7
496.5
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565.8
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702.7
2892.3
751.0
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2894.2
919.0
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2895.3
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1901.1
1066.2
1095.5
2912.2
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2916.4
1168.6
ttttt CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
*'**'CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT
*'*'*USES WHOLE NUMBER STATIONING)
**'*' OM ttttt

0
2880.3
2883.3
2881.8
2882.7
1881.2
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2880.9
2881 .6
2881.6
2881.6
2881.5
2880.5
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44.4
189.8
261.9
360.4
497.7
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633.4
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310

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570
2886.0
2887.3
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2887.7
2887.9
2884.9
2887.2
2887.1
2885.3
2885.0
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31.0
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172.5
417.8
529.9
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2895.3
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2896.7
2894.3
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2881.4
2882.9
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2882.1
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2879.5
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2881.5
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2882.4
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58.0
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281.6
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797 .8
870.2
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1140.0
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1884.0
2887.2
2887.6
2887.1
1887.7
1886.3
2887.2
1888.8
2885.4
2887.4
2889.8

48.7
103.6
180.9
424.9
567.4
608.8
693.9
835.0
917.0
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1117.5

2894.9
2894.7
1895.5
2895.1
2894.6
2895.0
2896.1
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102.1
288.8
434.3
681.6
781.3
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811
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265.3
407.1
612.6
769.6
883.6
964.8
1149.6

DATA

.
..
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r
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Run Date: 270CT94

Run Time: 16:26:00

HHVersion: 6.60

Data File:

FLOOOWY!.HC2

Page

3

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NC

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2903.8
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2905.1
2904.2
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2905.6
1048.6
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1071.4
2907.5
GR 2905.0
GR 2908.9
1144.6
1179.6
2928.7
1247.1
2915.4
2928.5
***'* CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
***** CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT DATA
***** USES WHOLE NUMBER STATIONING)
CROSS-SECTION 4.5 ADDED FOR COMPUTATIONAL STABILITY BETWEEN SECNOs 4 &5
***** ON UUi
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0.05

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6.5
8
645
7.9
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9.4
995
15.5
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***** CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
***** CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT DATA
um USES WHOLE NUMBER STATIONING)
tUU 00 UtU
5
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2909.3
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2916.5
2914.9
2913.8
2917.0
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194.7
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608.3
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2908.6
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2900.5
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2903.8
2904.3
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2927.9

97.9
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119
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2907.8
2909.7
2908.7
2910.9
2912.0

141
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1119.8

32.4
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246.1
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2915.9
2915.7
2916.8
1918.6
2918.6
2921.0

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2916.7
2916.1
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1099.4

r"

.
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Run Date: 27DCT94

Run Time: 16:26:00

HHVersion: 6.60

Data File:

Page

FLOODWYJ.HC2

P'"
GR

2924.3
1116.4
ROLLINS ROAD
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2926.6
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2924.3
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2923.4
202.1
2923.5
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252.5
2922.9
265.7
311.2
2920.5
2922.5
329.8
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·
IIIII CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
ttttl CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NE~ INPUT
11111 USES WHOLE NUMBER STATIONING)
tUU DRtttU

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399.3
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2928.7
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2927.6
363.4
350.8
2931.2
394.4
2931.2
418.8
2930.8
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2930.3
557.6
2930.3
624.5
588.7
2930.7
2930.6
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tlttt CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
ttltt CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT
ttttt USES WHOLE NUMBER STATIONING)
ltttt TROTTER PLACE I TROTTER ROAD ltltl
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2930.6
2927.4
2930.4
2930.6
2930.4
2931.3
2930.7
2937.9

70
220
311.3
368.7
482.1
670.9
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897.7
975.2
1105.6

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380
59
159
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496.5
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731.6
859.7
952.3
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2934.9
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2932.7
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130.0
215.4
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2920.6
2923.5
2922.4
2923.3
2923.5
2923.0
2925.2
2927.1
2932.4

63.4
152.8
228.3
296.9
359.0
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2927.3
2928.6
2928.6
2930.9
2930.1
2930.7
2930.2
2931.2
2931.8
2940.7

74
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329.4
378.0
520.3
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916.8
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2933.3
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99
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517.8
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1008.3
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DATA

DATA

88
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2933.3
2934.5
2935.5
2933.9
2932.3
2935.5
2934.6
2936.0
2934.8
2936.5
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1303.1

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620
630
2949.6
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2947.8
14.7
2947.5
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2940.5
177
2941.5
188
2942.1
213
2941.2
297.6
2941.0
324.7
2940.5
360.4
2940.1
417.4
2940.5
441.2
2940.5
491.3
2940.3
646.4
2940.5
724.7
2941.0
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2940.7
880.4
2940.9
924.0
2941.3
968.8
2945.8
1!75.9
2951.3
1270.8
ttttt CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
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ttttt USES WHOLE NUMBER STATIONING)
UUi DU **'*'

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Data File:

FLOODWYl. HC2

2948.4
1358.5
2947.2
1362.8
2948.4
1367.4
2948.8
2950.1
1423.3
2951.5
1431.8
ttttt CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
***** CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT DATA
***** USES WHOLE NUMBER STATIONING)
***** WILDS ROAD (WEST OF COO) *****
uut DT uut

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NH

HMVersion: 6.60

tUU

.060
.042
46
0.0
134.4
253.4
363.1
470.6
616.2
808.4
965.9
1049.3
1106.6

1387.6

2949.0

630
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1270.8

61
220.9
369.1
544.8
831.3
1023.0

2939.9
2941 .4
2940.0
2940 .I
2940.7
2943.8

119.0
264.4
379.3
593.0
846.9
1101.0

1404.2

DATA
53.2

630

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Run Date: 270CT94

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Data File:

FLOODWYI.HC2

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Run Time: 16:26:00

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Data file:

FLOODWYI.HC2

II 0
1020
CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
CHANGES WHICH OCCURRED IN THE FLOODING OF JANUARY 1993 (NEW INPUT DATA
USES WHOLE NUMBER STATIONING)
EG *****

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***** CROSS-SECTION GROUND POINTS INCORPORATE SURVEY DATA THAT REFLECT
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*****CROSS-SECTION 22.5 ADDED FOR COMPUTATIONAL STABILITY BETWEEN SECNOs
***** 22 AND 23. GROUND DATA REFLECTS NEW SURVEY DATA OBTAINED
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***** EH *****
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***** CHANGES WHICH OCCURRED IN THE FLOODING Of JANUARY 1993 (NEW INPUT DATA
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***** EI *****
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804.9
3011.5
811.0
301 i.6
830.8
3012.4
877.3
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3012.7
889.2
3013.3
906.9
3013.7
tUU SOUTH END Of A!RSiEIP Uttt
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NC
: XI
GR
GR
GR
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GR
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601
93.1
155
241
349.1
545.0
639.5
718 .1
810.2
875.0

3005.8
3004.6
3004.3
3004 5
3004.1
3005.1
3004 .I
3006.7
3007 .I

116.9
180
265
400.7
563.1
653.8
734 .6
819.6
889.9

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118
270
830
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3.8
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138
370
859
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3007.6
3010.1
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3011.9
3010.6
3011.9
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Run Date: 270CT94

Run Time: 16:26:00

HMVersion: 6.60

Data File:

FLOODWY1.HC2

Page

10

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7.1
6
206.9
.050
576.3
.042
981.6
24
416.8
45
3030.0
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3022.5
3020.9
179.4
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3018.0
276.7
3020.4
3021.0
386.0
3020.3
3020.1
463.3
3020.2
550.2
3019.7
3018.8
3020.1
659.4
3019.8
3019.0
3019.0
828.5
3024.3
3023.2
899.1
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24.1
24
312
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231.9
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283.3
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346.3
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480.3
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3026.7
649.7
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206.9
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291 .5
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416.8
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492.0
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562.4
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696.0
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840.9
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919.4
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COMPUTATIONAL STABILITY

350
35
290
380
620
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303.4
42.8
179.5
245.9
294.7
365.2
505.2
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748.3
846.2
992.9

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3040
3022.6
3023.5
3024
3029

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3028.3
3028.6
3027.8
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101.5
232.6
309.0
425.7
509.8
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937.5

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3017.1
3021.1
3015.9
3020.5
3018.9
3019.6
3023.3
3023.4

126.0
240.0
346.8
442.4
517.2
632.5
764.7
868.0
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3018.0
3020.7
3019.7
3019.3
3020.3
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252.2
369.8
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798.3
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320
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840
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175
338
490
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107.9
202.4
260.9
303.4
398.1
519.6
677.3
763.0
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510
3028.5
3027.5
3028.2
3028 .1
3028.0
3028.8
3027.9
3028.3
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137.8
212.2
274.0
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436.9
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3028.6
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279.5
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599.3
722.6
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COMPUTATIONAL STABILITY

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Run Date: 270CT94

Run Time: 16:26:00

HMVersion: 6.60

Data File:

FLOODWY1.HC2

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26
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157.2
3035.2
261.9
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343.3
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434.2
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513.6
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3031.6
3035.6
3034.6
3033.3
3033.8
3039.6

157.2
65
109.1
176.4
283.7
370 .1
449.4
538.6
640.2
701.9
802.3
951.5
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1251.5
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470
3042
3033.4
3035.5
3034.2
3034.2
3033.4
3034.4
3033.2
3034.5
3035.0
3034.5
3034.6
3034.3
3040.5

480
78
122.9
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304.7
389.9
465.0
559.1
652.0
718.0
818.9
983.0
1122.1
1272.5
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470
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3030.7
3035.3
3033.4
3033.3
3034.0
3034.8
3034.2
3034.6
3034.9
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314.9
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475.9
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3030.6
3035.5
3033.8
3033.3
3033.7
3034.3
3033.3
3035.5
3034.7
3034.4
3033.8
3036.4

96
146.5
245.7
328.7
416 .7
499.5
602.4
679.1
765.8
879.7
1032.2
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305

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3044.4
3039.3
3040.1
3036.5
3039.3
3039.8
3038.9
3039.0
3038.2
3038.2
3049.4

119.6
258.7
319.8
362.5
421.1
516.5
666.2
942.1
1165.9
1304.4
1403.7

3040.7
3039.5
3039.0
3036.5
3039.9
3039.2
3038.9
3039.2
3038.9
3038.4

193 .7
273.2
332. 4
368.8
447.2
533.6
704.9
989.9
1181.6
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390

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568.7

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450
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205.6
277.4
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207.8
311.6
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3046.2
3043.3
3043.6
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40 .7

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NOT CONSIDERED AS REGULATORY LEVEE
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NC
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27
54
309.9
410
675
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3050.0
43.3
3047.7
3040.0
GR 3040 .7
212.5
240.7
3039.1
GR 3037.6
284.1
3037.2
290.8
3040.8
GR 3039.1
337.6
3037.4
345.7
3037 .0
GR 3036.4
392.8
3037.0
402.9
3041.1
GR 3039.6
478.5
3038.3
487.7
3039.1
GR 3039.4
556.8
3039.3
585.0
3039.0
789.1
3038.2
3038.4
829.3
GR 3038.8
GR 3038.8
1053.8
3038.9
1094.2
3038.8
GR 3038.2
1210.6
3038 .1
1237.2
3038.2
3039 .7
GR 3038 .7
1362.1
1372.5
3041.0
:t:UU DIKE (WEST OF CHANNEL, CROSS-SECTIONS 27-29)
UU:t NOT CONSIDERED AS REGULATORY LEVEE
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7.1
(WEST OF CHANNEL, CROSS-SECTIONS 27-29)
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NOT CONSIDERED AS REGULATORY LEVEE
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FLOW AREA NOT REDUCED
NH
5
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207.8
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415. 6
NH 1274.9
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415.6
28
53
588.7
390
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0.0
3052.6
35.5
3050.9
GR 3044.4
179.1
3043.7
192.6
3040.4
231.5
3043.5
250.3
3043.6
GR 3043.9
391 .7
3043.4
GR 3043.6
415.6
3040.7
ET

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590
76.7
250.0
309.9
357.5
410.0
504.0
630.5
887.4
1120.3
1266.3
1384.5

18 .1

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76 '~

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Run Date: 170CT94

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GR
GR
P"' GR
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3041.4
485.9
3040.6
579.9
3043.1
661.8
3041.8
836.4
3044.3
971.7
3047.1
1123.0
3051.0
1224.2
tuu EO "'"

Run Time: 16:16:00
3041.2
3044.1
3041.8
3043.0
3044.2
3048.0
3053.6

506.1
588.7
695.1
885.5
996.2
1148.4
1243.8

HMVersion: 6.60
3040.9
3046.3
3041.2
3043.3
3044. 7
3048.9
3061.4

Data File:
514.4
613.5
729.2
910.6
1016.6
1167.4
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NC
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.035
.054
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29
59
645.7
698.6
590
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3060.1
33.2
305S.2
124.5
3050.0
145 .I
3048.6
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GR 3048.8
320.6
3049.4
330.6
3049.4
GR 3049.0
407.6
3049.1
419.1
3049.1
GR 3048.7
481.9
3048.8
525.1
3048.8
GR 3046 .7
593.8
3047.6
599.7
3046.9
GR 3045.9
674.3
3045.9
690.6
3046.8
GR 3047.4
778.1
3047.8
801.5
3048.4
GR 3049.3
893.1
3049.8
911.2
3050.8
GR 3057.1
1037.1
3055.4
1044.9
3055.7
GR 3057.4
1158.2
3058.5
1200.4
3061.0
GR 3065.6
3066.3
1503.8
3068 .4
1464.4
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4
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675.2
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725.2
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30
73
725.1
560
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3069.1
3063.8
28.1
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GR 3054.7
218.7
199.3
3054.7
3052.9
GR 3054.6
284.0
3054.8
312. 9
3052.5
GR 3053.6
402.2
3054.2
438.8
3054.5
548.5
3054.8
585.0
3055.4
GR 3054.3
664.3
3051.8
675.1
3049.8
GR 3052.0
GR 3051.4
718.8
3052.2
725.2
3050.7
GR 3054 .1
3053.1
844.3
3054.4
804.7
3054.0
906.0
3053.7
921 . 7
3054.6
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GR 3054.1
998.9
3052.9
1018.9
3055.8
1107.0
3054 .9
1125.3
3055.0
GR 3055.8
GR 3055.9
1251.3
3056.2
1281.5
3055.1
GR 3056.2
1361.7
3057.1
1391.7
3057.1
GR 3059.8
1526.4
3060.3
1565.7
3061 .1
GR 3062.1
1673.5
3071.2
1713.2
3072.0
UtU

fLOODWY1.HC1

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3041.3
3048.6
3042.5
3043.8
3045.1
3050.7

535.0
611.6
769.0
937.0
1050.0
1198.6

3041.0
3043.1
3042.6
3045.0
3046.2
3052.0

559.3
638.8
802.0
953 .6
1090.9
1210.5

352

797

640
3051.8
3048.6
3048.4
3047.7
3048.1
3045.0
3047.3
3048.9
3053.1
3055.3
3062.7
3069.8

134.5
267.4
386.3
451.7
572.7
655.0
711.2
851.5
967.7
1092.4
1353.4
1605.4

3049.8
3049.7
3048.8
3048.6
3046.8
3045.1
3047.3
3048.8
3055.6
3056.3
3063.8

203 .I
274.8
395.4
461.2
579.5
664 .3
753.2
870.3
995.1
1127.4
1410.0

469

906

998.9
620
3059.2
3053.9
3054.6
3053.7
3054.4
3050.1
3054 .6
3054.9

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1720.9

118.4
252 .I
349.6
486.2
643.0
693.3
764.9
883.9
945.8
1057.1
1184.9
1297 .I
1454.8
1636.2

3057.1
3054.4
3054.7
3054.1
3054.4
3051.3
3055.2
3055.8
3054.4
3056.5
3055.6
3055.9
3059.1
3060 .7

11

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90.0
151.7
375.6
441.5
547.5
645.7
698.6
829.0
933.2
1070.3
1280.6
1558.9

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82.0
242 .I
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471 .0
616.2
683.4
742.8
855.0
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1154.4
1289.9
1430.2
1606 .7
1720.9

3053.8

3063.3
3055.5
3056.1
3058.0
3061.8

160.4
268.8
374.5
503.0
653.0
707 .2
782.8
891 .7
973.5
1085.7
1217.7
1319.4
1488.4
1655.4

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.

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!""

Run Date: 27DCT94

Run Time: 16:26:00

HHVersion: 6.60

Data File:

FLOODm .HC2

Page

!""

ET
NH
!"" NH
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GR
GR
rGR
GR
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GR
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GR
GR
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767 .6
31
3080.0
3066.7
3060.3
3061.0
3059.6
3055.3
3056.2
3060.5
3060.0
3062.1
3063.4
3065.3
3071.6
3072.5
3077.4

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.037
73
0.0
175 .6
385.8
480.9
599.7
682.0
779.5
859.7
1020.8
1166.5
1290.7
1607.9
1844. 9
1963.8
2037.3

7.1
401.0
820.7
641.9
3078.3
3066.1
3060.9
3061.0
3059.6
3058 .7
3059.7
3062.0
3060.1
3062.0
3061.7
3066.7
3072.2
3072 .5
3081.6

.036
.048
702.9
22.0
212 .1
401.0
541.9
615.7
702.9
799.5
914.1
1045.7
1190.4
1415.1
1657.3
1862.4
1968.6
2074.5

457.9
2082.5
681
3075.2
3063.9
3059.8
3061.2
3060.7
3060.1
3060.1
3057.8
3060.4
3061.5
3061.5
3068.8
3072.9
3075.2
3082.6

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576
641.9

1024
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702.9

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690
59.5
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420.4
563.0
628.5
715.9
810.9
941.8
1084.2
1216.7
1471.2
1717.2
1884.0
1980.4
2082.5

680
3072.3
3062.1
3059.7
3058.9
3060.1
3059.8
3059.4
3057.8
3060.9
3061.5
3062.6
3069.9
3074.1
3075.7

95.1
307.7
439.3
573.5
641.9
751 .3
820.7
967.9
1140.6
1236.6
1522.6
1775.7
1915.5
2002.2

3069.9
3061.2
3061.0
3058.4
3055.4
3056.2
3060.4
3058.4
3059.2
3062.9
3063.8
3070.4
3074.3
3075.0

121 .0
346.8
457.9
588.9
664.6
767.6
835.2
1002.3
1152.6
1261.6
1556.9
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3065.8
3067.3
3067.0
3066.6
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209.6
382.0
505.7
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471.8
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1308.9
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tUU CROSS-SECTION 33 HAS BEEN MODIFIED TO REFLECT THE REALIGNMENT OF THE
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Run Date: 270CT94
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249.4
291.5
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p- ***** CROSS-SECTION 35 HAS BEEN MODIFIED TO REFLECT THE REALIGNMENT OF
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172.8
249.4
326.7
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190.6
262.2
362.7
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3086.2
3085.8
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3085.7
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310.0
403.0
480.6
570.7
666.4
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1390
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3085 .7
3085.8
3085.4
3086.3
3084.9
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3088.0
3089.0
3090
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158 .7
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418.0
497.2
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228.6
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265.4
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3086.5
449.5
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463.9
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540.4
3085.9
558.8
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593.8
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623.6
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3087 .5
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1195
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1240
3089.9
1320
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1570
3088.8
1582
3090
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UU.t CROSS-SECTION 36 HAS BEEN MODIFIED TO REFLECT THE REALIGNMENT OF
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UUi ET CARD {RIGHT ENCROACHMENT) DEFINES INEFFECTIVE FLOW AREA
UUt DUE iO RIDGE LOCATED BETWEEN CROSS-SECTIONS 36 &37
tUU:

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CROSS-SECTION 34 HAS BEEN MODIFIED TO REFLECT THE REALIGNMENT OF THE
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EV tUU

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35.7
139.2
536.4
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14

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Run Date: 270CT94

Run Time: 16:26:DO

HKVersion: 6.60

Data File:

FLOODWY1.HC2

Page

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120.6
258.8
489.5
641.6
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924.6
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64.5
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316.0
534.1
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15

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Run Date: 270CT94

,..
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T2
T3
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16:26:00

HMVersion: 6.60

Data File:

FLOODWY1.HC2

Page

UPPER CANADA DEL ORO FLOOD INSURANCE STUDY -- FLOODWAY (ENCROACHED)
CATALINA STATE PARK BOUNDARY TO PINAL COUNTY LINE
CANADA DEL ORO
CONSULTANT: DAVID EVANS &ASSOCIATES, INC.
DEA JOB NO. PCDT0010
3845 N. BUSINESS CENTER DRIVE
PHONE: (602) 292-2160
TUCSON, AZ 85705
FAX: (602) 292-9131
CLIENT: PIMA COUNTY DEPT. Of TRANS. &FLOOD CONTROL DISTRICT
201 N. STONE AVENUE
ACTIVITY # 4FUCDO

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Run Date: 27DCT94

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Run Time: 16:26:00

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Data File:

FLOODUY1.HC2

THIS RUN EXECUTED 270CT94

tttllllllllttltltlltlltttttillltilttl

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621.00

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1314.50

1171.70
1171.70

22.00
621.00

1314.50
1314.50

1365.66
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2.000

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310.00

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1001.40

667.20
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10.60
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1001.40
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251.00

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611.00

697.60
697.60

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769.60
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4.000
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427.00

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625.00

443.00
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149.46
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557.00
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159.00

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267.00
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99.00

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690.00

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98.78
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179.00
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16:26:29

17

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53.20

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12.000
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225.00

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237.10
137.10

67.27
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293.70
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222.10

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221.20
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101.33
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186.90
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100.00
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585.00
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168.20
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100.00
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277.00
277.00

585.00
585.00

14.300
14.300

110.00
110.00

590.00
590.00

118.00
128.00

113.70
123.68

345.00
345.00

586.92
586.94

14.600
14.600

110.00
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590.00
590.00

118.00
128.00

123.06
123.06

345.00
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587.45
587.45

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15.000
15.000

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251.10

692.00
654.00

251.10
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128.58
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340.60
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214.00

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205.00

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733.00

481.90
481.90

47.99
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522.20
522.20

864.65
733.00

....

21 .000
21.000

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220.00

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372.00
372.00

96.38
220.00

423.00
423.00

792.67
592.00

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22.000
22.000

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180.00

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601.00

180.00
180.00

62.02
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241.00
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910.15
601.00

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22.500
22.500

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19.40

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531.00

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19.36
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61.00
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968.36
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23.000
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167.00

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591.00

167.00
167 .00

75.97
167 .00

276.30
276.30

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24.000
24.000

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243.00

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749.00

416.80
416.80

65.06
243.00

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455 .1 0

865.11

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FLOODWYl.HC2
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STENCL

STENCR

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312.00

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312.00
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196.17
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350.00
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1099.10
850.00

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25.000
25.000

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274.00

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885.00

274.00
274.00

106.54
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303.40
303.40

1068.09
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25 .1 00
25 .1 00

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315.00

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975.00

315.00
315.00

88.81
315.00

365.00
365.00

1284.07
975.00

26.000
26.000

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122.90

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881.00

122.90
122.90

100.54
122.90

157.20
157.20

1348.10
881.00

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27.000
27.000

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305.00

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920.00

309.90
309.90

188.62
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410.00
410.00

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28.000
28.000

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390.00

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805.00

415.60
415.60

152.87
390.00

588.70
588.70

1069.69
805.00

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29.000
29.000

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352.00

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797.00

645.70
645.70

143.57
352.00

698.60
698.60

944.23
797.00

60\

30.000
30.000

.00
469.00

.00
906.00

675.20
675.20

161.47
469.00

725.20
725.20

1389.50
906.00

~~

31.000
31.000

.00
576.00

.00
1024.00

641.90
641.90

293.18
576.00

702.90
702.90

1525.48
1024.00

e..s

32.000
32.000

.00
517.40

.00
1104.00

517.40
517.40

417.53
517.40

614.80
614.80

1453.53
1104.00

Er

33.000
33.000

.00
415.00

.00
1047.00

445.30
445.30

229.86
415.00

488.60
488.60

1332.07
1047.00

6«.

