WSP08666

• File Number: 8221.112.I
• Description: Central Arizona Project
• State: AZ
• Basin: Colorado Mainstem
• Date: 3/19/1982
• Title: Final Environmental Impact Statement: Water Allocations & Water Service Contracting - Central Arizona Project
• Water Supply Pro - Doc Type: EIS

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amount is reduced until exhausted. Finally the remalnlng Indian
irrigation and tribal homeland amounts are reduced pro-rata with all
M&I uses, based on the scheduled amounts of water (demand) for each
entity in the current year. In addition, effluent exchanges (full
time) are assumed for the Salt River and Gila River reservations in
amounts not to exceed 20 percent of the tribe's allocation prior to
2005, nor more than 50 percent after 2005.

5. Andrus Allocation Modified for Indian Use

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The Indian allocations are the same as Alternative 3, the
differences being in the distribution in times of shortage. This
alternative allocated from 190,242 acre-feet (1985) to 578,010 acre-
feet (2034) annually to 81 M&I entities with the remaining supply to
23 irrigation districts or farming operations. Durin9 shortages,
CAP deliveries are reduced until exhausted to all miscellaneous and
non-Indian irrigation and non-municipal M&I use. Finally, the
Indian allocated amounts are reduced pro-rata with the I~&I
(muni ci pa 1 only) amounts based on the amounts of water actually
de 1 ivered to each entity. There is no 10 percent reducti on in
Indian agricultural use.

6. Agency Proposed Action With 1982 State Recommendations

The Agency Proposed Acti on is to allocate 309,828 acre-feet
annually to 12 Indian tribes for irrigation or for maintaining
tribal homelands. The 1982 State Recommendations ,provide 638,824
acre-feet annually (2034) to 85 M&I entities, with the remaining
supply to 23 irrigation districts or farming operations. During
shortages, CAP deliveries would be reduced until exhausted to all
miscellaneous and non-Indian agricultural uses, then 25 percent of
the Gila River Indian Reservation and 10 percent of other Indian
agricultural uses would be reduced until exhausted. Finally, the
Indi an uses woul d be reduced pro-rata with no more than 510,000
acre-feet of M&I uses, based on amount of water actually del ivered
to each entity. In addition', effl uent exchanges are requi red where
feasible and consistent with contractual provisions. For 'purposes
of analysis in this final EIS, such exchanges are assumed for the
Gila River, Salt River, and San Xavier Indian Reservations, for a
tota 1 of 100,000 acre-feet in yea r 2034, in amounts not be exceed
20 percent of the tribes' allocations prior to 2005, nor more than
50 percent after 2005.

Relationship Between Agency Proposed Action and Alternatives 3 & 4

B.

The proposed allocation contains elements of Alternatives 3 (Andrus)
and 4 (Andrus Modified for M&I). The magnitude of the proposed allocations is
identical, but the distribution of project water during times of shortage
combines elements of both. Under the Andrus allocation (Alternative 3) during
shortages, 10 percent of Indian allocations for irrigation use would be
reduced until exhausted prior to a pro-rata reduction of the remaining Indian
irrigation and tribal homelands amounts with no more than 510,000 acre-feet of

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