WSP02116

• File Number: 8281.960
• Description: Colorado River Studies and Investigations -- Lower Colorado Comprehensive Framework Study
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/1/1971
• Title: Lower Colorado Region Comprehensive Framework Study -- Appendix X - Irrigation and Drainage
• Water Supply Pro - Doc Type: Report/Study

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SUMMARY OF FINDINGS

Irrigated land is expected to increase from the 1965 level of
1,315,000 acres to 1,613,000 acres by year 2020. Urbanization is expected
to ramove 204,000 acres from production. The total new irrigation develop-
ment would be 502,000 acres. The program includes the completion of reha-
bilitation of existing distribution systems for 429,000 acres of presently
irrigated lands and new distribution systems to serve 1,075,000 acres, a
portion of which is presently irrigated exclusively by ground water.
Drainage facilities are included to serve 188,000 acres.

The expected increase in irrigated land will necessitate development
of lands not presently irrigated. A portion of this development will be
included in areas that are now developed but idle, while the remainder
will encompass new lands.

Augmentation schames will be required to offset the existing shortages
of water and to provide for future uses.

Development needs and costs based on the Modified OBE-ERS projections
for the hydrologic area of the Lower Colorado Region are as follow:

Drainage
L.M.S,
L.C.
Gila

Rehab. of Exist.
Irrig. .Dist. Sys.
Acreage Served 293
L.M.S. 131
L.C. 2
Gila 160

Units: 1,000
1965 1966-1980 1981-2000 2001-2020
Needs Costs Needs Costs Needs Costs Needs Costs
(ac) "1f) (ac) "1f) (ac) "1f) (ac) "1f)
210 67 13,400 18 3,600 38 7,600
1 200 1 200
2 1 1,000 13 10,840 49 37,700

- 429
- 103
6
- 320

16,700
970
52,000

Develop. of New
Irrig. ~ist. Sys.
Ii.M.S. .
L.C.
Gila

- 346.8
- 127
6.8
- 213

- 596.2
39,400 17.2
2,100 3.0
66,000 576.0

- 132.0
5,300 34.6
800 0.4
178,000 97.0

10,700
200
29,800

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OM&R
---:i:rrigat10n
L.M.S.
L.C.
Gila
Drainage
L.M.S.
L.C.
Gila

2,100 2,200 2,380
220 228 228
7,000 7,480 7,510
277 293 337
7 7
- 20 220 765
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