34.000
34.000

.00
249.40

.00
874.00

249.40
249.40

113.54
249.40

291 .50
291.50

1446.79
874.00

e.v

35.000
35.000

.00
283.00

.00
781.20

706 .1 0
706 .1 0

67.11
283.00

781.20
781.20

1585.53
781 .20

e. ...

36.000
36.000

.00
585.00

1391.00
1014.70

949.60
949.60

46.48
585.00

1014.70
1014.70

1061.89
1014.70

rsv:

37.000
37.000

.00
761.00

.00
1128.80

1082.90
1082.90

118.91
761.00

1130.60
1130 .60

1128.85
1128.80

F-'(

"'"'

Page

19

r

r

,.

Run Date: 270CT94

Run Time: 16:26:00

HMVersion: 6.60

Data file:

fLOODWY! .HC2

Page

20

I CANADA DEL ORO

SUMMARY PRINTOUT TABLE 110

.I"'

SECNO

CWSEL

o:r 1. 000

1.000

2883.\D
2884.50

1.00

.00

2884.16
2885.43

1343.66 12667.25
693.50 11156.82

4574.33
6343.18

258.42
.00

693.50

.00

.00
621 . 00

1171.70
1171.70

1314.50
.00
1314.50 1314.50

., .. 1.000
1.000

1889 .70
1890.68

.00
.97

1890.8D
1892.14

1105 .28 11160.91
691.40 10170.92

5416.99
7219.07

911.10
.00

.00
691.40

.00
310.00

887.20
887.20

1001.40
.00
1001.40 1001.40

,~

3.000
3.000

1897.64
2898.61

.00
.98

1898.70
2900.18

945.46 9068.45
560.00 10224.91

4330.76
6016.98

4100.79
1258.11

.00
560.00

.00
251.00

697.60
697 .60

769.60
769.60

.00
811.00

, ... 4.000
4.000

2906.18
2907.05

.00
. 87

2907.41
2908.87

918.07
398.00

2481.86
252.08

6758.64
8678.18

8258.50
8569.74

.00
398.00

.00
427.00

443.00
443.00

557 .00
557 .00

.00
815.00

, ... 4.500
4.500

2909.72
2910.32

.00
.60

1910.91
1912.14

986.74
490.00

1910.39
450.69

6530.02
8238.70

8059.59
8810.61

.00
490.00

.00
159.00

179.00
179.00

287 .00
287.00

.00
649.00

~05.000

1911.91
2913.86

.00
.94

1913.60
2914.63

988.55
591.00

.00
.00

3541.73 13958.27
4276.10 13223.90

.00
591.00

.00
99.00

9\.00
99.00

179.00
179.00

.00
690.00

09 6.000

6.000

2919.52
2920.03

.00

.51

1920.64
2921.83

1020.44
458.00

18.18
.00

3427 .Oi 14054 .81
4184.94 13315.06

.00
458.00

.00
28.00

28.00
28.00

77.00
77.00

.00
486.00

7. 000
7.000

1916.16
2927.16

.00
1.00

1927 .05
2928.27

944.32
527.80

.07 3716.60 13783.32
.00 4644.22 12855.78

.00
527.80

.00
22.20

22.20
12.20

91.40
91.40

.00
550.00

,.,8.000
8.000

1931.13
1932.36

.00
.23

2933.34
2934.33

1019.39
439.50

.00 12060.75
.00 14773.89

5439.25
2716.11

.00
439.50

.00
11 .so

5.00
5.00

243.00
243.00

.00
451.00

~ 9.000

9.000

2937.24
2937.74

.so

.00

2938.21
2939.49

1165.16
498.00

179.70 9542.79
.00 13106.10

7777 .so
4393.89

.00
498.00

.00
88.00

88.00
88.00

380.00
380.00

.00
586.00

trr10. 000
10.000

2943.18
2944.19

.00
1.01

2943.99
2945.29

1024.85
584.30

.00
.00

4305.67 13194.33
6404.93 11095.07

.00
584.30

.00
45.70

19.00
19.00

213.00
213.00

.00
630.00

0~11.000

11.000

1947.78
2948.31

.00
.53

2948.74
2949.83

1003.72
576.80

.00
.00

4323.00 13177.00
5521.35 11977.65

.00
576.80

.00
53.20

45.00
45.00

135.00
135.00

.00
630.00

.,12.000
12.000

2953.86
2954.83

.00
.97

1954.69
2956.03

194.25
590.00

2288.71
140.67

2897.42 12313.87
3930.15 13429.18

.00
590.00

.00
225.00

237.10
237.10

293.70
293.70

.00
815.00

•

.,.),3.000
1UOO

2960.13
2960.47

.00
.33

2961.58
2961.93

648.54
537.80

1518.43
.00

4060.25 11J21.31
4257.87 13242.13

710.00
537.80

50.00
222.20

222.20

222.20

286.90
286.90

760.00
760.00

I

0<14.000
14.000

2965.22
2965.21

.00
-.01

2967.08
2967.08

485.00
485.00

200i.04
2001.33

9543.06
9556.t·4

5955.90
5942.03

485.00
485.00

100.00
100.00

168.20
168.20

277.00
277.00

585.00
585.00

14 .300
14.300

2966.31
2966.33

.00
.02

2967.69
2967.70

463.22
463.26

22.50 13524.73
2L.b:5

3952.77
J\66. 08

480.00
480.00

110.00

126.00
128.00

345.00
345.00

590.00
590.00

,.

••
!"'
! •
•
!"'

•
!"'

5.000

,.~

0'1

!"'
i

••

,...
•

,.'

,.
,..

,.
"'
"'

-

DlfKWS

EG

TOPWID

OLOB

OCH

13511.2?

OROB

PERENC

STENCL

1 ~ o..~c

SiCHL

STCHR

STENCR

r-

1

Run Date:

270CT94

SECNO

CWSEL

~14.600

Run Time: 16:26:00

DIFKWS

EG

HHVersion: 6.60

TOPWID

OLOB

·•14.600

2966.94
2966.95

.00
.01

2967.99
2968.00

464.38
464.40

!>CIS .000
15.000

2967.17
2967.73

.00
.56

2968.91
2969.76

525.52
402.90

2964.98

.oo

E416.000
16.000

2972.11
2972.85

.00
.74

2972.83
2974.07

905.39
543.46

c.l7.000
""1.7 .000

2974.80
2975.72

.00

.92

~18.000

18.000

2980.95
2981.94

EP19.000
19.000

!"" '

Data File:
QCH

Page

FLOODWY!.HC2
QfiOB

PERENC

SiENCL

21

STCHL

STCHR

STENCR

4348.14
4351.69

480.00
480.00

110.00
110.00

128.00
128.00

345.00
345.00

590.00
590.00

7734.60
8655.14

6800.42
8844.oo

692.00
402.90

.00
251.10

251.10
251.10

340.60
340.60

692.00
654.00

5163.05
3100.75

3407.34
4563.23

8929.61
9836.02

.00
558.00

.00
224.00

352.10
352.10

420.50
420.50

.00
782.00

2975.94
2977.35

871.90 11616.92
517.80 10136.34

5517.85
7363.66

365.23
.00

.00
517.80

.00
328.00

744.40
744.40

845.80
845.80

.00
845.80

.00
.99

2981.88
2983.11

904.64 14663.21
625.00 13706.20

2678.85
3574.74

157.94
219.06

.00
625.00

.00
365.00

923.60
923.60

975.50
975.50

.00
990.00

2985.67
2986.56

.00
.88

2986.69
2988.04

810.41 13275.35
525.00 12038.75

4000.56
5461.25

224.09
.00

.00
525.00

.00
264.00

713.90
713.90

789.00
789.00

.00
789.00

ii20.000
20.000

2991.98
2992.97

.00
.98

2993.24
2994.55

816.66
528.00

6501.91
6363.24

3067.37
3766.57

7130.72
7370.18

.00
528.00

.00
205.00

481.90
481.90

522.20
522.20

.00
733.00

'

e;:21.000
21.000

3001.24
3001.84

.00
.60

3002.69
3003.89

696.29
372.00

7507.98
7020.82

5008.06
5944.70

4983.97
4534.48

.00
372.00

.00
220.00

372.00
372.00

423.00
423.00

.00
592.00

!""'

~22.000

22.000

3007.62
3008.57

.00
.95

3008.83
3010.02

848.13
421.00

922.48
.00

6249.60 10327.92
7037.42 10462.58

.00
421.00

.00
180.00

180.00
180.00

241.00
241.00

.00
601.00

,. '

..~22.500
22.500

3010.51
3011.38

.00
.87

3011.46
3012.92

968.99
511.60

.00
.00

4274.04 13225.96
5633.55 11866.45

.00
511.60

.00
19.40

.00
.00

81.00
81.00

531.00

'

,..23.000
""'23.000

3014.06
3015.01

.00
.95

3015.40
3016.98

845.81
424.00

1109.87
.00

7152.53
9315.45

9137.60
8174.55

.00
424.00

.00
167.00

167.00
167.00

276.30
276.30

.00
591.00

oc24.000
24.000

3022.79
3023.79

.00
.99

3023.76
3025.03

800.84
506.00

6021.72
5186.57

1676.88
3368.89

8801.41
8944.54

.00
506.00

.00
143.00

416.80
416.80

455.10
455.10

.00
749.00

""'14.100
24.100

3027.08
3027.98

.00
.90

3027.86
3029.06

902.93
538.00

1156.22
.00

2397.05 13946.73
2848.04 14651.96

.00
538.00

.00
312.00

311.00
312.00

350.00
350.00

.00
850.00

e<-25.000
25.000

3030.76
3031.73

.00
.97

3031.57
3031.76

961.55
611.00

1534.85
.00

2101.25 13863.90
2466.52 150J3.48

.00
cll.OO

.00
274.00

274.00
274.00

303.40
303.40

.00
885.00

,..15 .1 00
~ '25 .100

3033.83
3034.71

.00
.88

3034.68
3035.80

1195.26

ocO.OO

1640.19
.00

3928.94 11730.87
4500.12 1199\.ii

.00
660.00

.00
315.00

315.00
315.00

365.00
365.00

.00
975.00

eo,~26. 000

26.000

3036.88
3037.86

.00
.17

3037.36
3038.52

1247.56
758.10

198.36
.00

1590.36 15711.28
2006.88 15~~1.12

.00
7sa .1 c

.00
122' 10

122 .90
122. :;v

157.10
i57 .20

.00
681.00

eo27.000
27.000

3040.95
3041.95

.00
1.00

3041.83
3043.48

il94.29
615.00

782.12
27.43

3475.0, 15241.);
5491.33 11981.24

.00
blS.OO

.']0
305.00

30i.i0
309.\0

410.00
410.00

.00
920.00

•
'

... '

I

!""
I

!""

,.

,..I

..
...

26.64 13125.22
26.68 13121.62

or,

r
...
Run Oate: 270CT94

Run Time: 16:26:00

HMVersion: 6.60

Data File:

Page

FLOODWY!.HC2

22

!""

SECNO

r-:
...
I
... I

!""

I

...
...
!""

...

!""

-

CWSEL

DlfKWS

EG

iOPWID

OLOB

OCh

OhDB

PERENC

SiENCL

SiCHL

s;m

STENCR

w28.000
28.000

3045.63
3046.43

.00
.60

3046.68
3048.47

891 .88
400.55

2868.72 8732.60
483.89 11721.80

5898.66
5294.30

.00
415.00

.00
390.00

415.60
415.60

586.70
588.70

.00
805.00

IIG'29. 000
29.000

3051.53
3052.49

.00
.96

3052.78
3053.96

800.66
445.00

8132.59
8680.75

4334.25
5021.31

5033.17
3717.93

.00
445.00

.00
352.00

645.70
645.70

698.60
698.60

.00
797.00

ee>30 .000
30.000

3057.03
3058.04

.00
1.00

3057.88
3059.97

1179.96
437.00

6636.45
5168.36

3871.69
5682.64

6991.86
6649.00

.00
437.00

.00
469.00

675.20
675.20

725.20
725.20

.00
906.00

....,31.000
31.000

3062.70
3063.67

.00
.97

3063 .7b
3065.16

1148.50
448.00

3469.71
1614.51

4681.33 9348.96
5705.29 10180.20

.00
448.00

.00
576.00

641.90
641.90

702.90
.00
702.90 1024.00

~32.000

32.000

3069.32
3070.09

.00
.77

3070.28
3071.65

1036.01
586.60

866.85
.00

5774.47 10858.68
7625.90 9874.10

.00
586.60

.00
517.40

517.40
517.40

.00
614.80
614.80 1104.00

.,..33.000
33.000

3077 .61
3078.41

.00
.80

3078.71
3079.93

1102.21
632.00

3736.61
1207.97

4134.12 962'1,2i
4993.77 11296.25

.00
632.00

.00
415.00

445.30
445.30

488.60
.00
488.60 1047.00

..~4 .000
34.000

3084.19
3085.18

.00
. 99

3084.67
3085.84

1333.26
624.60

3048.20
.00

1227.55 12224.25
2743.68 14756.32

.00
624.60

.00
249.40

249.40
249.40

291.50
291.50

.00
874.00

eol35 .000
35.000

3089.13
3089.94

.00
.82

3090.17
3091.45

1089.63 12bi0.32
498.20 12167.60

4068.90
5332.40

820.77
.00

.00
498.20

.00
283.00

706.10
706.10

781.20
781.20

.00
781.20

""36. 000
36.000

3094.20
3095.11

.00
. 91

3095.23
3096.72

1015.41 1223&.46
429.70 11201.98

4971.72
b298.02

289.82
.00

1391.00
429.70

.00
585.00

949.60

949.60

1014.70 1391.00
1014.70 1014.70

l5'f 37

3099.85
3100.82

.00
.97

3100.b7
3102.43

1009.94 14928 .5;
367.80 14015.42

2571.4;
3484.58

.00

.00

.00
367.80

.00
761.00

1082.i0
1082.90

1130.60
.00
1130.60 1128.80

.000
37.000

r
r'

Run Date: 270CT94

Run Time: 16:26:00

HMVersion: 6.60

Data File:

FLOODWY! .HC2

Page

23

'"' CANADA DEL ORO
SUMMARY PRINTOUT TABLE 150

'"'
r
i

SECNO

XLCH

ELTRD

ELLC

ELMIN

Q

CW5EL

ems

EG

10<KS

VCH

AREA

.OlK

1>r uoo
1.000

.00
.00

.00
.00

.00
.00

2877.90 17500.00
2877.90 175DO.OO

2&83.50
2884.50

2883.12
2883.82

28&4 .16
2885.43

78.95
66.64

9.36
10.05

3035.83 1969 .55
2466.35 2143.80

2.000
2.000

570.00
570.00

.00
.00

.00
.00

2884.00 17500.00
2884.00 17500.00

288i.70
2590.68

2889.70
2890.68

2890.80
2892.14

108.73
93.56

12.51
13.26

2610.06 1678.27
2227.55 1809.21

3.000
3.000

685.00
685.00

.00
.00

.00
.00

2892.30 17500.00
2892.30 17500.00

2897.64
2818.62

1897.64
2818 .61

1898.70
2900.28

101.66
103.70

11.91
14 .81

2558.58 i735 .69
2068.53 1718.46

1'1' 4. 000

935.00
935.00

.00
.00

.00
.00

2900.50 17500.00
2900.50 17500.00

2906.18
2907.05

2906.17

'"' •
...

4.000

2906.32

2907.41
1908.87

85.54
81.49

12.21
13.30

2422.43 1892.16
1803.99 1938.62

.,._,4. 500
4.500

375.00
375.00

.00
.00

.00
.00

2903.60 17500.00
2903.60 17500.00

2909.72
2910.32

2909.72
2910.32

2910.91
2912.14

86.13
92.99

12.37
13.89

2495.16 1885.62
1906.05 1814.78

.,.,5. 000
5.000

375.00
375.00

.00
.00

.00
.00

2907.30 17500.00
2907.30 17500.00

2912.92
2913.86

2912.35
2912.62

2913.60
2914.63

69.78
53.76

10.22
10.15

2965.35 2094.99
2748.60 2386.75

•

0!'6 .000
6.000

710.00
710.00

.00
.00

.00
.00

2913.80 17500.00
2913.80 17500.00

2119.52
2910.03

2919.52
2920.03

2920.64
2921.83

102.10
123.21

13.75
15.28

2396.70 1731.88
1770.35 1576.56

-oq7 .000

800.00
800.00

.00
.00

.00
.00

2920.50 17500.00
2920.50 17500.00

2Jlb .1c
2927.16

2125.95

2926.44

2927.05
2928.27

77.78
65.87

11 . 38
11.75

2577.58 1984.31
2254.81 2156.25

1>~8. 000

8.000

740.00
740.00

.00
.00

.00
.00

2926.30 17500.00
2926.30 17500.00

2932.13
2932.36

2932.13
2932.36

2933.34
2934.33

56.21
73.11

10.23
12.01

2500.21 2334.14
1701.07 2046.65

D$9.000
9.000

610.00
610.00

.00
.00

.00
.00

2932.20 17500.00
2932.20 17500.00

2937.24
2137.74

2937.24
2~37 .74

2938.21
2939.49

83.01
100.64

9.56
11.46

2523.47 1920.70
1727.66 1744.40

DT10.000
10.000

660.00
660.00

.00
.00

.00
.00

2938.60 17500.00
2136.60 17500.00

2143.18
2944.19

2942.83
2943.58

97 . 57
78.68

U3
10.01

2506.59 1771.67
2148.21 1972.%

""11.000
11 . 000

450.00
450.00

.00
.00

.00
.00

2943.10 17500.00
2943.10 17500.00

2i47.78
2948.31

294&.=/'

2J43. 99
2945. ''
2948.74
2941.83

95.29
107.68

1i. 91
13.60

2563.30 1792.71
1975.06 1686.45

t>/12.000
12.000

655.00
655.00

.00
.00

.00
.00

2948.30 17500.00
2948.30 17500.00

2953.&6

2954.83

dS3 .S·~
2954.41

2'1:04.6'1
2956.03

86.63
82.26

11.56
12.86

2626.26 1860.21
2196.27 1929.51

.ooo

.00
.00

2954.80 17500.00
2954.80 17500.00

;::·160.47

2960.13

21b0.13

2?61.58

114.40
lJ0.92

13.65
13 .A

li/4.73 l636.lc
1939.;7 174L.05

.00

2158.40 !ISCO.OO
2\58.40 17500.00

2%).L2
~ c,c,S, ~ ~

2·n.s. 22
~: l s. il

d6/. 00
'-; b7. JE

7'. Ji
7~. 81

13.60
j_j. 73

i102.08 2047.56
1975.09 2037.00

2~S·i.~·O 17\0C.OO
2957.30 17)00.00

2~bo.~~'"

2Jt.:.. s~

2j6f' .6S

46 . 2~,

~--b).ob

~"767.70

10.4i

~~66.:,:

4:. 'tJ5

10. 37

2103.£.5
i·ll2.51

•
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I

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,..I

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,..

...
...

to<

PL

7.000

'

0 .,13

13.000

650.00
650.00

.00
.00

•

1)>(14.000
14.000

520.00
520.00

.00

.00

. 00

14.300
14.300

80.00
80.00

2974.81

2981.43

2n4 .83

2981.43

2947.64

~·j&0.2b

~961.93

257 3. H
2590.:0

,.
Run Date: 270Ci94

""

!

SECNO

ELTRD

ELLC

HMVemon: 6.60

Data file:

ElMIN

fLOOOWYl.HC2

ems

EG

Page
1O•KS

VCrl

24
.01K

D'i 14.600

14.600

53.00
53.00

2974.83
2974.83

2981.43
2981.43

2959.30 17500.00
2959.30 17500.00

1%&.94
2966.95

2965.66
2965.66

2967.91
2968.00

31.02

31.13

9.13
9.12

2397.72 3136.40
2400.67 3142.28

.ooo
' 0 eJ515.000

121.00
121.00

.00
.00

.00
.00

2960.70 17500.00
2960.70 17500.00

2967.17
2967.73

2967 .13
2967.73

2968.91
2969.76

80.98
82.98

14.03
14.41

2011.73 1944.74
1776.71 1921.14

16.000

560.00
560.00

.00
.00

.00
.00

2965.10 17500.00
2965.10 17500.00

2972.11
2972.85

2971.47
2972.30

2972.83
2974.07

59.11
73 .13

7.95
9.53

2627.75 2276.09
2011.87 2046.41

~1!17

.000
17.000

490.00
490.00

.00
.00

.00
.00

2968.50 17500.00
2968.50 17500.00

2974.80
2975.72

2974.80
2975.64

2975.94
2977.35

87.22
86.65

11.89
13.22

2349.86 1673.85
1936.55 1880.04

&<.18.000
18.000

770.00
770.00

.00
.00

.00
.00

2975.20 17500.00
2975.20 17500.00

2980.95
2981.94

2980.77
2981.72

2981.88
2983.11

81.7&
75.27

11.38
12.46

2388.40 1935.34
2169.34 2017.14

E'D19.000
19.000

610.00
610.00

.00
.00

.00
.00

2980.20 17500.00
2980.20 17500.00

2985.67
2986.56

2985.39
2986.39

2986.69
2988.04

73.29
81.72

11.19
12.89

2329.78 2044.18
1932.34 1935.81

IOE20 .000
20.000

730.00
730.00

.00
.00

.00
.00

2985.70 17500.00
2985.70 17500.00

2991.98
2992.97

2991.97
2992.97

2993.24
2994.55

110.54
94.10

14.43
14.92

2194.15 1664.50
1921.49 1804.06

*

e..-21.000
21.000

1060.00
1060.00

.00
.00

.00
.00

2992.40 17500.00
2992.40 17500.00

3001.24
3001.84

3001.24
3001.84

3002.69
3003.89

73.84
78.72

14.18
15.46

2161.30 2036.55
1730.18 1972.39

'

~22.000

22.000

1020.00
1020.00

.00
.00

.00
.00

2998.90 17500.00
2998.90 17500.00

3007 .bi
3008.57

3007.62
3008.19

3008.83
3010.02

so. 10
47.35

12.83
12.91

2580.05 2472.46
2113.25 2543.27

E>l22 .500
22.500

490.00
490.00

.00
.00

.00
.00

3003.30 17500.00
3003.30 17500.00

301U1
3011.38

3010.41
3011.38

3011.46
3012.92

&9.58
76.i5

12 .1 0
13.85

2639.42 2097.90
2000.22 1\95.01

490.00
490.00

.00
.00

.00
.00

3007.00 17500.00
3007.00 17500.00

3014.06
3015.01

3014.06
3015.01

3015.40
3016.98

84 .42
83.53

12.71
13.83

2369.24 1904.66
1786.08 1914.80

E\!24.000
24.000

980.00
980.00

.00
.00

.00
.00

3015.90 17500.00
3015.90 17500.00

3022.79
3023.7i

3022.52
3023.19

3023.76
3025.03

85.45
79.32

12.22
13.11

2400.42 1893.1o
2119.93 1964.90

~d4

.100
L4.100

540.00
540.00

.00
.00

.00
.00

3020.50 17500.00
3020.50 17500.00

3027.0¢
3027.98

3026.67
3027.45

3027.86
3029.06

66.97
69.46

11.01
11.31

2668.94 213d.46
2178.20 2099.74

.,,_25.000
25.000

510.00
510.00

.00
.00

.00
.00

3023.30 17500.00
3023.30 17500.00

3030 .7&
3031.73

3030.38
3031.16

3031.57
3032.76

81.42
78.24

12.00
12.12

2656.16 1939.46
2264.35 1978.44

e,.25.100
25.100

400.00
400.00

.00
.00

.00
.00

3026.30 17500.00
3026.30 17500.00

3033.83
3034.71

3033.65
3034.\2

3034.68
3035.80

67 .36
65.41

12.05
12.17

2888.59 2132.25
2337.44 2163.71

.w26.000
2&.000

470.00
470.00

.00
.00

.00

3030.60 17500.00

3036.88

3036.14

3037.36

.00

3030.60 17500.00

3037 .So

3036.97

3038.52

4& .1 t
48.21

9.12
9.67

3328.05 2575.64
2716.41 2520.36

' ""'27 .000
27.000

670.00
670.00

.00
.00

.00
.00

3036.40 17500.00
3036.40 17500.00

3040.95
3041.?5

3040.90
3041.%

304!.83

127.63
l2o.17

11.12

2527.44 l54i.Oi
193?.97 1553.0~

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Run Time: 16:2&:00

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Run Date: 270Ci94

r
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,..

