WSP03614

• File Number: 8270.100
• Description: Colorado River Basin Water Quality/Salinity -- Misc Water Quality
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1981
• Author: USDOI
• Title: Quality of Water - Colorado River Basin - Progress Report No. 10 - January 1981 -- Part 1 of 2 -- Title Page through Part IX - page 98
• Water Supply Pro - Doc Type: Report/Study

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ANTICIPATED EFFECTS OF ADDITIONAL DEVELOPMENTS (continued)

Year
1974
1975
1976
1977
1978
-1/

Diversion.!./
Acre-feet 106m3
o ----0-
3,300 4
20,BOl 26
30,049 37
32,794 40
No surface return floWS.

No lands were developed from 1978 to 1979. An arbitarary uniform land
development rate of 980 acres (397 ha) per year was assumed for the rest of
Fort Mohave Indian Reservation. By 1980 there would be a total additional
development of 980 acres (397 ha) for a depletion of 3,920 acre-feet (5 x
106m3) above the depletion in 197B. From 1980 to 1990 the remaining
9,799 acres (3964 ha) of land on the reservation would be developed for a
total additional depletion of 39,184 acre-feet (48 x 106m3).

The consumptive use of 4 acre-feet per acre (12 000 m3/ha) for irri-
gation of the Fort Mohave, Chemehuevi, and Colorado River Indian lands is
based on the rate presented in Colorado River Basin Project hearings
before the Subcommittee on Irrigation and Reclamation of the Committee on
Interior and Insular Affairs, House of Representatives. This value lS
under study and may be subject to change in future reports.

Chemehuevi Indian Reservation. The Chemehuevi Indian Reservation)
located above Parker Dam, is allocated water by the Supreme Court Decree
to irrigate 1,900 acres (770 ha) of land in California with a maximum
annual diversion from the mainstream of the Colorado River of 11,340
acre-feet (14 x 106m3). The consumptive use required for irrigation of
these lands is estimated to be 4 acre-feet per acre (12 000 m3/ha), which
would result in a main-stream depletion of about 7,000 acre-feet (8 x
106m3) annually. The lands that are irrigable are above the river and
not feasible for farming at this time. It is anticipated that the reser-
vation will develop 7,000 acre-feet (8 x 106m3) of consumptive use for
municipal and industrial and/or irrigation purposes by the year 2000.

Central Arizona Project. The Colorado River Basin Project Act
authorizes the Central Arizona Project for the purpose of furnishing
irrigation and municipal water supplies to the water-deficient areas of
Arizona and western New Mexico through direct diversion or exchange of
water. This project is now under construction with water deliveries
expected in 19B5 to Phoenix and 1987 to Tucson. This project will provide
water to Indian lands and a supplemental water supply to lands now being
irrigated. Water made available to non-Indian lands can be used only on
lands having a recent irrigation history. The Central Arizona Project must
stsnd shortages up to its full allocation if there is insufficient main-
stream water to satisfy an annual consumptive use of 7.5 million acre-feet
(9300 x 106m3) allocated under the Supreme Court Decree of March 1964
to the States of Nevada, Arizona, and California. When shortages occur,

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