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Data File:

FLOODWYl .HC2

Page

25

ems

EG

3040.40 17500.00
3040.40 17500.00

3045.63
3046.43

3045.63
3046.43

3046.88
3048.47

81.91
85.18

12 . 90

11 .33

2300.21 1933.62
1659.08 1896.13

.00
.00

3045.00 l/500 .00
3045.00 17500.00

3051 .53
3052.49

3051 .4b
3051.98

3052.78
3053.96

107.95
87.01

14.i7
14.08

2366.45 1684.30
2069.36 1876.06

.00
.00

.00
.00

3049.80 17500.00
3049.80 17500.00

3057.03
3058.04

3056. 78
3058.04

3057 .8&

3059.97

64.97
84.78

12.54
15 .84

3022.11 2171.14
1881.00 1900.57

680.00
680.00

.00
.00

.00
.00

3055.30 17500.00
3055.30 17500.00

3061.70
3063.67

3062.70
3063.12

3063.76
3065.16

75.12
67.00

13.02
13.t.2

2677.08 2019.09
2063.70 2137.91

.,.,.n .ooo

835.00
835.00

.00
.00

.00
.00

3063.40 17500.00
3063.40 17500.00

3070.09

306~.32

3069.23

3070.07

3070.28
3071.65

96 .19
108.55

1i.d0
13.51

2888. i3 1784.32
2193.20 1679.64

~33.000

33.000

850.00
850.00

.00
.00

.00
.00

3069.20 17500.00
3069.20 17500.00

3077 .61
3078.41

3077.61
3078.33

3078.71
3079.93

105.39
104.52

14.64
15.7 5

2898 .&5 i/04 .66
2347.81 1711.77

,;v14.000
34.000

890.00
890.00

.00
.00

.00
.00

3077.40 17500.00
3077.40 17500.00

3084. H
3085.18

3083.36
3083.12

30&4.67
3085.84

58.07
60.16

9.65
10.07

3655.89 2296.39
2895.68 2256.21

e.~35.000

35.000

750.00
750.00

.00
.00

.00
.00

3083.40 17500.00
3083.40 17500.00

3089.13
3089.14

3088.96
3089.63

3090 .17
3091.45

108.97
107.86

12.65
13.91

2580.92 1676.41
2030.20 1685.01

"" 36.000
36.000

570.00
570.00

.00
.00

.00
.00

3087.50 17500.00
3087.50 17500.00

3094.20
3095.11

3094.01
3094.72

3015.23

30%.72

76 .74
82. i6

13.04
14 .29

2895.31 1997.70
2069.64 1921.37

"'(37 .000

620.00
620.00

.00
.00

.00
.00

3093.80 17500.00
3093.80 17500.00

30li.&5
3100.82

309l.45
3100.22

3100.67
3102.43

100.71
102.61

11.75
13.24

2626.73 1743.82
1778.51 1727.62

XLCH

'el" 28.000

28.000

450.00
450.00

.00

.00
.00

29.000
29.000

640.00
640.00

.00

.00

I!Cl30 .000

30.000

620.00
620.00

....,31.000
31.000
32.000

~,

HMVersion: 6.60

CWSEL

SECNO

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Run Time: 16:26:00

37.000

EliRD
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ELLC

ELM IN

Q

10>K5

VCH

AREA

.01K

I"'
;

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Run Date: 270CT94

Run iime: 16:26:00

HMVersion: 6.60

Data fiJe:

FLOODWY!.HC2

I"'
CANADA DEL ORO
I"' SUHHARY PRINTOUT TABLE 1so

SEC NO

,.

Q

CWSEL

DIFWSP

DIFWSX

DlfKWS

iDYwiD

XLCH

PJ 1.000 17500.00
1.000 17500.00

2883.50
2884.50

.00
1.00

.00
.00

1. 00

.00

1343.66
693.50

.00

""''

2. 000 17500.00
2.000 17500.00

2889.70
2890.68

.00
.97

6.20
6.18

.00
.97

1105.28
691 .40

570.00
570.00

Dl.. 3.000 17500.00
3.000 17500.00

2897.64
2898.62

.00
.98

7.93
7.94

.00
.98

945.46
560.00

685.00
685.00

I"'

Df¥\ 4.000

17500.00
4.000 17500.00

2906.18
2907.05

.00
.87

8.43

B.~J

.00

.87

918.07
398.00

935.00
935.00

t>..J4. 500 17500.00
4.500 17500.00

2909 .72
2910.32

.00
.60

3.54
3.27

.00
.60

986.74
490.00

375.00
375.00

DOS .000

17500.00
5.000 17500.00

2912.92
2913.86

.00
.94

3.20
3.54

.00
.94

988.55
591 .00

375.00
j75.00

I"''

Dl'6 .000 17500.00
6.000 17500.00

2919.52
2920.0j

.00

6.60
6.17

.00

. 51

. Sl

1020.44
458.CO

liO.OO
710.00

,.

~

7.000 17500.00
7.000 17500.00

2926.!6
2927.16

1.00

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6.64
7.13

.00

944.32

!.GO

527.80

800.00
800.00

8.000 17500.00
8.000 17500.00

2932.13
2932.36

.00
.23

5. 97

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.23

1029.3!
439.50

740.00
740.00

t>5 9.000 17500.00
9.000 17500.00

2937.24
2937.74

.00
.50

5.1 i

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i

.so

1165.16
498.00

610.00
610.00

,.

vr10.000 17500.00
10.000 17500.00

2943.18
2944.19

.00
1.01

5.94

6.44

1. 01

.00

1024.85
584.30

660.00
660.00

0.. 11.000 17500.00

11 .000 17500.00

2947.78
2948.31

.00
.53

4.59
4.12

. 53

.00

l 003 .72
576.80

450.00

DV 12.000

17500.00
12.000 17500.00

2953.86
2954.83

.00
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o.08
6.52

.00

994 '25

v55.00

Dol13.000 17500.00
13.000 17500 .00

2960.13
2960.47

.00

6.28

b 43

':.4
S37 .QC

650.00
6',0.00

0 _..14.000

17500.00
14.000 17500.00

2965.22
2965.21

455.0·)
465.00

520.00

14.300 17500.00
14.300 17500.00

2966.31

'

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2966.33

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S.Oi
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l.OS

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1.12

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590.00

46 '3 . 2~

463.=0

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450.00

655.00

~'-

c' . \)~_;

6~

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S·J. 0(

Page

26

r
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Run Date: 270CT94

,..

SECNO

Q

w 14.600

Run

Ti~e:

CWSEL

16:26:00
OJFWSP

HMVersion: 6.60
OIFWSX

DlfKWS

Data file:
iOPWJD

fLOODWY!.HC2

XLCH

17500.00
14.600 17500.00

2966.94
2966.95

.00
. 01

.b2

.63

.00
. 01

464.3;
464 .40

53.00
53.00

0 •15.000

15.000 17500.00
17500.00

2967.17
2967.73

.00
.56

.78

.23

.00
.56

525.52
402.90

121.00
121.00

Elo.16 .000 17500.00
16.000 17500.00

2972.11
2972.85

.00
.74

4.94
5.12

.00
. 74

905.39
543.46

560.00
560.00

E'f 17.000 17500.00

17.000 17500.00

2974.80
2975.72

.00
.92

2.09

2.87

.00
.S2

871. ~0

517.80

490.00
490.00

~ 18.000

17500.00
18.000 17500.00

2980.95
2981.94

.00
.99

6.14

.00
.99

904.64
625.00

77 0. 00
770.00

ep19.000 17500.00
19.000 17500.00

2985.67
2986.56

.00
.88

4.73

.00

~0.000

17500.00
20.000 17500.00

2991 .98
2992.97

.00
.98

a:21.000 17500.00
21.000 17500.00

3001.24
3001 .84

.00
.60

8.88

r~ ""22. 000 17500.00
22.000 17500.00

3007.62
3008.57

.00
. ~5

6.JJ

6.73

22.500 17500.00
22.500 17500.00

3010.51
3011.38

.00
.87

2.90
2.81

17500.00
17500.00

3014.06
3015.01

.00
. 95

!OJ' 24

.000 17500.00
24.000 17500.00

3022 .79
3023.79

e,:24.100 17500.00
24.100 17500.00

r"

,.

I

I

I"'
I"'

4.62

.88

810.41
525.00

610.00
610.00

6.31

6. 41

.00
.98

816.66
528.00

730.00
730.00

9.26

.00
.60

696.29
37:.00

1060.00
1060.00

.;s

.00

&48.13
421.00

1020.00
1020.00

.67

.00

968.99
511.60

490.00
490.00

3.55
3.63

.00
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845.81
424.00

490.00
490 .00

.00
.99

8. 73

.00
. S9

800.84
506 .00

980.00
980.00

3027.08
3027.98

.00
.90

u;
4.19

.00
.90

902.93
536.00

540.00
540.00

..... 25 .000 17500.00
25.000 17500 .00

3030.76
3031.73

.00
.97

3.67
3.74

.00

961. ss

510.00
510.00

so-t 25.100

17500.00
25.100 17500.00

3033.63
303U1

.00
.88

3 . C· 7

.OC

E-.126 .000 17500.00
26.000 17500.00

3036.88
3037.86

.00
. 97

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3040.95
3041.!5

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4 .·Jb

1. 00

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23.000

r

6.22

17500.00

d. 000 17500.00

8.76

. 9j

L. 10

3.05

..·
. .:.o
:,f 0 '00

400.00

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470 .VJ

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Page

27

r"

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Run Date: 270CT94

Run Time: 16:26:00

!""

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SECNO

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DlfKWS

i0tWI0

4.68
4.48

.00
.80

891.88
400.55

450.00
450.00

>'li' 29.000 17500.00

3051.53
3052.49

.00
. 96

5.1 i
6.06

.00
.96

800.66
445.00

640.00
640.00

~30.000

17500.00
30.000 17500.00

3057.03
3058.04

.00
1.00

5.50
5.54

.00
1.00

1179.96
437 .00

620.00
620.00

~31.000

17500.00
31.000 17500.00

3062.70
3063.67

.00
. 97

5.64

5.6?

.00
.97

1148.50
448.00

680.00
680.00

e.T32 .000 17500.00

32.000 17500.00

3069.32
3070.09

.00
.77

6.62
6.42

.00
.77

1036.01
586.60

835.00
835.00

17500.00
33.000 17500.00

3077.61
3078.41

.00
.80

8.29
8.32

.00
.80

1102.21
632.00

850.00
850.00

34.000 17500.00
34.000 17500.00

3084 .19
3085.18

.00
.99

6.58
6.77

.00
.99

i333.26

6i4 .60

890.00
890.00

ew 35 .ooo 17500.00
35.000 17500.00

3089.13
3089.94

.00
.82

4.93

4. 76

.00
.82

1089.63
490.20

750.00
750.00

36.000 17500.00
36.000 17500.00

3094.20
3095.11

.00
. 91

5.07
5.17

.00
. 91

1015.41
429.70

570.00
570.00

'E>/37 .000 17500.00
37.000 17500.00

3099.85
3100.82

.00
.97

),65

5. 71

.00

1009.94
367 .80

620.00
620.00

e.! 33.000
;.1

'Ell

. 97

Page

28

XLCH

.00
.80

'

'

DlFW5P

FLOODWY1.HC2

3045.63
3046.43

29.000 17500.00

!"''

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Data File:

28.000 17500.00
28.000 17500.00

'EP

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HMVersion: 6.60

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Run Date: 270CT94

HMVersion: 6.60

2.000
2.000
2.000
2.000

PROFILE~
PROFILE~
PROFILE~
PROFILE~

3.000 PROFILE~
CRITICAL DEPTH ASSUMED
3.000 PROFILE'
MINIMUM SPECIFIC ENERGY
3.000 PROFILE, 2 CRITICAL DEPTH ASSUMED
3.000 PROFILE' 2 MINIMUM SPECIFIC ENERGY

CAUTION SECNO'
CAUTION SECNO'

4.500
4.500
4.500
4.500

PROFILE'
PROFILE'
PROfiLE'
PROFILE,

l CRITICAL DEPTH ASSUMED
1 MINIMUM SPECIFIC ENERGY
2 CRITICAL DEPTH ASSUMED
2 MINIMUM SPECIFIC ENERGY

CAUTION SECNO'

6.000
6.000
6.000
6.000

PROFILE'
PROFILE'
PROFILE'
PROfiLE'

1 CRITICAL OEPTH ASSUMED
1 MINIMUM SPECIFIC ENERGY
2 CRITICAL DEPTH ASSUMED
2 MINIMUM SPECIFIC ENERGY

P" CAUTION SECNO'

' CAUTION SECNO'
CAUTION

SECNO~

CAUTION

SECNO~

r" CAUTION

SECNO,
CAUTION SECNO'
CAUTION SECNO'

8.000 PROFILE, 1 CRITICAL 0EPTH ASSUMED
8.000 PROFILE, 1 MINIMUM SPECIFIC ENERGY
8.000 PROFILE~ 2 CRITICAL DEPTH ASSUMED
8.000 PROFILE' 2 MINIMUM SPECIFIC ENERGY

r-. CAUTION
SECNO'
CAUTION SECNO,

J.OOO PROFILE'
9.000 PROFILE'

CRITICAL DEPTH ASSU1,EO
MINIMUM SPECIFIC ENERGY

CAUTION SECNO,
CAUTION SECNO,

13.000 PROFILE'
13.000 PROFILE'

CRITICAL DEPTH ASSUMED
MINIMUM SPECIFIC ENERGY

CAUTION SECNO,
CAUTION SECNO~
CAUTION SECNO,
,- CAUTION SECNO~
~

...

PROFILE' l CR!l!CAL OECTH ASSUMED
PROFILE' 1 MINIMUM SPECIFIC ENERGY
PROFILE' 2 CRITICAL DEPTH ASSUMED
PROfiLE' 2 MINIMUM SPECIFIC ENERGY

15.000 PROfiLE~ 1 CONVEYANCE CHANGE OUTSIDe ACCEPTA6LE RANGE
15.000 PROFILE' 2 CRITICAL ~E~TH ASSUMED
15.000 PROFILE~ 2 MINIMUM S?E~iFIC ENERGY

CAUi!ON SECNO'
CAUTION SECNO,

17.000 PROFILE'
17 .000 PROFILE'

CAUTION SECNO'
• CAUTION SECNO~

""'

14.000
14.000
14.000
14.000

WARNING SECNO'
CAUTION SECNO,
CAUTION SECNO,

r"

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FLOODWYl. HC2

1 CRITICAL DEPTH ASSUMED
1 MINIMUM SPECIFIC ENERGY
2 CRITICAL DEPTH ASSUMED
2 MINIMUM SPECifiC ENERGI

CAUTION SECNO~
CAUTION SECNO~
CAUTION SECNO'
CAUTION SECNO,

r- i:~l~~~ ~fi~~~

~

Dota File:

SUMMARY OF ERRORS AND SPECIAL NOTES

CAUTION SECNO~
CAUTION SECNO~
CAUTION SECNO~
P" CAUTION SECNO~
~

Run Time: 16:26:00

CAUTION SECNO,
CAUTION SECNO~
CAUTION SECNO~
CAUTION SECNO,

10.000
20.000

PROFILE~

PROFILE~

21.000 PROFILE'
21.000 PROFILE~
21.000 PROFILE~
21 .000 PROFILE'

CRITICAL

ASSUMED

GE~TH

MINIMUM SPECiFIC

~NE~Gt

.

CRliiCAL ~·tFiH ASSUi·1fD
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CRiill AL ;[
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1

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Page

29

!""

Run Date: 270CT94
CAUTION

j CAUTION

SECNO~

SECNO~

22.000
22.000

Run Time: 16:26:00
PROFILE~

PROFILE~

HMVersion: 6.60

22.500 PROFILE~ 2 CRITICAL DEPTH ASSUMED
22.500 PROFILE' 2 MINIMUM SPECIFIC ENERGI

!"" CAUTION SECNO'

2o.OOO PROFILE~
CUi ICAL DE PI 'rl ASSUMED
MINIMUM SPECIFIC ENERGY
23.000 PROFILE~
23.000 PROFILE~ 2 CRITICAL DEPTH ASSUMtD
23.000 PROFILE, 2 MINIMUM SPECIFIC ENERGY

: CAUTION SECNO,
CAUTION SECNO,
CAUTION SECNO,

i CAUTION
~~~~~~~ ~~t~~~
SECNO'
l"" CAUTION
' CAUTION
CAUT!ON
CAUTION
l"" CAUTION
CAUTION
CAUTION
r" CAUTION

r

SECNO'
SECNO'
SECNO,
SECNO'
SECNO'
SECNO'
SECNO'
SECNO'

CAUTION SECNO'
CAUTION SECNO'

27.000 PROFILE~ 1
27.000 PROFILE' 2
27.000 PROFILE' 2
28.000 PROFILE,
28.000 PROFILE,
28.000 PROFILE, 2
28.000 PROFILE, 2

FLOODWYl .HC2

Page

30

CRITICAL DEPTH ASSUMED
MINIMUM SPECIFIC ENERGY

CAUTION SECNO~
CAUTION SECNO'

;

Data File:

CONVEYANCE ChANGE OUTSIDE ACCEPTABLE RANGE
CRiiiCAL DEPTh AiSU~IED
MINIMUM SPECifiC ENERGY
CRITICAL DEPTH ASSUMED
MINIMUM SPECIFIC ENERGY
CRITICAL OEPTH ASSUMED
MINIMUM SPECIFIC ENERGY

30.000 PROFILE' 2 CRITICAL DEPTH ASSUMED
30.000 PROfiLE, 2 MINIMUM SPECIFIC ENERGY
CR!i!CAL DEPTH ASSUMED
31.000 PROFILE~
31.000 PROFILE'
MINIMUM SPECTFIC ENE~GY
33.000 PROFILE'
33.000 PROFILE'

CRITiCAL DEPTH ASSUMED
MINIMUM SPECifiC ENERGY

r

,.
""

..
;) J3

Run Date:

270CT94

Run lime: 16:26:00

HHVersion: 6.60

Data File:

FLOODWYl.HC2

Floodway width summary: CANADA DEL 0'0
Profile No. 2

Section Elevation
Nu1ber Increase

~

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'

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,..
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lop
Width

Left Sta
left
Distance
Encroach
From
Station Center

Ki~ht Sta

Center
Station

Dtstance
Right
From
Encroach
Center
Station

-----;:;;;------;:;;----&;;:;;----&2;:;;----622:;;·--;;;;:;o·----;;:;;·--;;;;:;;
2.000
3.000
4.000
4.500
5.000
6.000
7.000
8.000
9.000
10.000
11.000
12.000
13.000
14.000
14.300
14.600
15.000
16.000
17.000
18.000
19.000
20.000
21.000
22.000
22.500
23.000
24.000
24.100
25.000
25.100
26.000
27.000
28.000
29.000
30.000
31.000
12.000
11.ooo
34.000
35.000
36.ooo
37.000

.97
.98
.87
.60
.94
.51
1.00
.23
.50
1.01
.53
.97
.33
-.01
.02
.01
.56
.74
.92
.)9
.88
.98
.60
.95
.87
.95
.99
.90
.97
.88
.97
1.00
.80
.96
1.00
.97
.77
.80
.99
.82
.91
.Si

691.40
560.00
398.00
490.00
591.00
458.00
527.80
439.50
498.00
584.30
576.80
590.00
537.80
485.00
480.00
480.00
402.90
558.00
517.80
625.00
525.00
528.00
372.00
421.00
511.60
424.00
506.00
538.00
611.00
660.00
758.10
615.00
415.00
445.00
437.00
448.00
586.60
632.00
624.60
498.20
429.70
367.80

310.00
251.00
427.00
i\9.00
9UO
28.00
22.20
1!.50
88.00
45.70
53.20
225.00
222.20
iOO.OO
110.00
iiO.OO
251.10
224.00
328.00
365.00
264.00
205.00
220.00
180.00
19.40
167.00
243.00
312.00
274.00
315.00
122.90
305.00
390.00
352.00
46i.OO
576.00
517.4G

63UO
482.60
73.00
74.00
40.00
24.50
34.60
112.50
146.00
75.30
36.80
40.40
32.35
122.60
126.50
126.50
44.75
162.30
467.10
584.55
487.45
297.05
177 .so
30.50
21.10

24S·.4C
283.00

Ll.lij

270.~:.

460.Ci
J97.ls
345.75

743.'ci
:;&2.15
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i\2.75
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14.70
25.00
17.15
54.95
112.15
320.15
231.20
96.40
4s.;·o

"·"

\44.30
733.60
500.00
233.00
13\.00
52.50
56.80
i24.Gj
<>4.00
121.00
90.00
265.40
25U5
222.60
<36.50
236.50
195.&5
356.30
795.10
949.55
i)i.4S

502.05
)Ji.\0
210.50
40.50
221.65
4iU5
331.00
288.70
340.00
140.05
359.95
502.15
672.15
700.:0
672.40
566.10
466.95

57.10
77.40
325.00
416.00
55!.00
433.50
493.20
327.00
352.00
509.00
540.00
54d0
505.45
ob2.40
;;),50
35!.50
355.15
315.70
50.70
40.45
37.o5
230.95
1\4.50
390.50
490.50
36i.35
313.05
519.00
5\6.30
635.00
740.95
560.05
302.85
124.&:,
205.o0
CSi.60
537.9C
603.SJ
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1001.40
o1i.OO
825.00
649.00
6\0.00
486.00
550.00
45i.OO
586.00
630.00
6i0.00
oi5.00
760.00
585.00
590.00
590.00
654.00
762.00
o45.30
990.00
78\.00
733.00
592.00
60i.OO
531.00
591.00
74\.00
850.00
885.00
975.00
881.00
120.00
805.00
797.00
i06.00
1024.00
1104.00
!047.oo
874.00
78i.20

2~.0:.

1!.~3.60

sao.c5

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~014.70

Page

31

r

...

Run Date: 270CT94

P'"FLOODWAY DATA,
•· PROFILE NO. 2

""

""

,.
""

""'

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r

""
""
""

r

STATION
1.000
2.000
3.000
4.000
4.500
5.000
6.000
7.000
8.000
9.000
10.000
11.000
12.000
13.000
14.000
14.300
14.600
15.000
16.000
17.000
18.000
19.000
20.000
21.000
22.000
22. 500
23.000
24.000
24.100
25.000
25.100
26.000
27.000
28.000
19.000
30.000
31.000
32.000
33.000
34.000
35.000
36.000

Run Tue: 16'.26:00

HMVersion: 6.60

Data f i It:

FLOODWYl.HC2

Page

32

CANADA DEL ORO

-------

WIDTH
693.
691.
560.
398.
490.
591.
458.
528.
439.
498.
584.
577.
590.
538.
485.
463.
464.
403.
558.
518.
625.
525.
528.

FLOODWAY ------WATER SUhfAct [~cVh1lON
SECiiON
HEAN
mHOUT Dir-rtRC:NCE
WITH
AREA
VELOCIT 1 FLOODWAY ii.OODWA1
2466.
2228.
2061.
1804.
1906.
27 49.

1770.
2255.

1701.
1728.
2148.
1975.
2196.
1939.
1975.
2113.

421.
512 .
424.
506.
538.
611 .
660.
758 .

2401.
1779.
2012.
1937 .
216i.
1932.
1921.
1730.
2113.
2000.
1786.
2120.
2178.
2264.
2337.
2796 .

415.
445.
437 .
448.

165 J.
1069.
1881.
2064.

372.

6i5.

587 .

632.
625.
4iS .
430.

1933'

21 ~3 .
234 C-.
2896.

2C3J.

L~ 7C.

7.l

' .
' .'
8.5
9. 7

9.2
6.4
9.9
7.8
10.3
10.1
8 .1
a.~

8.0
9.0
5.9
8. 3
7.3
9.8
8. 7
9.0
8.1
9.1
9.1
10.1
8.3
8. 7

; .a

8.3
8.0
7. 7
7. 5
6.3
9 .l

10.:.
8.~

1. J
(;

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7 .s

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8. (;
C.:.

2884.5
2690.7
2898.6
2907.1
29!0. 3
2913.8

mo.o

2927 .2
2932.3
2937 .7
2944.2
294&.3
2954.9
2%0.4
2965.2
2966.3
2966.9

2967.8
2972.6
2975./

2981.9
2986.6
2993.0
3001.8
3008.6
3011.4
3015.0
3023.8
3028.0

3031. a

3034.7
3037.9

30~ i. i
.04o.4
~05i .S
J056.0
:;(;;_<... 7
• 'J! 1.' ••

>v7 0, ~

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3G81.1
:-v· n. ~

2853.5
2889.7
1897.6
2906.2

i .0

1.0
1.0
.;

2901.)

'&

2912.7
2919. 5
2926 .2
29J~.i

'93/' . 2

2943.<
2947 .b
2953. ·j

2i60 .1
2965.2
2966.3
2966.9
29o 7. 2

·'

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1. 0
.5
i .0
.3

.0

.0
.0
.6

.7

2i72.l

2974.8
2-;so. 9
2985. i
2992.0
3001.2
3007 .6
3010.5
3014.;
3022.6
3027. i

3030.8
3033.8

3036. s

3040.;
304\.o

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30 S7. G
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...

Run Date:

270CT94

.., fLOODWAY DATA,
r PROFILE NO. 2
STATION

!""

!""

!""

!""

...

-

Jatj file:

CANADA DEL ORO

------- FLOODWAY ------WIDTH
SECi!ON
MEAN
AREA
VELOCI iY

3&8.

1m.

Normai program termination

!""

...

37 .ooo

HM"~ersior1: 6.6r~:

Run iime: 16:26:00

9.8

WATER SURfACE LEVAIIGN
Y!IHOU DIFFERENCE
fL000WA~
FLOODW i

il!H

i.O

FLOODWI'!.Hl2

r

...

,...

r

I"'

HEC-2 SEC NO.

1
2
3
4
4.5
5

6
7
8
9

I"'

'

10
11

12
13

...

•
•

14
14.3
14.6
15
16
17
18
19
20
21
22
22.5
23
24
24.1
25
25.1
26
27
28
29
30
31
32
33
34
35
36
37

LETTER
DJ
DK
DL
DM
DN
DO
DP
DQ
DR
DS
DT
DU
DV
DW
DX

DY
DZ
EA
EB
EC
ED
EE
EF
EG
EH
EI

COMMENTS
Limit of Study

Wilds Road

Golder Ranch Road Bridge

EJ

EK
EL
EM
EN
EO
EP
EQ
ER
ES

ET
EU
EV
EW
EX
EY

Edwin Road
Pima-Pinal County Line
Limit of Study

'),

FI.JOOD CON1"'ROL STUDY

FOR
CANADA DEL ORO \VASil
CATALINA, ARIZONA

PI1\1A COUNTY FLOOD CONTROL
NOVEMBER 1991

DIS1~1{J(:1'

"'

"'

"'
,..

,..

FLOOD CONTROL STUDY
FOR

CANADA DEL ORO WASH
CATALINA, ARIZONA

j

,.

,.
...
...

"'

Prepared for the
Pima County Board of Supervisors
sitting as the
Flood Control District Board of Directors
Dan Eckstrom
Raul Grijalva
Greg Lunn
Ed Moore
Reg Morrison
Prepared by
The Pima County Department of Transportation
and Flood Control District
Flood Control Planning and Development Division
John M. Bernal
Director

...

"'
,.

November 4 1 1991

TABLE OF CONTENTS
iv

EXECUTIVE SUMMARY
I.

INTRODUCTION

!"'

1

1.1 INTRODUCTION

1

1.2 PURPOSE

4

1.3 OBJECTIVES AND TASKS

6

I"'

!"'

I I . REGIONAL CHARACTERISTICS AND FLOOD HISTORY

.
.
..
.

.

2.1 REGIONAL ATTRIBUTES
. . . .
2 .1.1 Watershed Characteristics
2 .1.2 Watercourse Characteristics
2 .1. 3 Development Along the Watercourse
2.2 HISTORICAL PERSPECTIVES ON FLOODING
2.2.1 Flood History
2.2.2 Golder Dam
2. 2. 3 Drainage Complaints

""
I"'

8

III.

8

. . . .

.

2.3 PREVIOUS STUDIES . . . . .
2.3.1 Phase I ADWR Study
2.3.2 Phase II ADWR Study
2.3.3 Summary of Findings of ADWR Studies

15

2.4 FLOOD WARNING SYSTEM . . .

17

PROPERTIES LOCATED IN FLOODPRONE OR EROSION HAZARD
AREAS
. . . . ·
· · ·
· · · ·

19

3.1 PROCEDURES USED TO DELINEATE FLOODWAY, FLOODPLAIN,
AND EROSION HAZARD BOUNDARIES
. . . . . . . .
3.1.1 Floodway and Floodplain
3.1.2 Erosion Hazard Area

.
.

3.2 ASSESSMENT OF ADEQUACY OF USING THE EXISTING
FLOODWAY, FLOODPLAIN, AND EROSION HAZARD
BOUNDARIES .
.
.
.
.
.
.
3.2.1 Adequacy of FEMA Maps
3.2.2 Adequacy of Existing Erosion Hazard Setback
i

.
""

12

19

19

...

...
I

r

TABLE OF CONTENTS (CONTINUED)

3.3 IDENTIFICATION OF AFFECTED PROPERTIES
...
3. 3.1 Parcels in the Floodway, Floodplain, or
Erosion Hazard Area
3.3.2 Residences in the Floodway, Floodplain, or
Erosion Hazard Area
3.3.3 Summary of Findings and Comparison With 1981
Data
3.3.4 Recent Acquisition Requests from Property
Owners

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3.4 SEVERITY OF EXISTING FLOOD HAZARD

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IV. ANALYSIS OF ALTERNATIVES

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4.1 REMEDIAL ACTION ALTERNATIVES
4.1.1 Floodprone Land Acquisition

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4.2 COST COMPARISON: 1982 ADWR ALTERNATIVES VS. 1991
ACQUISITION
. . . .

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4.3 SUMMARY OF ALTERNATIVES

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4.4 COMPARISON OF FLOODPRONE LAND ACQUISITION NEAR
CATALINA WITH OTHER DISTRICT-WIDE ACQUISITION
PRIORITIES

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V. RECOMMENDATIONS

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VI. REFERENCES

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LIST OF FIGURES

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Figure
Figure
Figure
Figure
Figure

1 Location of Study Reach
2 Floodway and Floodplain Exhibit
3 Aerial Photograph of Study Area
4 Watershed.Map
5 Floodway ,· Floodplain, and Erosion Hazard Boundary
Map

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3
5
9

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LIST OF TABLES
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Executive Summary Table
Table 1 Development in Floodprone Areas
Table 2 Acquisition Costs

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27
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APPENDIXES

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APPENDIX A: 1985 BOARD-ADOPTED PROGRAM CONCEPT: FLOODPRONE
LAND ACQUISITION
APPENDIX B: LISTING OF PARCELS AND DWELLINGS IN FLOODPRONE AREAS
APPENDIX C: DRAINAGE ASSESSMENTS FOR THE BOWERMAN, COLEMAN, AND
BOWERS PROPERTIES

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EXECUTIVE SUMMARY

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The Canada del Oro (CDO) Wash area located near Catalina, Arizona,
offers a rural lifestyle in a small town setting, while providing
the amenities of a large metropolitan area nearby.
Drawn by the
scenic environment, residents settled along the CDO near Catalina
during the late 1950's and early 1970's, prior to the adoption of
floodplain management regulations by the Pima County Flood Control
District (District) in 1974.
It has long been recognized that a large flood on the CDO near
Catalina would have disastrous consequences for
floodplain
residents. During a 100-year or base flood, virtually the entire
valley floor would be inundated.
Although historically few
flooding complaints have been recorded for this area by the
District, and the nature of the complaints has generally not been
serious, the potential for loss of life and extensive damage due
to a major flood in the area is cause for concern.
Working maps showing the floodway and floodplain boundaries in the
study area were first developed by the U.S. Geological Survey in
1979, and were used by the District to regulate development in
floodprone areas. In 1983, the Federal Emergency Management Agency
(FEMA) published the first floodway and floodplain maps, based on
the work maps issued in 1979. The FEMA Flood Insurance Study (FIS)
indicates flow depths of three to eight feet (3-8') above the main
channel, and velocities of 4.6 to 9.7 feet per second (fps) across
the floodway. A general rule-of-thumb is that it is difficult for
an average person to stand in flowing water if the product of depth
and velocity exceeds the numerical value of ten (10) . Based on the
depths and velocities in the FIS, residents of 36 dwellings located
in the floodway will be exposed to extremely hazardous conditions
during a 100-year flood.
The dangers posed by flooding to area residents have been wellknown and widely publicized since the mid-1960's.
Golder Darn,
located approximately four miles upstream of the Lago del Oro Study
Area, was constructed in 1964 to create a large lake as the central
attraction to a planned residential subdivision.
Soon after it
began to fill, the darn was found to be leaking. After determining
that uncertainties regarding dam stability constituted a danger to
life and property in downstream areas, the Arizona State Water
Commission in 1981 ordered that the darn be breached.
Due to the
increased attention focused on the area by the construction of
Golder Darn, even after the darn was breached, the dangers to
downstream residents from a major flood were readily apparent.
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At the request of the Pima County Department of Transportation and
Flood Control District (District), the Arizona Department of Water
Resources (ADWR) in 1981 conducted a two-phase study to address
solutions to the CDO flooding problems near Catalina.
Several
structural and two non-structural alternatives were evaluated.
Based on a cost/benefit ratio, ADWR concluded that three options
were feasible and should be investigated further: 1) constructing
levees to protect the densely-populated western portion of the
floodplain, 2) acquirin~ floodprone properties, and 3) installing
a flood warning system.
Although the flood warning system would
not provide flood control to area residents, it was recommended as
a protective measure to reduce the potential for loss of life and
for incurring flood damage along the study reach .
Beginning in 1983, a flood-warning system was installed along this
reach of the CDO. The National Weather Service, ADWR, the TucsonPima County Department of Emergency Services, and the District
jointly sponsor the ALERT (Automated Local Evaluation in Real Time)
flood
warning
system.
Currently,
two
stream
and
seven
precipitation gages are operating in the watershed upstream of the
study area, providing 1 1/2 to 3 hours warning to area residents.
The District has been actively engaged in acquiring floodprone land
as a means of providing non-structural flood control since 1984,
when voters first approved using bond monies for buying flooddamaged land and for relocating residents of flood-damaged
properties.
As part of a 1985 Board-adopted Floodprone Land
Acquisition Program, several areas were identified as priorities
for acquisition, including the four-mile reach along the CDO near
Catalina, between the Pinal County line and Catalina State Park in
the vicinity of Lago del Oro Parkway.
In 1986, voters authorized
bond funding to acquire improved and unimproved property, the
latter to prevent future flood damages .
On July 24, 1990, a large storm caused flooding along several
watercourses in eastern Pima County, including the CDO near
Catalina. Although the impact of the storm was greater in other
locations, residents' concerns about flooding, which had possibly
been eased somewhat by the absence of serious damage during the
October 1983 flood, were rekindled. Three formal requests for the
District to acquire floodprone land in this area were received
after the July 24 storm, and renewed attention has been focused on
acquiring floodprone land in this area.

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This report was prepared at the request of the Director of the Pima
County Department of Transportation and Flood Control District, to
obtain a current estimate for acquiring floodprone land along the
CDO near Catalina, to aid in evaluating how acquiring property
along this portion of the CDO satisfies the goals of the Floodprone
Land Acquisition Program, and to gage the fiscal impacts of
acquiring floodprone land in this area on the overall acquisition
program.
It is also intended to serve as a guide in evaluating
individual requests from area property owners to purchase
floodprone land.
There are 10 conventional and 26 manufactured homes located in the
floodway, 7 conventional and 39 manufactured homes located in the
floodplain outside the floodway, and 9 manufactured homes located
in the erosion hazard area outside both the floodway and floodplain
throughout the study reach. Projected acquisition costs for land
and improvements are: $4.7 million for the entire floodway (312
acres), $3.3 million for only residentially-developed floodway
property (96 acres), $4.4 million for the floodplain outside the
floodway (244 acres), and $1.1 million to acquire the erosion
hazard area outside the floodway and floodplain (68 acres). The
cost of acquiring the floodway and floodplain is estimated at $9.1
million (556 acres) . Pertinent acquisition data are summarized in
the table following the Executive Summary.
Due to the extremely ·hazardous conditions expected during a 100year flood, exacerbated by a probable loss of roadway access and
the dangers associated with rescue operations, it is recommended
that parcels with habitable structures (dwellings) located in the
floodway be acquired, subject to the availability of funding, for
those property owners who so request it.
As additional funding
becomes available, parcels in the floodplain or erosion hazard area
with dwellings which are not consistent with the Floodplain and
Erosion Hazard Management Ordinance and which are likely to incur
serious damage during a 100-year flood should be acquired next.
Vacant property in the floodway should also be acquired, to
preserve the environmental attributes and hydraulic integrity of
this reach. A detailed listing of recommendations is provided in
the Recommendations Section of the report.
Based on the severity o.f the flood hazards to which residents are
exposed, and the relatively large number of dwellings located in
the floodway (36), the CDO near Catalina should be rated as among
the top of the District-wide Priority 1 listings for acquisition,
together with the Tanque Verde Wash between Bonanza Avenue and
Forty-Niners country Club, property located in the CDO floodway
between La Cholla Boulevard and Overton Road, and the Black Wash
between the headwaters and Ajo Highway.
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Several measures are recommended which will prevent the worsening
of an aleady dangerous situation in this area. Strict enforcement
of floodplain management regulations is needed. Enforcement action
should be pursued as necessary for those dwellings which are
illegally located in hazardous areas, i.e. those constructed or
installed without permits, and after the adoption of the first
Floodplain Management Ordinance, or those constructed or installed
in violation of permit conditions. A monitoring program, including
quarterly field visits and an annual overflight, should be
initiated to ensure compliance with current regulations. Waivers
and variances should not be granted for new construction in
hazardous areas, as the threat posed by flooding is significant;
additionally future costs to acquire the property will likely be
increased if the property is improved.
Finally, due to channel changes which have impacted the floodway
since the original FEMA mapping, it is recommended that the FEMA
floodplain and floodway maps be revised. The FEMA restudy should
be initiated as soon as possible in order to establish the most
accurate flooding and erosion data for evaluating and prioritizing
parcels to be acquired.

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EXECUTIVE SUMMARY
TABLE

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Acquisition Cost for Canada del Oro Wash
Pima County Line to Catalina State Park

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Cqst
Zone

(Dollars x 1000)

Acres

Floodway

$4,663

312

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Floodplain

$4,458

244

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Floodway and
Floodplain

$9,121

556

$3,338

96

$1,047

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Floodway
(with dwellings
only)
Erosion Hazard
Area

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*note: the cost estimate is based on assumed current market values
and contingency costs

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I. INTRODUCTION

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1.1 INTRODUCTION
The Canada del Oro Wash (CDO) along Lago del Oro Parkway near
Catalina provides an attractive setting for those desiring a rural
lifestyle.
Located about 17 miles northeast of downtown Tucson,
the scenic watercourse provides open space needed for equestrian
and other recreational uses, and offers the benefits of living in
a small community, while at the same time offering the amenities
of a larger metropolitan center nearby (Fig. 1).
Residents living in the floodplain and particularly in the floodway
along this reach of the CDO are, however, exposed to very severe
flood and erosion hazards. Many settled along the CDO floodplain
in the late 1960's and early 1970's, before the word "floodplain"
was part of our everyday vocabulary, and prior to the adoption of
federal and local floodplain management regulations. The Federal
Emergency Management Agency (FEMA) in 1979 issued preliminary
floodway and floodplain maps for Pima County, including the study
area, and in 1983 published the first Floodway and Floodplain Maps
and Flood Insurance Study (FIS) for Pima County, based on the 1979
data. When the preliminary data were first made available in 1979,
the dangers to residents were quantified.
Many of the properties and dwellings along this portion of the CDO
are located in the floodway or floodplain (Figs. 2 and 5) as
designated on the 1983 FEMA maps [1].
In the event of a 100-year
flood, most of the valley floor would be inundated, with no
vehicular access to evacuate to safe and higher ground. According
to the FIS, flow depths of three to eight feet (3-8') are likely
above the main channel, with expected velocities of 4.6 to 9.7 feet
per second, depending on channel cross-section configuration.
A
basic rule-of-thumb is that it is difficult for an average person
to stand in water when the product of the flow depth and velocity
exceeds the numerical value of ten (10). Clearly residents' lives
will be in jeopardy should they be caught in the floodway during
a 100-year flood.
Loss of property is a secondary, but very
important concern.

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Although historically there have been few CDO flood-damage
complaints of a serious nature in this area (section 2.2), District
staff as well as residents realize the potential hazard. The Board
of Supervisors formally recognized the hazard in 1985 when bond

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CANADA DEL ORO WAS il, CATALINA AZ..
LAGO DEL ORO STUDY AREA

ARIZONA
FLAGSTAFF

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FIGURE 1
LOCATION OF STUDY REACH

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CAilADA DEL ORO WASH, CATAUNA AZ.
LAGO DEL ORO SnJDY AREA

REGULATORY FLOODPLAIN

~------------------------~

FLOODW AY

STREAM CHANNEL

R_E GULATORY FLOOD ELEVATION

0,)

II!! /11/::::...= ''IJ//ff.
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:::::1//1-~~~~l!tl~

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C ••• • • I I I I I ' I I I I I I I • • • I I I I I I I I •

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AREA OF FLOODPLA IN THAT COULD BE USED
FOR DEVELOPMENT BY RAISING GROUND LE V EL

LINE
LINE

A8
CD

IS THE BASE FLOOD ELEVATION ( 100 YEAR FLOOD) .
18 THE REGULATORY FLOOD ELEVATION ( 1.0 FOOT ABOVE BASE FLOOD ELEVATION. )

SURCHARGE IS NOT TO EXCEED 1.0 FOOT ( FEMA REQUIREMENT ) , OR LESS IF SPECIFIED BY COUNT Y ·

FIGURE 2

SCHEMATIC OF FLOODWAY
AND FLOODPLAIN

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funding of $40 million was approved for the Floodprone Land
Acquisition Program. A priority listing was developed as part of
the adopted program, and the CDO from Catalina State Park north to
the Pinal County Line was identified as a top priority area for
acquisition (Appendix A) .
The Lago del Oro study area, an approximately four-mile reach
extending along the CDO near Catalina, is located in Township 14
South, Range 11 East, and comprises portions of Sections 1, 2, 10,
11, 15, and 22 (Fig. 3).
A brief description of land use and
development in the study area follows.
Most property has been developed for residential use, with the
majority of the dwellings consisting of manufactured homes.
Residences are most heavily concentrated in Section 15, with
Sections 10, 22, and 11 ·containing fewer residences, respectively.
No residential structures are located in floodprone or erosion
hazard areas in Sections 1 and 2. Approximately two businesses are
located in the area. Lago del Oro Parkway, a public road, extends
from the southern end of Section 15 northeast to mid-way in Section
2. Golder Ranch Road Bridge, also publicly-owned, extends across
the CDO in Section 15 and provides all-weather access to some
residents along the eastern side of the CDO Wash.
A privatelyowned airfield runway extends from the northwest corner of Section
11 northeast into Section 2.
Many non-habitable structures such
as storage sheds and animal housing are present.
1.2 PURPOSE
In response to a request by the Director of the Pima County
Department of Transportation and Flood Control District, this
report has been prepared to: 1) provide a 1991 cost estimate for
acquiring floodprone land and associated improvements in the study
reach, 2) aid in evaluating how acquiring land along the CDO near
Catalina satisfies the goals of the Floodprone Land Acquisition
Program, 3) gage the fiscal impacts of acquisition in this area on
the overall Floodprone Land Acquisition Program, and 4) serve as
a basis for responding to individual requests to acquire property
within the study area.
Three formal acquisition requests were
submitted to the District from area property owners after the July
24, 1990 flood.
Additionally, when compared with drainage
assessments for other identified priority acquisition areas, such
as the Black Wash, this report can provide further guidance in
determining the order of acquisition.
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1.3 OBJECTIVES AND TASKS
Specific objectives include:
1. Compile the available history of flooding and flood-related
problems in the study area;
2.

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Identify those properties and residences lying within a
federally-designated floodway or floodplain, and those lying
within the erosion setback area as specified by the Pima County
Floodplain and Erosion Hazard Management Ordinance;

3. Assess the adequacy of using a) the existing FEMA Floodway and
Floodplain maps to analyze existing 1991 conditions, and b) the
current erosion hazard setback for this area as defined in the
Floodplain and Erosion Hazard Management Ordinance;
4. Estimate the cost of acquiring floodprone property (floodway,
floodplain, and erosion hazard areas), including purchasing
conventional dwellings and relocating residents, in accordance
with Pima County Acquisition Procedures;
5. Compare solutions previously offered for the existing flooding
and flood-related problems in the study area to the selected
alternative (acquisition);
6. Evaluate the acquisition of property in this area in context
with overall District-wide acquisition priorities, and with the
Five-Year Floodprone Land Acquisition Program.

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In order to satisfy the objectives listed above,
tasks are identified:

the following

1. Review all documents available for history on flooding and
flood-related problems in the study area.
This includes
historical aerial photographs, reports written previously,
newspaper articles, and drainage complaint and floodplain use
permit files maintained by the District;
2. Prepare aerial and aerial-topographic maps of the study area,
and delineate the floodway, floodplain, and erosion hazard
boundaries on said maps;

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3. Superimpose the assessor's parcel boundary data on the aerialtopographic map;
4.

Identify the number of residential structures on each parcel.
Estimate a) the cost to acquire property in the floodway,
floodplain, and. erosion hazard area, and b) the cost to acquire
only property with residential dwellings which are located in
the floodway ;

5. Identify measures which can be taken to reduce the possibility
of flood or flood-related damage to structures;
6. Compare the costs associated with previously-identified solution
alternatives to the current cost estimate for acquiring
floodprone property .

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II. REGIONAL CHARACTERISTICS AND FLOOD HISTORY

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2.1 REGIONAL ATTRIBUTES

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The CDO flowing through the Catalina area remains one of the few
major watercourses in eastern Pima County which exists mostly in
its natural state.
By offering cultural,
aesthetic,
and
recreational amenities, the watercourse adds to the overall appeal
of the metropolitan Tucson area to visitors and residents alike .
A 1986 study of local riparian areas prepared by the University of
Arizona [2] identified this reach of the CDO as a major extension
of riparian habitat, suitable as a corridor for wildlife movement,
horseback riding, and hiking. Phase 1 of the Eastern Pima County
Trail System Master Plan [3], adopted by the Board of Supervisors
in the fall of 1989, identified this portion of the CDO as a
Primary Trail, and further identified it as a first priority
candidate trail for acquisition.
According to the Plan, "The
network is to expand on the existing and planned river park system
to connect with all major public lands.
Priority selections for
these recreational trails take advantage, where possible, of
locations that offer the community multiple benefits such as flood
control, groundwater recharge, wildlife habitat preservation, and
open space protection."
2. 1. 1 Watershed Characteristics
The headwaters of the CDO
originate on the northern side of the Catalina Mountains at an
elevation of about 8200 feet, just west of Mount Lemmon. Flowing
north down the back slopes of the Catalina Mountains into Pinal
County, the CDO turns gradually northwest and then abruptly to the
southwest, draining towards Pima County and flowing southwest
through the study area, located just south of the Pinal County line
(Fig. 4) .
The contributing watershed area is approximately 63
square miles at the upstream end of the study reach.
The
description which follows was modified slightly from that in the
ADWR Phase I Study [4].
The upstream mountainous areas of the watershed are characterized
by rock outcrops covered by thin soils with ponderosa pine,
juniper, oak, and mountain grasses.
Channel slopes are steep,
averaging 15% to 25%. Continuing downstream through the foothills
transition zone to the lower elevation areas, the vegetation
changes from juniper, oak, mesquite, and mountain brush to desert
trees and brush and cactus.
Channel slope decreases from 12% to
3%.
Alluvial soils in the lower elevation areas consist
predominantly of gravelly and sandy loam.
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FIGURE 4

WATERSHED MAP

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The Catalina residential area along the CDO is similar to other
upstream lowlands areas, although channel slopes are milder,
averaging 1% to 2%. The CDO geologic floodplain in the study area
is well-confined within a valley, and the main channel, consisting
of coarse sandy alluvium, meanders loosely back and forth across
the flat valley bottom.
The vegetation is typical of the low
elevation desert floor around Tucson, with the land adjoining the
main watercourse channel containing medium density mesquite, other
desert trees, and perennial brushy vegetation .
Average annual rainfall varies from about 30 inches up near Mount
Lemmon to approximately"l2 inches in the Catalina residential area.
Snowmelt runoff contributes flow at the upstream reaches of the
watershed, however the CDO near the Catalina area flows only in
response to summer and winter rainfall-generating storms .
2.1.2 Watercourse Characteristics - As mentioned in the previous
section, the CDO at the Pinal County line drains an upstream
watershed of approximately 63 square miles, with a 100-year
discharge of 17,500 cubic feet per second (cfs), according to the
1983 FEMA Flood Insurance Study (FIS) [5].
Traversing the study
area in a northeast-southwest direction, the floodplain is 800 to
1000 feet wide, lying along the base of the western-most fringe of
the Catalina Mountains. The relatively flat valley bottom is wellconfined on both sides: to the east by the relatively steep slopes
of the transition zone Catalina fringe, and to the west ·by lesssteep but still pronounced slopes.
The valley floor is heavily
vegetated, with desert shrubs, grasses, and trees, including
numerous mesquite, prevalent along the floodplain.
The main channel of the CDO traversing the study area is welldefined with a sandy bottom, varying between 30 to 50 feet in
width, and between two to four feet in depth.
The slope of the
valley floor is between 1% to 2 %. For the first mile downstream
of the Pinal County line the main channel is somewhat braided,
however it assumes a more well-defined and single channel section
at the northern end of the airstrip, and continues downstream as
a well-defined channel throughout the study reach.
Near the
shooting range, at the downstream end of the study area, the
channel again assumes a braided profile.
Throughout the study
reach, the channel meanders loosely back and forth across the
floodplain, gradually moving from one edge of the valley floor
across to the opposite edge (Fig. 3).

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According to the 1983 Flood Insurance Study, the 100-year or base
flood water surface elevation varies from three to eight (3-8) feet
above the main channel flow line, and is up to three feet deep over
adjacent floodplain areas. Average velocities in the floodway vary
from 4.6 to 9. 7 feet per second, depending on cross-section
configuration.
According to the ADWR Phase I Study and based on
preliminary calculations, the main channel has a capacity for
between 500 to 2000 cfs, or approximately the 2-year event. Larger
flows, such as 50- and 100-year events, would be expected to
inundate the entire valley floor, causing widespread and severe
damage.
Due to the highly erosive nature of the sandy soils
throughout the channel reach, bed scour and bank erosion are
expected to be significant during a major flood .
A comparison of the 1963 to March 1990 aerial photographs showed
that the main channel has widened slightly and is susceptible to
braiding. With few exceptions, one being near the shooting range
at the downstream end of the study reach, the general lateral
orientation of the main channel has not changed appreciably since
1963.
The shift in channel alignment near the shooting range is
discussed in more detail in section 3.2.1. In three locations the
channel has changed from a very-braided to a more-confined
configuration:
near the northern end of the airstrip in section
2, near the Golder Ranch Road bridge in section 15, and at the
southern end of the study reach just upstream of the shooting
range.
2 .1. 3 DeveloPment Along the Watercourse
Prior to 1960, the
community of Catalina stretched mostly along the east side of the
Tucson-Florence Highway, with little residential development along
the CDO.
By 1960, the Tucson metropolitan area population had
quadrupled in 20 years, from 58,000 in 1940 to 243,000 [6].
The
sparsely-populated Catalina area offered a rural and scenic living
environment located only 15 miles from metropolitan Tucson and its
amenities, and residents began to settle along the floodplain of
the CDO near Catalina in the late 1960's.
Two of the earliest
platted subdivisions were recorded in 1971 and early 1972: Ranch
Acres Estates and Chaparral Estates No. 2, located in the southwest
and northwest quarters of section 15, respectively.
Unregulated residential development occurred along the floodplain
until the mid 1970's, when the Pima County Floodplain Management
Ordinance was adopted and enforced [7].
Written policy in 1980
established erosion hazard setbacks along major watercourses,
including the CDO [8]. By 1983, when the first FEMA floodplain and
floodway maps for this area were published, much of the development
present today was already established.
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Since 1983, develop~ent in and adjacent to the CDO floodplain has
been closely regulated by the Pima County Floodplain Management
Ordinance, since amended and renamed the Pima County Floodplain and
Erosion Hazard Management Ordinance (9].
The Ordinance has
prohibited residential development in the floodway, and requires
that, for any habitable* structure constructed in the floodplain,
the finished floor elevation must be elevated at least one foot
above the 100-year water surface elevation.
The Ordinance also
prohibits
constructing structures designed for human habitation
where the product of the depth of flow in feet, d, times the square
of the velocity, in feet per second, exceeds 18
(dv 2 > 18) for
greater than 30 minutes, and where surrounding floodwater depth is
greater than three feet.
Based on the provisions of said
Ordinance, many existing residential structures would not be
permitted by current regulations.
2.2 HISTORICAL PERSPECTIVES ON FLOODING

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Mere mention of the words "flood control'' is likely to raise the
interest, if not the ire, of residents along the CDO in the study
area.
Having settled along the watercourse before floodplain
management practices were recognized and publicized, residents may
wonder why they weren't made aware of the dangers of buying and
settling along the wash, or they may doubt the possibility that
such a big flood could occur along the study reach. Some property
owners are unhappy when they become aware of current floodplain
management regulations which prohibit or regulate construction in
the floodplain and erosion hazard areas. Some resent regulatory
agencies for causing the demise of Golder Dam, which was viewed by
local residents as a flood control facility, although it was not
designed for this purpose and was, in fact, a hazard, as discussed
in section 2.2.2 below. Based on a historical perspective, it is
clear that no easy solution exists to the flooding problems along
the CDO near Catalina.
2.2.1 Flood Historv - The only comprehensive study conducted to
date to assess potential solutions to CDO flooding problems in this
area, a two-phase study completed by the Arizona Department of
* A "habitable structure" is one which is designed for human
habitation full or part-time, and includes commercial as well as
residential buildings.
Because only a handful of the habitable
structures located in the study area are used for commercial
purposes, the words "habitable" and "residential" are used
interchangeably.
The words "residence" and "dwelling" are also
used interchangeably.
12

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Water Resources (ADWR) in March 1982 [ 4, 10], found no recorded
flood flow information for the study reach prior to 1960. Details
of the ADWR study are provided in section 2.3.
No incidents of
flood damage to residential property were recorded from the
beginning of the reach development in the early 1960's to the ADWR
report in 1982.
Before 1980, several instances of water release
from Golder Darn, l"ocated 4 miles upstream, caused bank erosion and
traffic disruption at dip crossings. A December 1978 storm caused
significant flow in streams draining the Catalina Mountains, but
no damage occurred in the Catalina area.
The storm produced
significant runoff above Golder Darn only and the darn contained the
discharge. No streamflow gauges existed in the area at that time .
During the October 1983 flood, the study area did not experience
the brunt of the impact as compared to other major watercourses in
Pima County. Bank erosion widened the existing main channel in the
study area by amounts varying from 10 to 150 feet, with much of the
reach experiencing relatively little widening. Aerial photographs
dated October 2, 1983, indicate that direct erosion damage to
residences occurred at only one location, where bank erosion near
Trotter Road left a manufactured horne overhanging the channel bank.
That manufactured horne has since been removed.
Erosion also
damaged roadway dip crossings and drainage structures, disrupting
access to the area.
Channel bed relocation occurred in only one
place and did not result in damages.
Areas adjacent to the main
channel were subject to inundation at locations where the channel
capacity was exceeded, particularly at major channel bends.
The
District received no reports of damage to residences due to
flooding, but the overbank inundation undoubtedly inconvenienced
residents and may have damaged structures.
2.2.2 Golder Darn - Golder Darn, located along the CDO about four
river miles upstream of the Pima-Pinal County line, was constructed
in 1964 to form a re·creational lake which would be the central
attraction to a planned subdivision.
The subdivision was never
constructed, however the darn, 130-feet high and earth-filled with
a storage capacity of about 9500 acre-feet, has been surrounded by
controversy since it was built .
Because the lake was designed to remain full at all times for
recreational purposes, it was designed with a very minimal outflow
structure (one 24-inch culvert) and no emergency spillways. It is
also important to note that as the lake was designed to remain full
at all times, no flood control would be provided. However, because
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the owner (Lloyd W. Golder, III) was unable to keep the lake full
behind the dam, it did provide some capacity for retaining
floodwater, as smaller flows were impounded behind the dam and were
prevented from continuing downstream.
Leakage under the dam was discovered almost immediately after the
reservoir started filling, and in 1966 the dam was declared unsafe
by the Arizona Highway Department. Repairs were ordered, however
attempts to repair the dam failed. The leakage continued, and the
dam was again declared unsafe in 1972 by the Arizona Water
Commission Office of Dam Safety. When a large storm caused water
to rise 75 feet behind the dam in February 1979, dam safety
concerns were again raised and a review was initiated.
It was
subsequently determined that the dam posed a serious flood hazard
to downstream residents, due to the likelihood of catastrophic
failure during a large flood.
The cost to modify the dam was
estimated at $1.6 million.
Controversy arose when some experts
reported that, due to· geotechnical considerations, the dam could
never be made safe, and should be breached. Downstream residents
contended that the dam should be repaired or modified to provide
flood control benefits. The Arizona State Water Commission ordered
the dam breached, and between May and July of 1980 a large notch
was cut in the dam [11].
2.2.3 Drainage Comolaints -All drainage complaint files currently
available in the District's Floodplain Management office, i.e.
since 1979, were reviewed.
The majority of complaints included
problems not directly attributable to COO flooding, such as minor
grading complaints, dumping in the main COO channel, sheds or other
accessory structures placed in the floodplain, and minor roadside
and roadway drainage problems. Some complaints about bank erosion
along the COO were recorded, however only in one instance was a
residential structure threatened, when a manufactured home was left
overhanging the main CDO channel bank as mentioned in section 2.2.1
above.
The most serious of the complaints, in Section 10, regarded
sediment inundation of a building site from a steep tributary wash
draining into the COO from the east. This report does not address
the acknowledged severe drainage and sediment deposition problems
resulting from tributary flow down the steep slopes along the
western fringe of the Catalina Mountains, but rather addresses only
those problems directly attributable to COO flooding. Finally, it
is important to note that this office has only a record of
complaints that were formally filed with the District's Floodplain
Management Section.
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2.3 PREVIOUS STUDIES

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In response to concerns raised by the construction of and
subsequent leakage from Golder Dam,
studies were conducted
regarding the benefits provided by and integrity of the dam.
These studies were briefly mentioned in subsection 2.2.2. The 1983
Federal Emergency Management Agency Flood Insurance Study (FEMA
FIS)
included mapping the 100-year floodplain and floodway
throughout the study area, and is discussed in more detail in
section 3.2.
The FEMA study did not account for the presence of
Golder Dam.
Under the provisions of Arizona Revised Statutes (A.R.S.) 45-2309,
since renumbered to 48-3617, the Pima County Flood Control District
in 1980 requested assistance from the Arizona Department of Water
Resources (ADWR) to find a solution to flooding problems along the
CDO near Catalina. In response to this request, a two-phase study
was conducted by ADWR: Phase I covered channelization and levee
options, and nonstructural alternatives; Phase II addressed the
feasibility of constructing a dam upstream on the CDO to provide
flood control benefits to downstream residents. These studies are
summarized below .
2.3.1 Phase I ADWR Study, March 1982 - Three structural and two
non-structural alternatives were evaluated with the objective of
minimizing the cost/benefit ratio for each potential solution. The
three structural alternatives, Plans A, B, and C, were limited to
channelization and levee options, as described below:
a) Plan A: Channelize the entire reach (3.1 miles), at a total
project cost of $12.4 million for 100-year protection.
b) Plan B: Channelize only the densely-developed areas (2.1 miles),
at a cost of $9.05 million for 100-year event protection .
c) Plan C: Construct two earthen levees along the western side of
the CDO to prevent inundation of the more densely-populated western
floodplain,
at a total cost of $5.2 million for 100-year
protection.
The two non-structural alternatives consisted of:

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d) Purchasing the
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floodplain

and floodway,

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e) Installing a flood warning system.
Although during a large
flood this would not reduce major structural damage, it would
reduce the possibility of loss of life. Installation costs were
estimated at $100,000.
The ADWR study concluded that structural alternatives were
preferred because floodwater would be controlled while leaving the
residential development largely in place.
Only channelization
alternative C had a favorable cost/benefit ratio, and it was only
marginally favorable. . Acquisition was considered disruptive to
residents due to relocation considerations, although it too had a
favorable cost/benefit ratio.
It was recommended that a flood
warning system be installed.
Due to high cost, extensive environmental impacts, and alterations
to the hydraulic and sediment transport regimes of the watercourse,
structural alternatives were not pursued.
In the ten years since
the completion of the ADWR study, the importance of preserving
natural riverine environments has become increasingly recognized,
at both a local and federal level.
One result is that under
provisions of the Clean Water Act, a 404 Permit would be required.
This is often a lengthy and expensive process, making the
structural alternatives more costly than previously anticipated.
Another result is that relocation of residents from acquired
floodprone lands is viewed not as disruptive but as beneficial for
property owners and the general public, as evidenced by the
increasing numbers of acquisition requests received by the District
since 1986.
As mentioned in the Executive Summary, and discussed in more detail
in sub-section 4.1.1 of this report, the estimated 1991 cost to
acquire the floodway and floodplain is $9.1 million, which is
double the 19 81 cost estimated in the ADWR report.
Although
insufficient documentation was provided in the ADWR report to
ascertain how that number was obtained, two significant items were
noticed: 1) the 1981 cost estimate was based on acquiring 380 acres
compared with 556 acres in 1991, and 2) it was assumed in the ADWR
report that vacant land would be acquired through an easement at
50% of the fee value of the land.
It is unclear how it was
determined by ADWR that 380 acres would need to be acquired .
2.3.2 Phase II ADWR Study, March 1982 - The feasibility of using
a floodwater retarding structure (i.e., a dam) to reduce flood
hazards to area residents was assessed .
Two specific locations
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were evaluated: A) Brave Bull Ranch, located just downstream of
the Pima/Pinal County line, and B) the original Golder Dam site.
Modifications to the existing Golder Dam needed to provide
protection for the 100-year event were also analyzed.
It was determined that a new dam at Brave Bull, at a cost of $22
million, would eliminate residential flood damage for the 100-year
flood. Repair of and modifications to Golder Dam, at a cost of $6
million, would reduce flood discharge in the affected residential
areas by only 10 percent; additional floodplain management or
structural improvements would be required to provide a greater
level of flood protection.
The cost/benefit ratios of both
alternatives indicated they were not economically justifiable.
2.3.3 Summary of Findings of ADWR Studies - Several alternatives,
including channelization, levee, and dam options, were evaluated.
Of the three channelization and levee options analyzed, only one,
constructing
levees
to
protect
the
most-densely
populated
residential area on the west side of the CDO, had an economicallyjustifiable cost/benefit ratio. Of the two dam options, only the
Brave Bull dam offered flood protection for the 100-year event,
however both dam options had cost/benefit ratios which were
unjustifiable. Acquiring floodprone land appeared to be a viable
alternative requiring further study.
It was recommended that a
flood warning system be· installed.
2.4 FLOOD WARNING SYSTEM

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In response to concern about flooding in the area, and based on an
intergovernmental agreement between ADWR, the National Weather
Service (NWS), and the District, the ALERT project <sutomated~ocal
§valuation in Beal Iime) was started in 1983 to provide advanced
storm monitoring and early warning to residents along the CDO near
Catalina.
The ALERT system is a telemetric, electronic system
which senses and transmits precipitation and stream gage data via
radio frequency signals to three base stations, where they are
received, processed and stored in computers.
Several stream and precipitation gages were installed in the CDO
basin in both Pinal and Pima counties in the spring of 1983.
At
present, two stream and seven precipitation gages are operating in
the watershed upstream of the study area. Data from the rain gages
provide early warning of the possibility of flooding, as well as
the relative magnitude of flooding to expect; data from the stream
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gages confirm the severity of flooding.
Although the District is
not authorized to issue weather advisories or initiate evacuation
notices to the general public, the District does provide technical
support to the National weather Service and the Tucson/Pima County
Department of Emergency Services, both of whom are authorized to
do so [6] .

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III. PROPERTIES LOCATED IN FLOODPRONE OR EROSION HAZARD AREAS

3.1 PROCEDURES USED TO DELINEATE FLOODWAY, FLOODPLAIN, AND EROSION
HAZARD BOUNDARIES

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The most
recently available aerial photographic map with
topographic contours, based on McLain data from 1984 and 1985, was
used as a base map.
Assessor's parcel boundary information was
superimposed. According to Rick Lyons, Appraisal Supervisor in the
Assessor's Office, the Assessor's maps are current to at least
January of 1991.
The floodway, floodplain, and erosion hazard
boundaries were obtained using the methods described below, and
were added to the base map (Fig. 5) .
3.1.1 Floodway and Floodplain- The CDO near the Catalina area was
mapped as part of the original FEMA Flood Insurance Study (FEMA
FIS), initiated in the late 1970's. Based on this study, FEMA in
1983 issued Federal Insurance Rate Maps (FIRMs) and Floodway Maps
which
delineate
the
floodplain
and
floodway
boundaries,
respectively.
These boundaries were used for this study.
Floodplain limits were obtained from FIRM panel numbers 445 B, 465
B, and 1035 B, and floodway limits were obtained from Floodway Map
panel numbers 3 A,B and 4 A,B.
Sub-section 3.2.1 discusses the
adequacy of using the 1983 FEMA FIS floodway and floodplain limits.
3.1.2 Erosion Hazard Area - Per Article XII of the Pima County
Floodplain and Erosion Hazard Management Ordinance No. 1988-FC2,
the building setback along this reach of the CDO Wash is twohundred and fifty (250) feet.
According to Article IV of the
referenced Ordinance, the setback is measured " ... from the top
edge of the highest channel bank or the edge of the base flood
water surface elevation, whichever is closer to the channel
centerline." In this case, the setback is measured from the edge
of the highest channel bank, that primary channel bank adjacent to
the sandy wash bottom.
Sub-section 3.2.2 discusses the adequacy
of using this definition of erosion hazard area.
3.2 ASSESSMENT OF ADEQUACY OF USING THE EXISTING FLOODWAY,
FLOODPLAIN, AND EROSION HAZARD BOUNDARIES
A visual inspection of Fig. 5 shows five or six locations where the
floodway cuts through the main CDO channel, and one location where
the CDO main channel lies entirely outside the floodway.
The
former occurs throughout the study reach where the FEMA maps show

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the main channel centerline juxtaposed with the edge of the
floodway boundary, and the latter occurs at the downstream end of
the study reach, near the shooting range.

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3.2.1 Adeauacv of FEMA Maos - Two factors which are most likely to
cause significant changes in the location of the floodway and
floodplain along this reach of the CDO are major flood events and
man-made changes.
Because a reference in the 1'983 FIS indicated
the channel geometry cross-sections were surveyed in 1976, aerial
photographs were examined from 1974, the closest date to 1976
readily available. It was determined that the main channel of the
CDO in 1974 corresponds with the channel centerline as shown on the
FEMA FIRM and Floodway maps.
An examination of the historical
aerial photographs indicates that at the locations where the
floodway cuts through the main channel,
grading
(probably
unpermitted) has caused the channel location to shift outward
slightly. No structures are impacted by these changes. Near the
shooting range at the downstream end of the study reach, the
original channel has been diverted to the north approximately 400
to 600 feet (also probably unpermitted)
This diversion has also
been away from all structures.
The designed man-made change having the greatest impact in the area
was the construction of the Golder Ranch Road bridge at the Golder
Ranch Road alignment in 1988.
Spanning 486 feet, the bridge was
designed to convey the 100-year flow through the bridge opening
while allowing the upstream water surface elevation to rise no more
than one foot.
The 'current FEMA Floodplain and Floodway Maps,
based on the original study published in 1983, do not account for
the bridge.
As mentioned previously in section 2.2.1, the October 1983 flood,
although having less of an impact on the study area than on other
major watercourses in Pima County, did result in channel widening
in selected locations, and resulted in one change in channel
location, however the overall impact on the mapped floodway and
floodplain was not significant.
Other floods occurring between
1976 and the present have impacted the Catalina area to a lesser
extent.
Based on this qualitative review of the impact of large floods and
man-made changes since the original FEMA mapping, it was determined
that, although some changes have occurred to the channel geometry
which would impact the original floodway and floodplain boundaries,
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the existing delineations are adequate for the purposes of
generating a cost estimate to acquire floodprone areas along this
reach of the CDO. It is likely that the referenced channel changes
would result in some dwellings being flooded which were not
previously flooded; and some dwellings which were flooded before
the channel changes might not be flooded now. However the overall
number is not expected to change significantly.
Channel changes caused by major floods since 1979 are not
sufficiently significant to warrant a FEMA restudy, however, when
considered in conjunction with channel widening and grading changes
caused by installing the Golder Ranch Road bridge, and grading at
other locations along the main channel, a FEMA restudy of the
floodplain and floodway is warranted.
3.2.2 Adequacy of Existing Erosion Hazard Setback - The erosion
hazard setback as specified in the Floodplain Management Ordinance
is more ideally suited for washes with a straight alignment than
for meandering streams, such as the CDO near Catalina.
Although
the overall alignment of the geologic floodplain is relatively
straight, the main low-flow channel forms pronounced meanders in
some reaches and is braided in other areas, indicating the dynamic
nature of the watercourse. Given the highly erodible nature of the
soils in the area, the main channel location would be expected to
change in several areas in response to a large flood .
The changes to the main channel resulting from the October 1983
flood, however, were not as great as would be expected. Comparison
of 1963 and 1990 aerial photographs indicated little overall change
in the plan form of the main channel, except where man-made changes
occurred, as mentioned in sub-section 3.2.1.
No earlier aerial
photographs of the study area were found. Besides the October 1983
flood, no large flows have been recorded for this area since 1963.
Because the erosion hazard setback is relatively large, 250 feet
from the main channel bank, and residences must be placed outside
this setback, the existing setback is adequate for the purposes of
this study.
3.3 IDENTIFICATION OF AFFECTED PROPERTIES

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For the purposes of this study, an affected parcel or property is
one which lies partly or wholly within the 100-year floodplain,
floodway, or erosion hazard area as delineated on Fig. 5.
Three
primary tasks aided in identifying affected properties and the
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degree to which they are impacted: 1) a list was compiled of all
parcels which are located wholly or partly within the floodway,
floodplain, or erosion hazard area; 2) because most land in the
area is vacant or supports residential use, it was necessary to
determine if a parcel is vacant and, if not, the number and type
of residential structures (conventional or manufactured home)
located on affected properties and within affected areas; and 3)
the drainage complaint files for this area were reviewed.
Data
assembled to complete item numbers 1 and 2 above are listed in
Appendix B.
3.3.1 Parcels in the Floodway, Floodplain, or Erosion Hazard Area
To identify the location of a parcel with respect to floodprone
areas, the floodway, floodplain, and erosion hazard areas are
assumed to be separate and distinct from each other.
That is, a
parcel classified as lying within the floodway only lies entirely
in the floodway.
A parcel classified as lying within the
floodplain only is entirely in the floodplain and not in the
floodway or erosion hazard area.
Similarly, a parcel classified
as lying within the erosion hazard area only is outside the
floodway and floodplain.
A parcel which lies partly in the
floodway and partly in the floodplain is considered as being in the
floodway and floodplain, and so on.
3. 3. 2 Residences in the Floodwav, Floodplain, or Erosion Hazard
Area - The method used to estimate the cost of acquiring property
requires knowing how many residential structures are on the
property, if they are considered conventional or manufactured
homes, and whether they are owner-occupied or leased. These data
were obtained from the Assessor's Office, and are current as of
January, 1991 (Appendix B).
Although a parcel may lie partly
within the floodplain or floodway, the dwelling may be located
outside of the floodprone areas ( floodway or floodplain, and
erosion hazard area) .
It was assumed that only land and
conventional dwellings lying within floodprone areas would be
acquired.
The most recently available aerial photograph (March,
1990) was checked to . see if the dwelling is located in the
floodway, floodplain, or erosion hazard area .
3.3.3 Summary of Findings and Comparison With 1981 Data - Table 1
on page 27 shows the distribution of property and dwellings within
the floodway, floodplain, and erosion hazard areas, by section.
There are 10 conventional and 26 manufactured homes located in the
floodway, 7 conventional and 39 manufactured homes located in the
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floodplain outside the floodway, and 9 manufactured homes lvcated
in the erosion hazard area outside both the floodway and floodplain
throughout the study reach.
Comparing these with the 1981 data from the ADWR report shows that
the number of conventional homes in the floodway and floodplain
has decreased slightly, from 20 to 17, while the number of
manufactured homes has almost doubled, from 37 to 65.
Comparing
1980 and 1990 aerial photographs shows that about 10 additional
manufactured homes are located in the floodway, and approximately
18 are located in the floodplain outside the floodway.
A review
of the District's floodplain use permit files has been initiated,
and District staff will conduct a field investigation to determine
how many of these buildings are in fact residential dwellings.
Staff will also investigate whether the buildings were constructed
prior to the adoption of 1) the first local Floodplain Management
Ordinance in 1974, or 2) the first FEMA Floodway and Floodplain
maps in 1979. Enforcement action will be pursued as appropriate.
3.3.4
Recent Acquisition Requests from Property Owners - Three
formal requests to purchase floodprone properties in this area have
been submitted to the District within the past year: one in section
11, for parcel number 222-32-007 (Coleman); and two in section 15,
for parcel numbers 222-38-0400 (Bowers), and 222-38-039 (Bowerman) .
Both the Coleman and Bowers parcels have dwellings located in the
floodway
(one
conventional
and
two
manufactured
homes,
respectively, see Fig. 5). The Bowerman parcel is unimproved, and
is outside of but adjacent to the floodway.
The western third of
the parcel is located in the floodplain, and the remainder is in
the erosion hazard setback. District staff has completed drainage
assessments on each parcel (Appendix C) .
Staff recommends
acquiring the Coleman and Bowers properties.
3.4 SEVERITY OF EXISTING FLOOD HAZARD

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Should a large flood occur on this portion of the CDO, the severity
of the flood hazard to which residents will be exposed cannot be
over-emphasized. The hydrodynamic force of rapidly flowing water,
expected large-scale channel bed and bank erosion, and flooded
roadways which are impassable to conventional vehicles will result
in dangerous evacuation conditions at best.
In addition to the
threat of loss of life is the expected loss of millions of dollars
of property and associated improvements.

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According to the original FEMA Flood Insurance Study, average flow
depths vary between three to eight feet above the main channel
bottom, and flow velocities vary between 4.6 to 9.7 feet per second
across the floodway.
Because an average person would have
difficulty standing in three-foot deep water flowing at a velocity
of four feet per second, it is apparent that at the expected depths
and velocities, rescues would be difficult, and residents caught
in the river valley during flooding would be exposed to lifethreatening conditions.

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IV. ANALYSIS OF ALTERNATIVES

4.1 REMEDIAL ACTION ALTERNATIVES

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Based on the results of the ADWR studies summarized in sections
2.3.1 and 2.3.2, two alternatives were identified for further
study: 1) constructing levees to protect the more-densely populated
western side of the floodplain, and 2) acquiring floodprone land.
A third alternative not considered previously is installing flooddamage mitigation measures to existing structures located in the
floodprone areas ("floodproofing").
To be consistent with the Board-adopted Acquisition Program
(Appendix A), and due to the disruptive environmental impacts which
would result from constructing major levees along the western
floodplain, the levee option was not investigated further in this
study.
"Floodproofing" measures were also not investigated
further, as follows. According to Article IX, Section B.2.g of the
Floodplain and Erosion Hazard Management Ordinance, structures
designed for human habitation are only permitted where the product
of the flow depth d, in feet, times the square of the flow velocity
v, in feet per second, of the surrounding floodwaters does not
exceed 18 (dv' ~ 18) for more than 30 minutes, and the surrounding
floodwater depth is no greater than three feet. It is likely that
flow depth and velocity would exceed the dv' criterion for many if
not most of the structures located in the floodway and floodplain.
Due to safety concerns, "floodproofing" measures are not feasible
in this area.

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Since the early-to-mid 1980's, both in Pima County and across the
country, non-structural alternatives have been gaining prominence
over structural flood control alternatives as a means of mitigating
the impacts associated with damaging floods.
In May 1986, voters
authorized $20 million in bonds to acquire floodprone lands,
including acquiring improved and unimproved property to prevent
future flood damages.
As part of the documentation prepared for
the bond acquisition program, locations were identified based on
a priority system, and the CDO near Catalina was rated as a first
priority candidate for acquisition.

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4 .1 .1 Floodprone Land Acguisi tion - Acquisition costs for the
floodway, floodplain, and erosion hazard areas were based on
preliminary estimates provided by the Property Management Division
staff of the Pima County Department of Transportation and Flood
Control District.
As mentioned previously, Table 1 lists the
number of dwellings in floodprone areas and the acreage of
floodprone land by.section. Table 2 lists the cost to acquire the
floodway, floodplain, and erosion hazard area, also by section, and
the cost to acquire only floodway properties with residential
dwellings. Projected acquisition costs are $4.7 mi~~ion for the
entire f~oodway, $4 . 4 · mi~lion for the f~oodp~ain outside the
f~oodway,
and $1.1 million to acquire the erosion hazard area
outside the floodway and floodplain. The cost of acquiring the
floodway and floodplain is estimated at $9.1 mil~ion.
The
estimated cost to acquire only floodway properties with dwellings
is $3.3 million .

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TABLE 1
Canada Del Oro Wash, Pima County Line to Catalina State Park
F1oodprone Areas and Development, T11S, R14E
SECTION
1

2

10

11

15

22

Total

34
21
11

91
60
12

44
33
8

26
10
5

60
64
18

57
56
14

312
244
68

10

12

6

8

9

12

21
21
21

14
11
12

68
43
51

27
20
25

152
109
130

3C/1M5
2C/9M
0

1C/3M

0

0
0
0

22M
1C/26M
9M

6C
4C
0

10C/26M
7C/39M
9M

6
9

8
11

10
10

19
21

5

57

7

68

AREA, acres
Floodway
Floodplain'
Erosion Hazard'
PARCEL$
Total #'
Floodway'
Flo.odplain'
"-'

'-'

DWELLINGS
Floodway
Floodplain
Erosion Hazard

0
0

0
0

UNIMPROVED PARCELS
Floodway'
Floodplain'
1
2
3
4
5

9

10

Acces in floodplain outside floodway
Acres in erosion hazard area outside floodway and floodplain
The total number of parcels which contain a portion lying in the FW, FP, or EHA
A parcel was considered lying in the FW/FP if any portion of the parcel is in the FW/FP
M = manufactured, C = conventional

,

. 1

-,

1

,

1

1

,

.1

1

I

1

"

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1

1

1

1

1

1

1

TABLE 2
Estimated Acquisition Costs
Canada Del Oro Wash, Catalina
In Dollars XlOOO
All values include land and conventional dwelling costs.
not acquired by the District.

Manufactured homes are generally

SECTION
1

2

10

11

15

22

Total

Floodway

$170

$273

$705

$325

$1,930

$1,260

$4,663

Floodplain'

$105

$180

$840

$50

$2,263

$1,020

$4,458

N

~

Floodway
(with
dwellings
only) 2

Erosion
Hazard
Area'

0

0

$607

$220

$1,481

$1,030

$3,338

$55

$36

$80

$25

$711

$140

$1,047

1 Areas in floodplain outside floodway
2 Areas in floodway with dwellings only (does not include vacant land)
3 Areas in erosion hazard area outside of floodway and floodplain

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4.2 COST COMPARISON: 1982 ADWR ALTERNATIVES VS. 1991 ACQUISITION
Cost estimates for alternative solutions to flood-related problems
along the study reach are as follows:

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(a) Channelize entire reach
(3.1 miles)
·

$12. 4 million
1981 dollars

(b) Channelize densely-developed areas
(2.1 miles)

$9.05 mil.l.ion
1981 dollars

(c) Construct levees along west side only
through densely-developed areas
(2.0 miles)

$5.2 mil.l.ion
1981 dollars

(d) New Dam at Brave Bull

$22 mil.l.ion
1981 dollars

(e) Repair and Modify Golder Dam*

$6 mil.l.ion
1981 dollars

(f) Acquire Floodway and Floodplain

$4.5 mil.l.ion
1981 dollars

(g) Acquire Floodway
Acquire Floodplain
Acquire Floodway and Floodplain
Acquire only Floodway Property
with dwellings
Acquire Erosion Hazard Area

$4.7 mil.l.ion
$4.4 mil.l.ion
$9.1 mil.l.ion

* This cost estimate would reduce flood peak discharge in the
residential areas by only 10% for the 100-year flood.
Costs of
additional structural mitigation were not calculated.

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$3.3 mil.l.ion
$1.1 mil.l.ion
1991 dollars

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While the acquisition cost estimate based on 1991 dollars cannot
be directly compared to the estimates for remedial action based on
1981 dollars, relative comparisons can be made.
As found in the
1982 ADWR studies, the cost of providing 100-year flood protection
via structural options is very high.
Only alternative (c) ,
constructing levees to protect the western side of the floodplain
at a cost of $5.2-million, had a justifiable cost-benefit ratio.
Alternative (f), acquiring land in the floodway and floodplain for
$4.7
million,
also
had
a
favorable
cost-benefit
ratio.
Alternatives costing substantially more than $5 million had
unfavorable cost-benefit ratios.
Also noteworthy is that the estimated cost to acquire the entire
floodplain in 1991 dollars is twice that in 1981 dollars. Reasons
for this discrepancy are not entirely clear as documentation was
not provided in the 1982 ADWR report, however two likely causes
are: 1) the 1981 cost estimate included acquiring 380 acres
compared with 556 acres in 1991; and 2) it was assumed in the ADWR
report that vacant land would be acquired through an easement at
50% of the fee value of the land.
It is unclear how it was
determined that 380 acres would need to be acquired.
In addition to these two primary causes for the large variability
between the 1981 and 1991 acquisition cost estimates,
two
additional contributing factors include: 1) higher values for both
land and improvements in 1991 as compared to 1981, and 2) the
larger number of dwellings in the floodway and floodplain in 1991:
20 conventional and 37 manufactured homes in the floodway and
floodplain in 1981 versus 17 conventional and 65 manufactured homes
in 1991.
4.3 SUMMARY OF ALTERNATIVES

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Installing flood damage mitigation measures
would not be
appropriate in the study area. As mentioned in section 4.1, the
expected flow depths and velocities would exceed the criteria
specified in the Floodplain Management Ordinance, for many if not
most of the dwellings in the floodplain and floodway.
Therefore
most of these structures would not be allowed.
For cases in which these criteria are satisfied, flood damage
Should a major flood
mitigation measures could be installed.
occur, residents might be able to evacuate before the worst
flooding occurs, based on information obtained from the flood
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warning system, which can provide up to 1 1/2-hours warning based
on stream gage data, and up to 3-hours warning based on rain gage
data.
During a major flow, roadway access to the area would be
difficult.
Evacuation by helicopter might be possible, but would
be dangerous at best. Due to overriding concerns about residents'
safety, installing "floodproofing" measures is not considered a
reasonable solution to the flooding problems along the CDO near
Catalina.
As mentioned in section 4.1, in light of the recent emphasis on
nonstructural mitigation practices, constructing levees on the
western side of the watercourse is not recommended.
Alternative (g), acquiring floodprone land in the study area, is
preferred from a safety perspective. The threat to residents of
loss of life and property would be eliminated.
While the cost
associated with total acquisition of the floodway and floodplain
is high, acquisition of only residentially-developed floodway
property by those owners who so request it would lower the cost
significantly, thereby making this a more attractive option.
Moving residents out of the most dangerous areas would reduce the
need to conduct dangerous rescue operations. Finally, residents'
concerns about the disruption imposed by relocating may be assuaged
when compared to the potential impacts of a major flood, should
they remain in the floodway .
Besides the overall safety benefit, additional advantages provided
by acquisition include: preserving the overbank storage areas,
thereby moderating the flood peak discharge and flow velocities;
maintaining the natural sediment transport regime; preserving
increased groundwater infiltration and groundwater recharge by
maintaining a large su-rface area over which infiltration can occur;
preserving the natural open space area while protecting the
existing ecosystem; providing recreational areas for hiking and
horseback riding; and maintaining the overall rural, aesthetic
character of the area.

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4.4 COMPARISON OF FLOODPRONE LAND ACQUISITION NEAR CATALINA WITH
OTHER DISTRICT-WIDE ACQUISITION PRIORITIES

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Recently the Flood Control Planning and Development Division
authored a five-year plan to guide continued implementation of the
priorities established for the Floodprone Land Acquisition Program.
The 1985 Board-adopted priority locations for acquisition included
eight areas: 1) Tanque Verde Wash, from Bonanza Avenue (formerly
Jones Road) to Forty-Niner Country Club Estates, 2) CDO from La
Cholla to Overton, 3) Black Wash, Ajo Way to headwaters, 4) CDO,
from Catalina State Park to Pinal County line, 5) Santa Cruz River
near U.S. Highway 89, 6) Fairview/Limberlost area, 7) High School
Wash, and 8) Rolling Hills Wash.
To date, property has been
acquired along Tanque Verde Creek, the CDO from La Cholla Boulevard
to Overton Road and from Catalina State Park to the Pinal County
line, and along the Black Wash. The recent Five-Year Guidance Plan
recommends that acquisition be continued in these four areas.
Based on the current FEMA Flood Insurance Study and the District's
Black Wash Administrative Floodway Study, average flow depths and
velocities in the four areas recommended for continued acquisition
are hazardous.
The Tanque Verde Creek area is particularly
hazardous, and several conventional homes are located in the
floodway and floodplain. Should a large flood occur, the property
losses would be higher than in any of the other areas identified
for continued acquisition.
Because numerous acquisitions have
occurred along the CDO from La Cholla Boulevard to Overton Road,
acquisition should be undertaken to complete the reach length as
described in the 1983 Canada del Oro River Management Plan.
Several parcels have been acquired in the Black Wash, and continued
emphasis is recommended.
Because only two parcels have been
acquired to date along the CDO near Catalina, acquisition in this
area should not take precedence over the areas where acquisition
has been actively pursued.

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V. RECOMMENDATIONS

Specific recommendations for acquiring property and for reducing
residents' exposure to flooding and flood-related damage along the
CDO near Catalina are:
1) Conduct a restudy of the FEMA floodplain and floodway maps to
better ascertain which properties are at risk;
2) Develop a priority list of parcels to be considered for
acquisition using the existing Board of Supervisors-adopted
guidelines, with modifications as discussed below, and
consistent with new information provided by a FEMA restudy;
3) Acquire parcels which have habitable structures located in the
floodway, on a request basis and subject to available funding.
Because dwellings on two properties are located in the floodway
and will be exposed to extremely hazardous conditions in the
event of a major flood on the CDO, and as the property owners
(Bowers and Coleman) have submitted formal acquisition requests
to the District, staff recommends that these two parcels be
acquired with expediency;
4) Acquire parcels, on a request basis and subject to available
funding, which have habitable structures located in the
floodplain or erosion hazard area that are inconsistent with the
current Floodplain and Erosion Hazard Management Ordinance, and
which are likely to incur flood or erosion damage;
5) Acquire vacant parcels located in the floodway, on a request
basis and subject to available funding, to preserve the
environmental attributes and protect the hydraulic integrity of
this reach of the CDO;

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6) Recommend to property owners that flood insurance be obtained
for all insurable structures in the floodplain;
7) Direct staff to investigate a) which residential structures in
the floodway and floodplain were "grandfathered in", i.e. those
present prior to the adoption of local floodplain management
regulations in 1974, and those present prior to the release of
the preliminary FEMA Floodway and Floodplain maps in 1979, and
b) which structures were installed or constructed illegally.
For those structures which constitute violations, enforcement
action is recommended;
33

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8)

Institute a program to monitor construction and installation
activity in floodprone areas. It is recommended that quarterly
field investigations and an annual overflight be conducted to
ensure compliance with current regulations. Enforcement action
should be pursued for observed violations; and

9) Strict enforcement in applying the regulations contained in the
Floodplain Management and Erosion Hazard Ordinance is
recommended to the Flood Control District Board of Directors.
Basis for Recommendations
Current floodplain management regulations as prescribed in the
Floodplain and Erosion Hazard Management Ordinance prohibit
constructing buildings in the floodway, and place restrictions on
constructing in the floodplain.
Approving waivers and variances
in this area may result in a life-threatening situation, and will
probably increase the cost to acquire the property in the future,
as the property will likely include improvements associated with
the waiver or variance.
Consistency in applying the regulations
should not be compromised, and strict enforcement is advised.
Should any variance be granted, one condition of the variance
should be a covenant running with the land, stating that the
District will not pursue acquisition of the improved property.
The obvious channel changes and therefore, changes in the location
of the floodway, have occurred due to grading, diversion, and the
installation of the Golder Ranch Road bridge. Most development in
the floodway is prohibited by the Floodplain and Erosion Hazard
Management Ordinance.
The floodplain and floodway boundaries
should be revised based on a restudy of the FEMA floodway maps so
as to better ascertain which properties are at risk.
Based on the results of this investigation and previous studies,
it is recommended that parcels which have habitable structures
located in the federally-mapped floodway be acquired, as requested
by property owners and as funding is available.
Priority of
acquisition should be based on proximity to the main CDO channel
and the likelihood of severe damage being incurred.
After a
property has been acquired, all structures should be dismantled and
removed from the hazardous areas.
Properties which have
residential structures located in the floodplain and erosion hazard
areas that are inconsistent with current Floodplain Management
Ordinance regulations and which are likely to incur damage should
be acquired next, followed by acquiring vacant property located in
the floodway.
34

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It should be noted that the acquisition priorities as recommended
above differ somewhat from the 1985 Board-adopted priorities, in
that the latter assigned a higher priority to acquiring unimproved
(vacant) parcels in the floodway rather than to acquiring improved,
occupied residential property located outside the floodway but in
the floodplain.
According to documentation provided in Appendix
A, the Board-adopted guidelines can be altered when acquisition
fulfills community goals, i.e. in this case relocating residents
from dangerous areas.
Based on this study of the Lago del Oro
reach along the CDO near Catalina, it is felt that the slight
modification of acquisition priority is consistent with the
philosophy and intent of the 1985 Board-adopted priorities.
It must be emphasized·that the floodprone land acquisition program
is voluntary, and that residents will not be forcibly removed from
their homes. Individuals requesting acquisition are encouraged to
submit appraisals and a historical documentation of flood damage
incurred.
Satisfactory agreement on all costs involved must be
reached between the District and property owners.
Decisions to
acquire property are subject to the availability of funds, and must
be weighed against other District-wide acquisition requests.
The
District is generally not interested in acquiring manufactured
homes because of their limited utility for public purposes.
Finally, as listed in more detail in Appendix A, acquiring vacant
property in the floodway would provide multiple community benefits
including: attenuating the peak discharge by providing overbank
storage and conveyance capacity, promoting groundwater recharge
through infiltration through the natural channel bottom, providing
an open space area for recreational and aesthetic purposes, and
reducing the need for structural flood control projects in this
area.

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VI . REFERENCES

[l]

Federal Emergency Management Agency, Flood Insurance Rate Map,
Pima County, Arizona. Panel numbers 445 B, 465 B, and 1035 B.
Flood Boundary and Floodway Maps, panel numbers 3 and 4.
February, 1983.

[ 2]

University of Arizona, School of Renewable Natural Resources,
Critical and Sensitive Wildlife Habitats of Eastern Pima
County. 1986.

..

[3]

Dames & Moore, Eastern Pima County Trail System Master Plan,
prepared for Pima County Parks and Recreation Department .
August, 1989.

...

[ 4]

Anderson-Nichols & Co., Inc., Phase I (Channelization /Levees)
Reconnaissance Level Study of the Canada del Oro Wash Flood
Control Project, Catalina, Arizona. Prepared for the Arizona
Department of Water Resources. March, 1982.

[5]

Federal Emergency Management Agency , Flood Insurance Study
for Eastern Pima County. February, 1983.

[6]

Pima County Flood Control District Comprehensive Program, Pima
County Department of Transportation & Flood Control District,
Planning & Development Division. December, 1990.

[ 7]

Pima County Board of Supervisors, Floodplain
Ordinance No. 1974-86. December, 1974.

[8]

Huckelberry, C.H., Pima County Department of Transportation
and Flood Control District, written memorandum.
1980.

[9]

Pima County Board of Supervisors, Pima County Floodplain and
Erosion Hazard Management Ordinance No. 1988-FC2. December,
1988.

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Management

[ 10] Anderson-Nichols & Co., Inc., Phase II Reconnaissance Level
Study of the Canada del Oro Wash Flood Control Project.
Prepared for the Arizona Department of Water Resources.
March, 1982.
[11] Pima County Department of Transportation and Flood Control
District, unpublished staff reports.

36

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APPENDIX A
1985 BOARD-ADOPTED PROGRAM CONCEPT:
FLOODPRONE LAND ACQUISITION

,...

Board of Supervisors Memorandum
,.

Subject:

Floodprone Land Acquisition Program

page 1 of 2

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RECOMMENDATION:

..

It is recommended that the Board of Supervisors approve bond funding in the approximate
amount of $40 million in general obligation bonds of either Pima County or the Flood
Control District. This funding will allow more land beset by critical flood hazards to
be acquired in the immediate future, at the lowest overall cost.

,.

REPORT:
Flood control has been traditionally accomplished through the construction of structural
improvements such as channels, levees, and similar facilities for the purpose of protecting
real and personal property from flood and erosion damage. In the last ten years, enactment of floodplain management regulations emphasizing nonstructural flood control
measures has been used to prevent future flood losses. More recently, the acquisition
of floodprone lands has been increasingly recognized and successfully used as a method
of preventing future flood damages.

...
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Flood damage reduction through floodprone land ac·quisition is a viable and effective
flood control tool which assists government in its role of assuring public safety, while
contributing to other community goals such as recreation and open space.

r

The Flood Control District has specific statutory authority to acquire property under
the Arizona Revised Statue 45-2343. "Powers, duties and immunities of district and
board: 11 •
Previous programs have been.initiated immediately after natural flood disasters in almost
all cases. The October, 1983, flood caused significant damage to real and personal
property within Pima County. In response, $8.3 million of the budgeted $63.8 million
Flood Repair and Flood Hazard Mitigation Bond Issue was earmarked for damaged properties.

r

The acquisition of floodprone lands provide multiple community benefits which would
include natural moderation of floods by reducing flood velocJ.ties, increased groundwater
infiltration within natural channels, protection of flora and fauna within natural floodplain
habitats, preservation of open space in the urban environment, recreational areas for
picnicking and other activities, and reduction of flood losses, emergency relief needed,
and structural flood control works •

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There are direct economic benefits for the acquisition of floodprone lands when considering the removal of flood hazards through either acquisition or the construction of flood
control facilities. It is also clear that in some cases, construction of flood control facilities is appropriate and the most economical response for flood hazard mitigation.
Priorities have been set for acquisition of floodprone lands that fulfill community goals
of- flood storage, groundwater recharge, recreation, open space, or completion of parcel
acquisition within a designated area. When considering these, emphasis should be given
to flood storage and groundwater recharse.

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Subject: Floodprone Land Acquisition Program

Page 2 of 2

Based on the previous. I recommend bond funding to allow more land beset by critical
flood hazards to be acquired in the immediate future, at the lowest overall cost.
Respectfully submitted,

c.

C. H. Huckelberry, RLS, P
Director
Department of Transportation and Flood Control District
12/5/85

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FLOOO DAMAGE REOUC TIUN Tlli{OlJGH FLOOOPRONE LANO ACQUISiliON

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Traditionally, flood control has been accomplished through tile construction of structural
improvements such as Channels, levees, dams, and similar facilities for the purpose

of protecting real and personal property from flood and erosion damage. ·In the last
ten years land use regulation by enactment of floodplain rnanagement regulations emphasizing nonstructural flood control measures has been used to prevent future flood loss

by controlling occupation in or adjacent to flood hazard areas. More recently, the
acquisition of floodprone lands has been increasingly recognized and successfully used
as a method of preventing future flood damages .
Today flood control in its broader application includes (1) the physical construction
of flood control facilities to protect real and personal property from flooo and erosion
hazards; (2) the imposition of land use regulations through floodplain management to
prevent unwise occupation of flood hazard areas; and (3j acquisition of real and personal
property to remove improvements from flood hazard areas by demolition, returning
the flood-hazard areas to their natural condition prior to encroachment by man .
Flood damage reouction through floodprone land acquisition is a viable and effective
flood control tool which assists government in its role of assuring public safety, while
contributing to other community goals such as recreation and open space .

...

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PRUGRA_Ivl BENEFITS
The acquisition of floodprone lands provides multiple community benefits. These benefits
are:

,..

natural moderation of ·floods by reducing flood velocities, flood peaks, and
flood depths

..

water quality maintenance by natural infiltration and filtration of storm
water runoff and reduction of downstream siltation and debris
increased groundwater infiltration within natural channels, enhancing groundwater recharge which is necessary to support human use and prevent land
subsidence due to groundwater overdraft
protection of flora and fauna by maintaining and preserving natural floodplain
habitats
.,.

...

providing and preserving natural open space

..

providing natural areas in an urban environment

providing recreational areas for hiking, picnicking, bicycling, and equestrian
activities

...

direct

and

indirect economic benefits from reduced flood losses; reduced

public costs of disaster assistance and emergency relief; reduced public

)
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costs

of emergency operations during

flood disaster;

avoidance of costs

ot str·uctur·ai flood contcol works; decrc.asing the cost
for water quality maintenance; reducing the cost of

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of

w~1tcr

water

treatment

supply

(from

groundwater recharge).

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PROGRAM AUTHORITY
The (County) Flood Control District has specific statutory authority to acquire property
under the Arizona Revised Statutes.

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§

45-2343.

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11

Powers~

duties and immunities of district and board:

A district organized under this article, acting through its board of directors, may:
1.

Acquire by eminent domain or othen·lise rights-of-way for and construct,
operate and maintain flood control works and storm drainage facilities within
or without the district for benefit of the district •

2.

Acquire by eminent domain or otherwise and own and dispose of real and
personal property within the boundaries of the district. Section 9-403 does
not apply to a flood control district organized under this article."

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PREVIOUS PROGRAMS

...

Acquisition programs have been initiated immediately after natural flood disasters
in almost all cases. The initiation such acquisition programs reflects floodplain regulations that prohibit rebuilding and reoccupation. of floodprone areaJC after a specified
percent (SO) of flood damage has occurred. The October, 1983 flood caused significant
damage to private, real, and personal property within Pima County. In response to
this significant damage, $8.3 million of the (year) $63.8 million Flood Repair and Flood
Hazard Mitigation Bond Issue was specifically earmarked for acquisition of flood damaged
properties.

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Appendix 1 lists all properties which have been acquired pursuant to the acquisiton
and relocation program contained in the flood repair and flood hazard mitigation bond
issue. In addition, the floodplain management ordinance prohibits specific improvements
in certain floodprone areas as required by Federal and State regulations. Acquiring
these hazardous floodprone areas assures that the goals of floodplain management and
the community are best achieved, by insuring they remain natural and will not require
costly structural flood control improvements due to development pressures.

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CONTINUING PROGRAM
The Flood Control District was established in 1978 by ma9date of the State legislature.
The tax rate since 1980 has varied between $0.47 and $0.52 per $100 of assessed valuation
which has increased between $5.5 million and $10.1 million annually. During the early
years of the District, funding was utilized primarily for operating expenses and construction of flood control works.

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For the first time in Fiscal Year 1985-86, a substantial portion of Flood Control District
revenues are dedicated to acquisition of· floodprone lands. $1.8 million of District funds
will be used to continue acquiring properties which have been severely flood damaged
or are subject to such damage due to their proximity to a flood hazard, such as residential
property located within a defined floodway on a major river system.

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Ua'...ed on our desire to continue the .Jcquisition proyram, long term plans call for l)tJd~·~ting
$1 to $3 million each fiscal year fof· the foreseeable future. However. this level of

annual funding will not satisfy either the short term goal of acquiring existing areas
in immediate threat of flooding or the long term goal of acquiring larger parcels for
upstream detention/retention facilities for flood storage and demonstration groundwater
recharge· projects.

ECONOMIC COMPARISut< OF FLOOD HAZARD REDUCTIOt< THROUGH ACQUISITION
VERSUS FLOOD CONTROL WORKS CONSTRUCTION
While acquisition benefits of floodprone lands, such as open space, habitat preservation
and groundwater redlarge cannot be economically quantified, a direct economic compari-

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son can be made between acquisition which eliminates flood damage potential and the
construction of flood control works which provide flood hazard mitigation. Three
comparisons will be cited: two of which demonstrate the obvious economic benefits
of acquisition and relocation; and the remaining example which demonstrates that certain
flood hazards can best be eliminated through structural measures.
The first example is in an area known as Cardinal-Los Reales. In this location, a mobile
home subdivision occupied the floodway of the west branch of the Santa Cruz River.
Flooding in the particular area was severe and recurrent over the last ten years. In
a joint study .Pima County and the Arizona Department of Water Resources examined
flood control alternatives for the area. The construction of a flood control facility
to eliminate recurring flood damage in the area was estimated to cost $3.5 million,
while the acquisition. and removal of improvements to the property was estimated to
cost $2.0 million. Funding for acquisition/relocation was allocated to this area from
the 1984 Flood Repair and Flood Hazard Mitigation Bond issue and $0.46 million was
spent for complete acquisition of improved property and relocation of inhabitants.
In the second example, residents in the Catalina area were occupying a floodplain of
the upper Canada del Oro Wash under the mistaken belief that the Golder Dam provided
flood protection. A study sponsored by Pima County and the Arizona Department of
Water Resourses initiated after the breaching of Golder Dam examined various alternatives for eliminating flood hazards to Catalina area residents located in the Canada
del Oro Wash floodplain. The construction of a flood control facility to protect residents
from flood hazards of the Canada del Oro Wash and its tributaries was estimated to
cost $12.4 million. The estimated cost of acquisition/relocation was $4.5 million. Due
to the fact that major flood damage has not occurred within the upper basin of the
Canada del Oro Wash, acquisition and relocation of flood susceptible properties has
not been actively pursued.
basis .

However, several acquisitions have occurred on a voluntary

To demonstrate the fact that there are appropriate circumstances for structural measures
to eliminate flood hazards, the last example indicates the economic benefit of constructing flood control facilities versus acquiring and relocating flood suseptible properties.
The area which now comprises the Town of Oro Valley was developed in the early 1960's,
almost entirely within the floodplain of the Canada del Oro Wash. A significant portion
of tne residential center of the town was constructed within the floodway of the Canada
del Oro 'vVash.

Pima County and the Arizona Department of Water Resources constructed

a joint flood control levee system to protect the town from the flood hazards of the
Canada del Oro Wash. This project cost approximately $6.5 million. To acquire and
relocate the property which has been protected by the construction of the Oro Valley/
Canada del Oro Project, would have cost $20 to $25 million .

...
!"

J -

.f/.~

-

..

lilrough these ex<-unplcs it is cledr ther-e .Jc-c du-ect •~UJflOilliC benefits fo,- the .;:Jc<~ui-:. 1 tion
of floodpronc :auds when considering the r-emoval ot flood hazards through either acquisi-

-

tion or the construction of flood control LJcilitics~ It is also clear that in some cases,
construction of flood control facilities is appropriate and the most economical response
for flood hazard mitigation .

.
..

1984 BOND ISSUE PRIORITIES
The following priorities were used in developing the acquisition and relocat-ion program

for the 1984 Flood Repair and Flood Hazard Mitigation Bond Issue. These priorities
were structured to reflect actual October, 1983, flood damage to property. They are:

...

A.

Improved property where there has been a total loss of personal and real property
and where there is no salvage value or the possibility to reclaim lost property.

..

B.

Improved property receiving more than SO percent damage from a flood and no
approved or programmed flood control project will remove the threat of future
flood or erosion damage.

...

c.

Improved property with less than SO percent damage from a flood and no approved
or programmed flood control project which will remove the threat of future flood
or erosion damage ..

D.

Improved property which is subject to constant flood hazard with damage occurring
at least three out of five years.

E.

Previously undamaged unimproved property which is subject to severe flood or
erosion hazards and is located in a defined floodway.

F.

Improved and unimproved property which is floodprone for which there exists
an approved open space and recreation plan which is consistent with sound principles
of floodplain management.

..
I"'

..

FUTURE PRIORITIES
Based on the fact that most flood damaged properties have been acquired through the
1984 Flood Repair and Flood Hazard Mitigation Bond issue, the following priorities
are recommended for continuing floodprone land acquisition program.
Priority 1:

...

Improved real property occupied for residential use where flood damage has been expenenced in three out of the last five years.

r

Priority 2:
Improved real property occupied for residential use located in a designated floodway .

...

Priority 3:

'

..

.

Unimproved real property which is located in a designated floodway.
Priority 4:

)

Improved real property occupied for residential use which lies outside a designateC
flood way, but within a regulatory 100 year floodplain .

!"'

Unimproved real pt·opcrty which lies outside designated floodway~ but within a regulatory

100 year floodplain.

....

-

These priorities can be altered when acquisition of floodprone land fulfills other community goals· of flood storage~ groundwater recharge. recreation, open space .. or completion
of parce I acquisition within a designated area. \"~hen considering these, ernphasis shou I d
be given to flood storage a~d groundwater recharge.

PRIORITY LOCATIONS FOR ACQUISITION
Based on the criteria specified in the previous sections, the following general priorities
for funding of future acquisitions are specified by watercourse.

Location
1.

L

2.

l

3.

~

4.

I )

~

l
'

~
i

l
l
'\

l

5.

6.

7.

8.

9.

10.
11.

Priority

Tanque Verde Wash
A. Craycroft Road to the Wilmot Road alignment
B. Jones Road to the Forty-Niner Country Club
C. Forty--Niner Country Club to Coronado National Forest boundary
Canada del Oro
A. La Cholla Boulevard to Overton Road
B.
Catalina State Park north to County Line
Sabino Creek
A. Tanque Verde Wash to Coronado National Forest boundary
Rillito River
A. Southern Pacific Railroad to La Cholla-Boulevard
B. Country Club alignment to Craycraft Road including
Bend area
Alamo Wash confluence
Columbus Boulevard area
Pantano Wash
A~
Craycroft Road to Glenn Street alignment
B. Golf Links to Houghton Road
C. Houghton Road to Los Reales Road
Agua Caliente Wash
A. Jones Road to Houghton Road
B. Fort Lowell Road to Coronado National Forest
Rinc0<1 Creek
A. Confluence with Pantano Wash to Camino Lorna Alta
including Rancho Pequinous area
Santa Cruz River
A. Sanders Road to Avra Valley Road
B. 29th Street to Ajo Way
C. U.S. Highway 89 vicinity
D. Canoa - Amado area
Pima Wash
A. Oracle Road to Coronado National Forest boundary
Black Wash
A. Ajo Way to headwaters
Miscellaneous areas
A. Tributary foothills washes
B. Fairview/Limberlost area
~C.
High School Wash
0. Rolling Hills Wash

3
1

2

2
2

3
4
4

3
3
5
3
3

3
4

4

3,5
2,3

2

- 5-

7/u

I""

I

-...

LA! J 1 '- _\,_t) ,) _! _:,
Th(~

A.

(L

-

cost of acquiring improvements constructed upon the land.

Generally~

the

The cost of the real property, the value of which is established by .comparable
sales or an estimate of value considering the flood hazard encumbrance.

Based on historical value trends in Pima County and Tucson, floodprone land acqutsttion should be carried out as soon as possible in order to minimize future costs .. \'Vhile
the cost component for improvement replacement is relatively predictable, rising only
with the consumer price index.. the value of real property has been escalating at a much
more rapid rate within the last twenty years. Based on the rapid urban growth rate
and expansion of metropolitan Pima' County which has occurred, it is unlikely that real
property value acceleration will decline in the foreseeable future. Depending upon
the size of acquisition, location, and immediate surrounding property values . . the value
of real property in a flood way has varied from a low of $1,000 per acre to a high of
$20,000 per acre with the average value today being in the range of $7,500 to $12,500
per acre.

...

..
..
..

As an example of increased land cost with time, Pima County purchased right-<:>f-way
for Ina Road west of Interstate 10 in 1973 at a cost of $500 per acre. Several years
later the price increased to $1,000 per acre when parcels began to be assembled for
the Ina Road Wastewater Treatment Plant. The last large parcel for the site was acquired
in 1981 at the appraised value of $10,000 per acre. Another example of the rapid increase
of land values is the Kolb Corridor through Davis Nlonthan Air Force Base. Most of
the right-of-way for this project was purchased for $10,000 per acre; three years later
land along the route is now selling for $60,000 per acre .

-

..

-

Due to external influences that affect real estate markets, tnere can be no accurate
long term forecast of land values in Pima County. Appraisers and real estate analysts
will not forecast longer than 12 to 24 months in advance. lv\ost analysts are predicting
a 10 to 15 percent increase in value (appreciation rate) for commercial properties between
1985 and 1986. General appreciation rules for land banking require land values to double
in three years to justify the holding costs of taxes and interest. For speculative property,
investors look for a doubling of actual investment within two years. However, this
rate of appreciation is only applicable to high risk investments •

-..

To provide a quick, historical reference illustrating land appreciation, two general locations have been examined where land value increases over ..,.time have been documented.
This data is summarized in Appendix 2. In examining Appendix 2, it is obvious that
land values have increased dramatically over the last few years, and are anticipated
to further increase in the future ana will influence the value of floodprone properties.
It would be prudent to maximize purchase of floodprone land as quickly as funding permits
possible .

-

..

-

..

n~.~

cost of acquisition has been set at improvement replacement value rather than
either rnarket val~e or depreciated value; and

I""

..

cost of acquiring flood prone lands is related to:

SUMMARY
Pima County's floodprone area acquisition program should be continued and significantly
increased in scale. In order to sufficiently expand the program, bond funding in the
approximate amount of $40 minion should be made available general obligation bonds

\

.I

- 6 ..

of either Pima County or the Flood Control District.

This rnagnitudc of funding will

allow more land beset by critical flood hazards to be acquired in the immediate future,
at the lowest overall cost.

CHH:ac
10/31/85

-]-

4 (q

...
...

...

..

...
...
...
...

..
..

...

..

-

APPENDIX B
LISTING OF PARCELS AND DWELLINGS
IN
FLOODPRONE AREAS

..
...

..
..
..

.
.
..

..

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

SECTION 1
TAX CODE*
222-01-019
222-01-019K
222-01-0 19L
222-01-021
222-01-025
222-01-026
222-01-027

.

222-01-028

..

222-01-030

222-01-029A

#OF
DWELLINGS

v
v
v
v
v
v
v
v
v
v

LAND LOCATION
FW, FP

DWELLING
LOCATION

-

FP

-

FP

-

FW, FP, EH

-

FW, FP, EH

-

FW, FP, EH

-

FP

-

FW, FP
FW, FP, EH
EH

-

-

-

..

-

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW = IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 = OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS

II
//).

...

..

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

-

SECTION 2
#OF
DWELLINGS

LAND LOCATION

DWELLING
LOCATION

222-02-0 19A

IC

FP

0

222-02-062A

v
v
v
v
v
v
v
v
v
v
v
v

FW, FP, EH

-

TAX CODE*

...

..

.

222-02-078
222-02-079
222-02-080
222-02-081
222-02-082
222-02-083
222-02-083

...

222-02-084
222-02-085

...

...

222-02-086
222-02-088

FW, FP

-

FW,FP

-

FW, FP

-

FP

-

FP

-

FP

-

FP

-

FW, FP, EH

-

FW,FP

-

FW, FP, EH

-

FW, FP, EH

-

..
'

..
.

V =VACANT
C = CONVENTIONAL DWELLING
MH =MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
• =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

...

...

,..
,..

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

,..
,..

SECTION 10
TAX CODE*

#OF
DWELLINGS

LAND WCATION

DWELLING
WCATION

,..

222-28-079

,..

222-28-081A

v
v
v
v
v

222-28-082

1C

FW,FP

FW

1MH

FW, FP

FW

222-31-018

1C

FW,FP

FP

222-31-019

FW,FP

-

222-31-020

v
v

FW,FP

-

222-31-021

1MH

FW,FP

FP

222-31-022

4MH

FW, FP

FP

222-31-023

2MH

FW, FP

FP

222-31-024

v

FW,FP

-

,..

222-28-005
222-28-078

222-28-080

222-28-081B

,..

FW,FP

-

FW,FP

-

FW,FP

-

FW,FP

-

FW,FP

-

r
,..

""
""

V = VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW = IN FLOODWAY
FP = IN FLOODPLAIN, OUTSIDE FLOODWAY
EH = IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 = OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
• = DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

""
3/,,

...

...
...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

...

SECTION 10 continued

...
...

...

TAX CODE*

#OF
DWELLINGS

LAND WCATION

222-31-025

1C

FW,FP

0

222-31-026

1C

FW,FP

0

222-31-027

2MH

FW,FP

FP

222-31-028

1C

FW,FP

FP

222-31-043

v

FW, FP, EH

-

222-31-044

.2C

FW, FP, EH

FW

222-31-047

v

FW, FP

""

""

...

...
...
""

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
• =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

...

DWELLING
WCATION

-

,..

,..
PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

...

SECTION 11
TAX CODE

...
,..

-

222-32-003

FW

-

222-32-004

3MH

FW,FP

FW

222-32-005

FW,FP

-

222-32-006

v
v

FW

-

222-32-007

1C

FW, FP, EH

FW

222-32-008

v
v
v
v
v
v
v
v

FW, FP, EH

-

222-32-011
222-32-012A
222-32-013D
222-32-013E
222-32-013F
222-32-013G

FP, EH
FW, FP, EH
FW, FP.
FP, EH

...

...

r
,..

-

-

FW, FP, EH

-

FW, FP, EH

-

FW, FP, EH

-

...
,..

DWELLING
WCATION

FW, FP

222-32-010

...

LAND WCATION

v
v

222-32-002

...

#OF
DWELLINGS

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

..

...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

...

...

SECTION 15
TAX CODE •

#OF
DWELLINGS

LAND WCATION

DWELLING
WCATION

FW, FP, EH

-

222-35-013

v
v
v
v

222-35-014
222-35-015

222-35-007

FW,FP

-

FW,FP

-

FW,FP

-

1C

FW, FP

FP

FW, FP

-

FW, FP

-

FW, FP

-

222-35-0 17B

v
v
·v
v

FW, FP

-

...

222-35-018

1MH

FW

FW

-

222-35-019A

1MH

FW

FW

222-35-0 19B

v

FW

-

222-35-020

2MH

FW

FW

222-35-021

3MH

FW, FP, EH

FP

222-35-022

v

FW, FP, EH

-

...

..

...'

-

222-35-008
222-35-009

222-35-016
222-35-0 17A

...

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS

...

ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

...
...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

SECTION 15 continued
#OF
DWELLINGS

LAND WCATION

DWELLING
WCATION

222-35-025

lMH

EH

0

222-38-018

1MH

EH

0

222-38-019

...

222-38-020

v
v

222-38-029

2MH

...

222-38-030

2MH

EH

EH

.

222-38-036

2MH

EH

EH

222-38-037

2MH

222-38-038

1MH

222-38-039

v

222-38-040

2MH

222-38-041

v

TAX CODE*

...

...

FW,FP

-

FW
FW, FP, EH

FW, FP, EH
EH
FW, FP, EH
FW
FW, FP, EH

...
...

...

..

.
...
!""
'

...

-

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

EH

EH

FW

-

I"'
;

'"'

'"'

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

SECTION 15 continued
TAX CODE •

'"'
!""

#OF
DWELLINGS

LAND LOCATION

DWELLING
LOCATION

222-38-042

3MH

FW, FP, EH

FW

222-38-043

lMH

EH

0

222-38-045

v

EH

-

222-38-046

lMH

EH

0

222-38-049

EH

-

EH

-

222-38-053

v
v
v

EH

-

222-39-022

lMH

FP

0

222-39-023

3MH

FP

FP

222-39-029

. 3MH

FP

0

222-38-052

!""

!""
I

!""

r'
!""
I

r

222-39-030

lMH "LEASED"

FP

FP

222-39-031

lMH

FP

FP

222-39-032

v

FP

-

222-39-038

2MH

FP

FP

222-39-039

lMH

FP

FP

222-39-040

2MH

FP

FP

222-39-047

2MH

FP

0

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

.
.
...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

SECTION 15 continued
#OF
DWELLINGS

lAND WCATION

DWELLING
WCATION

222-39-048

3MH

FP

0

222-39-052

. 4MH

FW,FP

FP

222-39-053

lMH

FW,FP

FP

222-39-054

lMH

FW, FP

FW

222-39-055

3MH

FW,FP

FW

222-39-056

lMH

FW,FP

FW

222-39-057

lMH

FW, FP

FW

222-39-058

v

FW,FP

-

222-39-059

2MH

FW,FP

FW

222-39-060

lMH

FW, FP

FW

222-39-061

2MH

FW,FP

FW

222-39-062

3MH

FW,FP

2FW, lFP

222-39-063

lMH

FW, FP

FP

222-39-064

2MH

FW,FP

FP

222-39-065

2MH

FW,FP

FP

222-39-066

2MH

FW,FP

FP

222-39-067

lMH "LEASED"

FW,FP

FP

TAX CODE •

..
..

.
..
..
..

.
.
.
.
..
...
...

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
• =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

...
...

...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

SECTION 15 continued
TAX CODE*
222-40-037
222-40-038
222-40-039

...

222-40-040
222-40-041
222-40-042

..

222-40-043

#OF
DWELLINGS

v
v
v
v
v
v
v

LAND WCATION
FW, FP

-

FW,FP

-

FW,FP

-

FW,FP

-

FW,FP

-

FW, FP

-

FW, FP

-

...
...

...

...
,..

...

DWELLING
WCATION

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

.
...

PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

..
...

.
...

..

SECTION 22
TAX CODE •

..

.
.

LAND WCATION

DWELLING
WCATION

222-47-002

v

FW, FP

-

222-47-003

1C

FW, FP

FP

222-47-004

v

FW,FP

-

222-47-005

1C

FW,FP

FW

222-47-006

1C

222-47-007

1C"LEASED"

222-47-008

1C

222-47-009

222-47-014

v
v
v

222-47-019

1C

FW, FP

FW

222-47-020

1C

FW, FP

FW

222-47-021

v

222-47-010

.

#OF
DWELLINGS

FP

FP

FW, FP

FP

FW

FW

FP

-

FP

-

FP

-

FW, FP, EH

V =VACANT
C = CONVENTIONAL DWELLING
MH = MANUFACTURED HOME
FW =IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

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PARCELS AND DWELLINGS LOCATED IN FLOODPRONE AREAS
CANADA DEL ORO WASH, T11S R14E
CATALINA STATE PARK TO PINAL COUNTY LINE

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SECTION 22 continued
TAX CODE*

222-47-023

1C

222-47-024

222-47-027

v
v
v
v

222-47-028

1C

222-47-029
222-48-002

v
v

FW, FP

-

222-48-003

1C

FW, FP

FW

222-48-004

v
v
v
v

222-48-005
222-48-006
222-48-007

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DWELLING
LOCATION

v

222-47-026

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LAND
LOCATION

222-47-022

222-47-025

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#OF
DWELLINGS

FW, FP
FW, FP, EH

FW

FW, FP, EH

-

FW, FP, EH

-

FW, FP, EH

-

FW

FW, FP
FP

FW, FP, EH
FW, FP

FP
-

-

FP

-

FP

-

V =VACANT
C = CONVENTIONAL DWELLiNG
MH = MANUFACTURED HOME
FW = IN FLOODWAY
FP =IN FLOODPLAIN, OUTSIDE FLOODWAY
EH =IN EROSION HAZARD AREA, OUTSIDE FLOODPLAIN AND FLOODWAY
0 =OUTSIDE FLOODPLAIN, FLOODWAY, EROSION HAZARD AREA
' =DATA FROM PRELIMINARY 1991 TAX ROLLS
ASSUME DWELLING OWNER-OCCUPIED UNLESS MARKED "LEASED"

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APPENDIX C
DRAINAGE ASSESSMENTS

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FOR THE
BOWERMAN, COLEMAN, AND BOWERS PROPERTIES

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.MEMORANDUM

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Department of Transportation and Flood Control District

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Tom Burke, ~~nager
Property Management

: IBJECT:

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DATE:

August 26, 1991

FROM:

Dave Smutzer, Manager
Flood Control Plng. & Dev.

The Bowerman Property Drainage Assessment

Request Oriain:
The property owner, Mr. Bowerman, applied for
a Floodplain Use Permit, was denied, appealed, and was again
denied.
Under the Flood Control District's floodprone land
acquisition program, the Pima County Board of Supervisors
directed the staff to negotiate acquisition of the site.
An
offer of $13,000 was made for the parcel in mid-1988, but this
offer was rejected by Mr. Bowerman. Recently, Mr. Bowerman has
indicated, through a telephone conversation with an aide to Mr.
Ed Moore, that he wishes to sell the property to the District.
Based upon this request, the parcel is again being evaluated as
part of the overall floodprone land acquisition strategy being
developed for the Canada Del Oro Wash in the Catalina, Arizona
area.
Location and Description: The 1.0-acre parcel, tax code #22238-0390, is located on Wilds Road, Tucson, Arizona (S15-Tl1R14). The parcel is outlined on the attached aerial photograph
and is adjacent to the Canada Del Oro (CDO) Wash.
No specific
street add=ess is available for the property.
No major
improvements have been made to the property .
Mr. Bowerman purchased two one-acre parcels; one unimproved
parcel adjacent to the east bank of the CDO Wash (the subject
parcel),
and
a
second
parcel
adjacent
to
the
first.
Improvements were made to the second, eastern-most parcel. The
subject parcel remains unimproved due to continual denial of the
required Floodplain Use Permit. Recently, Mr. Bowerman sold the
improved parcel to Mr. Carlson.
Current Flood Status:
The attached Flood Insurance Rate Map
(FIRM) panel shows the western one-third of the property lies
within the CDO 100-year floodplain.
Additionally, the entire
property lies within the 250-foot erosion hazard zone applicable
to this portion of the Canada Del Oro Wash.

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August 26, 1991
The Bowerman Property Drainage Assessment
page 2

The parcel does not appear to lie within the currently defined
CDO floodway.
The District is requesting a restudy of the CDO
floodway which may result in a redefinition of the regulatory
limits of the CDO Floodway in the vicinity of the parcel.
Historical Flood Stat us:
In September 198 4, Mr. Bowerman
acquired the property.
On 11/4/84, Mr. Bowerman filed an
application for a floodplain use permit.
In a letter dated
1/21/85, the permit was denied because the parcel was within the
erosion hazard area of the CDO Wash. Mr. Bowerman appealed in
a letter dated 2/29/88, and the appeal was again denied in a
letter dated 3/25/88.

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Justification of the denials was explained in a letter dated
11/24/87, in which it was stated that the mobile home Mr.
Bowerman proposed for the property "would be approximately
twenty feet from the 100 year flood limit and one hundred and
twenty feet from the low flow channel. The soils do not appear
to be able to withstand the erosive forces of large floods such
as a 100 year regulatory event."
In mid-1988, the District offered to purchase the property for
$13,000, but was refused by Mr. Bowerman.
Applicable Studies:
The Reconnaissance Level Study of the
Canada Del Oro Wash Flood Control Project (Arizona Department
of Water Resources, January 1982) developed a flood control plan
for the Upper CDO watershed. The study recommended purchase of
flood prone properties and installation of a flood warning
system as nonstructural measures to reduce flood damage in the
vicinity of Mr. Bowerman's property. The study also recommended
bank protection or levees as structural methods of protecting
floodprone residential areas.
The Critical and Sensitive
Wildlife Habitats of Eastern Pima County study, conducted by the
University of Arizona School of Renewable resources, designated
the CDO area around "the property as a major extension of
riparian habitat, suitable for animal movement, hiking, and
horseback riding .

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August 26, 1991
The Bowerman Property Drainage Assessment
page 3

Staff Recommendation: Based upon the understanding the property
owner rejected the District's acquisition offer made in 1988,
the staff recommends .against acquiring the property at this
time.
The parcel has a low property acquisition priority
ranking for the CDO Wash, as well as County-wide, because it is
undeveloped and not currently located within the defined CDO
Wash floodway.

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Thomas Helfrich
Rose Doolen

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MATCH TO PANEL 3b

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MEMORANDUM

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DEPARTMENT OF TRANSPORTATION AND FLOOD CONTROL DISTRICT
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DATE:

Octob~,?90">.._·

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TO:

Coleman Property Along Canada De

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The Honorable Greg Lunn, Member
Board of Supervisors

,. SUBJECT:

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Wash

As you will recall, Mr. William Coleman submitted an August 21, 1990, letter
requesting that his home and property be considered for acquisition by Pima
County because of flooding and erosion danger.
The Flood Control District
staff has conducted a drainage assessment for Mr. Coleman's property; and an
October 5, 1990, draft copy of this assessment is included for your
information.
Please note that this assessment identifies the existence of a floodplain use
permit granted in 1981 that required Mr. Coleman to hold Pima County harmless
from flooding and erosion damage upon the property. The enclosed maps show
that 90 percent of the property lies within the CDO 100-year floodway.
Therefore, acquisition of Mr. Coleman's property is an appropriate action and
one that was recommended by the 1982 Reconnaissance Level Study completed by
the Arizona Depart1llent of Water Resources.
The Flood Control District is
prepared to move forward with this acquisition; however, we prefer to advance
acquisitions along the Canada Del Oro Wash under a comprehensive flood control
strategy approach for this major watercourse.
We are initiating a flood control study for the Canada Del Oro Wash that will
be completed within the next six to nine months. However, the initial work
involved in this study is to gather all necessary data to determine the
specific flooding conditions in existence and to quantify the number of
parcels, residential dwellings, and undeveloped lots within the floodplain and
floodway and to determine the total current market value of these properties.
This initial data gathering will be completed within four to six weeks •
After completion of the data gathering effort, particularly as it relates to
floodprone properties, the District will be prepared to recommend to the Board
of Supervisors a preliminary acquisition program with recognition of the
ultimate acquisition costs for the entire CDO Wash area. At that time, we
would be prepared to move forward with the Coleman acquisition unless a Board
decision directed us to do otherwise.
If you have any questions regarding this matter, please contact me.

JMB:cm
Enclosures
c:

C. H. Huckelberry, Assistant County Manager
Dave Smutzer, Manager, Flood Control Planning and Development

MEMORANDUM

Department of Transportation and Flood Control District

,..
I""To:

DATE:

Tom Burke
Property Management

'"'SUBJECT:

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FROM:

October 5, 1990

Thomas Helfrich
Planning Division

Coleman Property Drainage Assessment.

Request Origin: In an August 21, 1990 letter (attached) to Supervisor Greg Lunn, William
Coleman requested that his home and property be considered for acquisition by Pima County
because flooding and erosion danger. Mr. Coleman stated that his property was severely
damaged in the flood of 1983, and that recent upstream development has increased flooding
hazards to his property. Mr. Coleman added that he was unable to leave his property four
times during the 1990 monsoon season.
Location and Description: The 2.5 acre property, tax code #222-32-0070, is located at 15700
North Lago Del Oro Parkway, Tucson, Arizona (S 10-11, Tl1S, R14E), on the Canada Del
Oro Wash (CDO). The hand drawn map included in Mr. Coleman's letter appears to be
incorrect. The location and size of the property and access easement, as determined by staff
from its legal description, are shown on the attached aerial photograph. The property contains
a single family residence and a swimming pool.
Current flood Status: The attached Flood Insurance Rate Map (FIRM), shows the property and
access easement lie completely within Zone A4 of the CDO 100-year floodplain. The Zone
A4 designates an area of known 100-year flood elevations. The attached Flood Boundary and
Floodway Map shows 90% of the property and 75% of the access easement lying within the
CDO 100-year floodway. The property, dwelling, swimming pool, and access easement lie
completely within the CDO 500 foot erosion hazard setback. The dwelling and pool are
located approximately 25 feet from the dominant :ow flow CDO channel.
Historical Flood Status: Floodplain Management ftles show a Floodplain Use Permit was
granted in May 1981 for building a pool and enclosed wall adjacent to the residence.
Floodplain Management determined then that the proposed improvement would have negligible
influence upon the existing floodplain. Because of potential flooding hazards to the property,
the Colemans were required to record a Declaration of Restrictions and Covenants, holding
Pima County harmless from flooding and erosion damage upon the property. The declaration
also limited property use to that allowed in the Floodplain Use Permit and Floodplain
Ordinance. The recorded declaration is included in the Coleman Floodplain Use Permit file.
No copy of the Floodplain Use Permit exists in the file and the issuance status of the permit
is unknown.
A drainage complaint (#82-192) was filed by Mr. Coleman with Floodplain Management in
September 1982. Mr. Coleman stated that upstream sand and gravel mining of the CDO
widened the channel and threatened his property. An investigation by Floodp.lain Management

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staff revealed that unauthorized sand and gravel mining, and channel overbank stripping was
done when a private conrractor prepared to install equipment for resurfacing work on State
Highway 89. Floodplain Management staff determined the excavations posed a threat to
downsrream properties, prevented further excavation, and made recommendations for rerurning
the channel and overbank to narural condition .
Aoplicable Srudies: The Reconnaissance Level Study of the Canada Del Oro Wash Flood
Conrrol Project (Arizona Deparunent of Water Resources, January 1982) developed a flood
conrrol plan for the Upper CDO watershed. The study recommended purchase of flood prone
properties and installation of a flood warning system as nonsrructural measures to reduce flood
damage in the Coleman property vicinity. The study also recommended bank protection or
levees as srrucrural methods of protecting flood prone residential areas. The Critical and
Sensitive Wildlife Habitats of Eastern Pima County study, conducted by the UA School of
Renewable resources, designated the CDO area around the property as a major extension of
riparian habitat, suitable for animal movement, hiking, and horseback riding .
SupplementarY Wormation: The nearest Pima County property acquisition to date is limited
to an easement for the Golder Ranch Drive Bridge, located approximately 2 miles downsrream
from the Coleman property.
Staff Recommendation:

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MEMORANDUM
Department of Transportation and Flood Control Distrtc

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DATE:

TO:

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Tom Burke
Prnperty Management

SUBJECT:

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FROM:

August 10, 1990
Thomas Helfrich
Planning Division

Bowers Property Drainage Assessment (#222-38-0400).

This assessment was initiated by a July 10, 1990 letter to the District from
Lamar and LuAnn Bowers, indicating their property, located in the Canada Del
Oro (CDO) Wash in Catalina, Arizona, was recently inundated by floodwaters
(on July 7, 1990). The Bowers believed their property is subject to further
flooding and erosion danger and have asked the District to consider acquiring
it (see attached letter).
The Bowers letter incorrectly accused Pima County Flood Control District of
causing their flooding problems by breaching the Golder Dam. The Dam was
in fact breached by the Arizona Water Commission in 1980, after studies
concluded that the dam design and construction was unsafe. The dam was
built ten years before the existence of Pima County's Floodplain Ordinance and
was thus never subject to Pima County Flood Control District regulation.
The five acre Bowers property contains a mobile home, three small sheds and
a garage. The parcel location is shown on the attached Flood Insurance Rate
Map (FIRM) and Flood Boundary and Floodway Map (FBFM). These maps
sl,ow the parcel and its structures lying completely within the boundaries of
b~th the CDO 100-year floodplain and 100-year floodway.
In addition, the
entire parcel is located within the 500 foot erosion hazard setback for the
CDO. The river reach containing the parcel has been classified by the UA
School of Renewable Resources as a Class I Habitat: a major extension of
riparian habitat suitable for horseback riding and hiking.
Comparison between 1979, 1983 and 1988 aerial photographs (attached) shows
that general channel widening has occurred within the reach containing the
property. Historical flow Information for the CDO suggests the current channel
width probably resulted from the October 1983 flood, as seen in the 1983
photograph. In general, the photographs show that abrupt channel widening
and erosion may occur, as shown in the 1983 and 1988 photographs of the
widened channel area just south of the Bowers property.

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Observation of all available aerial photographs from 1979 to the present shows
that the Bowers' mobile home and smaller outbuildings were installed between
1979 and 1983. A garage sized structure was installed between 1983 and
1986. No record exists in the Floodplain Management Section files of issuance

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Tom Burke. August 10. !990. Dowers property. pg.2

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of Floodplain Use Permits for any of the structures. As such. any onsite
improvement placed in a regulated flood and erosion hazard area without a
Floodplain Use Permit conflicts with the Pima County Flood Plain Management
Ordinance.

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A neighbor of the Bowers flied a drainage complaint about their property in
January 1990, accusing the Bowers of dumping construction debris into the
CDO along the west bank, immediately south of Wilds Road. The presence of
construction debris in the channel was verified by a site inspection on March
3, 1990.

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subsequent inspection on July 19, 1990 revealed that most of the
construction debris had apparently washed away. High water marks were
seen on the Bowers property at that time. They indicated recent flooding
caused low velocity flow to reach the channel-side edge of the Bowers' mobile
home .
/I.

Based upon the parcel's proximity to the floodway of the CDO, the evidence
of channel widening shown in the photographs, and the quality of the
associated riparian habitat. the staff recommends that the Bowers property be
acquired if a fair price is negotiable.
xc: Bill Howells
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MEMORANDUM
Department of Transportation and Flood Control District
DATE:

TO:

Thomas J. Helfrich
Chief Hydrologist

SUBJECT :

. FROM :

De c e mber 31, 1991

~~

Joanne Hershenhorn
Principal Hydro1ogiJl

Flood Control Study f or COO, Catalina , Arizona
Actions Needed Based on Recommendations in Report

Based on the nine (9) recomme ndations (attached) listed in the
study, which was adopted by the District ' s Board of Directors
3, 1991 , I recommend the fol l owing actions be
on December
taken:
I. Conduct· a restudy of the FEMA Flo odway and Floodplain Maps
1 . S~eps should be taken to initiate this process. Aerial and
topographic data will need to be generated - an SOW for this has
been written .
An SOW ·should also be written for a consultant
to conduct the restudy , and cost estimates should be prepared.
To determine an appropriate priority for this restudy, the
relative need and cost estimate should be compared with the
next two fiscal years' budget a n d project priority list.
II. Safety Concerns : Ev aluate At-Ris k Properties , and Develop
a Priority List
Because it will be a while be f ore the restudy information will
be ava i lable , we shou l d :
1. Develop a Prio ri ty List f o r At- Ri s k Pro perties
Using the information in Append ix B of the F l ood Control Study
for Canada del Oro Wa sh , Cat a lina, Ari z ona (Study) as a starting
reference , and the most recent aerial photos available (March,
1990), the number and type of structures loca~ed in each of the
three hazard areas (floodwa y , floodplain , a~d erosion hazard
setback) should be determined based on a field investigat i on.
The type of each structure should also be noted .
Using all
available information, a priority list should be developed for
at-risk structures.

PCP0 ·02

·'T~DO

Study, Catalina
Actions Needed
December 31, 1991
Page 2

2. Evaluate Permitting History
Staff should investigate the permitting history for structures
in th~s area.
A listing must be compiled of what regulations
were applicable when, how they were enforced, and which
structures have permits (and which do not, and the most likely
reason why not) . Because the permitting history will be sketchy
until the early 1980's, some decisions will need to made
regarding the cutoff date for when permits should be present in
our files.
III. Notification of Property Owners and Enforcement
1.

P~blic

Notification

I recommend that a public meeting be held in Catalina, to advise
residents of the severity of the situation, notify them that an
enforcement program is being developed, answer questions, and
solicit input.
After the public meeting, and based on the
priority list, property owners should be notified by mail of atrisk structures and the basis for the determination. Those with
unpermitted structures (that were not grandfathered) should be
required to obtain permits, and advised that enforcement will
be pursued. Property owners should be further advised, in the
mailing, that flood insurance should be obtained, as applicable.
2. Enforcement
An enforcement program should be deve:oped and pursued.
IV. Acquisition
1. Develop Priority List for Acquisition
According to the recommendations and priorities established in
the Study, in accordance with the priority list developed in
II.1. above, and verified by
field investigation and a
historical review of the permitting files, property should be
acquired as requested by property owners, and as funding
permits. Structures which were constructed without permits when
the permitting pro"cess
was
well-established are
to
be
prioritized accordingly.
Acquisitions are to conform to CDO

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CDC Study, Catalina
A Actions Needed

December 31, 1991
Page 3

guidelines of Five-Year Guidance Plan.
Because this area is
rated lower than other acquisition areas, little funding will
be available over the next few years, however there is some
flexibility in the overall prioritization.
V. Monitoring
A monitoring program should be instituted as recommended,
including field investigation and overflights.
Enforcement is
to be pursued.
VI. Database Management System
All data should be managed in a database management system, such
as Dbase-IV, for example. The files must be well-documented and
accessible to staff . . Spreadsheets may be helpful too.
This
should be initiated concurrent with II. above. The files shall
be updated as new information becomes available.

**************************************************************
ACTION.CDO

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' V. RECOMMENDATIONS
Specific recommendations for acquiring property and for reducing
residents' exposure to flooding and flood-related damage along the
CDO near Catalina are:
1) Conduct a restudy of the FEMA floodplain and f1oodway maps to
better ascertain which properties are at risk;
2) Develop a priority list of parcels to be considered for
acquisition using the existing Board of Supervisors-adopted
guidelines, with modifications as discussed below, and
consistent with new information provided by a FEMA restudy;
3) Acquire parcels which have habitable structures located in the
floodway, on a request basis and subject to available funding.
Because dwellings on two properties are located in the floodway
and will be exposed to extremely hazardous conditions in the
event of a major flood on the CDO, and as the property owners
(Bowers and Coleman) have submitted formal acquisition requests
to the District, staff recommends that these two parcels be
acquired with expediency;

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4) Ac"quire parcels, on a request basis and subject to available
funding, which have habitable structures located in the
floodplain or erosion hazard area that are inconsistent with the
current Floodplain and Erosion Hazard Management Ordinance, and
which are likely to incur flood or erosion damage;
5) Acquire vacant parcels located in the floodway, on a request
basis and subject to available funding, to preserve the
environmental attributes and protect the hydraulic integrity of
this reach of the CDO;
6) Recommend to property owners that flood insurance be obtained
for all insurable structures in the floodplain;
7) Direct staff to investigate a) which residential structures in
the floodway and floodplain were "grandfathered in", i.e. those
present prior to the adoption of local floodplain management
regulations in 1974, and those present prior to the release of
the preliminary FEMA Floodway and Floodplain maps in 1979, and
b) which structures were installed or constructed illegally.
For those structures which constitute violations, enforcement
action is recommended;
33

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Institute a program to monitor construction and installation
activit:' in floodprone areas. It is recommended that quarterly
field investigations and an annual overflight be conducted to
ensure compliance with current regulations. Enforcement action
should be pursued for observed violations; and
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9) Strict enforcement in applying the regulations contained in the
Floodplain Management and Erosion Hazard Ordinance is
recommended to the Flood Control District Board of Directors.
Basis for Recommendations

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Current floodplain management regulat:.ons as prescribed in the
Floodplain and Erosion Hazard Management Ordinance pror.ibit
constructing buildings in the floodway, and place restrictions on
constructing in the floodplain.
Approving waivers and varia~ces
in this area may result in a life-threatening situation, and will
probably increase the cost to acquire the property in the future,
as the property will likely include improvements associated with
the waiver or variance.
Consistency in applying the regulations
should not be compromised, and strict enforcement is advised.
Should any variance be granted, one condition of the variance
should be a covenant running with the land, stating that the
District will not pursue acquisition of the improved property .
The obvious channel changes and therefore, changes in the location
of the floodway, have occurred due to grading, diversion, and the
installation of the Golder Ranch Road bridge. Most development in
the floodway is prohibited by the Floodplain and Erosion Hazard
Management Ordinance.
The floodplain and floodway boundaries
should be revised based on a restudy of the FEMA floodway maps so
as to better ascertain which properties are at risk.
Based on the results of this investigation and previous studies,
it is recommended that parcels which have habitable structures
located in the federally-mapped floodway be acquired, as requested
by property owners and as funding is available.
Priority of
acqu~sition should be based on proximity to the main CDO cha~nel
and the likelihood of severe damage being incurred.
After a
property has been acquired, all structures should be dismantled and
removed from the hazardous areas.
Properties which have
residential structures located in the floodplain and erosion hazard
areas that are inconsistent with current Floodplain Managenent
Ordinance regulations and which are likely to incur damage should
be acquired next, followed by acquiring vacant property located in
the floodway.
34

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NOTES / AC'l'ION

Tax Credits

1991 - 0001
0020
0039
0046
0073
0084
0091
0094

-

0007
0027
0043
0053
0081
0088
0092
0100

1988 - 88
1989 - 89
1990 - 90
90
1991 - 91
91
91
91

-

8822
8603
8456
8459
8001
8033
8047
8068

- 8457
-

8027
8043
8062
8074

Zl'liOc:)Q COII'l'ROL DISTRICT BOARD
A.

AGREEMENT, CONTRACT, AND/OR AMENDMENT
Urban Engineering, Supplemental Agreement,
Amendment No. 5, Santa Cruz Linear Park, st.
Mary's to Grant, to provide changes to plans
due to lot deletions and additions of soil
cement on East bank, Flood Control Capital
Improvement Fund, contract amount $12,7 3 8.50
increas e (07-04-U-111603-0889) Flood Control

B.

QUIT CLAIM DEED
Transfer of title of property located within
Section 27, of Township 13 South, Range 14
East, from Flood Control District to Pima
County for River Road right-of-way.
(District 1)

C.

FLQOD CONTROL STUDY
Staff requests approval of the canada Del Oro
Wash , Cat al i na, AZ, Flood Control Study
i ncluding staff recommendations .
( District 1)

RA 1 2 -0 3 - 91 (2 )