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~ DIVERSIONS FROM MAINSTREAM-AVAILABLE RETURN FLOW AND CONSUMPTIVE USE OF SUCH WATER CALENDAR YEAR 1996 STATE OF ARIZONA FINAL RECORDS 09103197 (ACRE-FEET) WATER USER JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL 1/ Diversion at Imperial Dam AI 348306 Pumped from wells 7494 Surface returns from South Gila Valley (S.Gila Canal Wasteway) 39n . Return flew North Gila Valley (6 drains & wasteways) 8700 . Return now South Gila Valley wells (DPOC's) 57368 Return flow Yuma Mesa Outlet Oraln BI 21905 . Return flow protective and regulatory pumping unit CI 5546 . Estimated unmeasured groundwater return tlOW' DI 26692 Return flow share of Gila Main Canal Joss EI 12467 . Subtotal retum flow FI 136655 136662 c:heckfromabove Consumptive Use (see note above) 219145 219138 check from above (A) Total for the North Gila Valley, The Yuma lITigation and the Yuma Mesa Irrigation and Drainage Districts. and 'Unit B'. (B) Estimated at 85 percent of the Yuma Mesa Outlet Drain with balance credited to 'Unit Bt. (C) Estimated at 85 percent of Protective and Regulatory Pumping Unit with balance credited to 'Unit 8'. (D) Estimated at 38 percent of the North Gila Valley Diversion at Imperial Dam plus 14 percent of Yuma Irrigation District diversion at Imperial Dam. (Based on analysis of the USGS Report 83-4220 entitled 'A Method for Estimating Ground-Water Retum Aow to the Lower Colorado River In the Yuma Area') (E) Diversion*milage weighted share of Gila Main Canal loss less canal surface evaporation (1397 aflyr) and phreatophytes (2154 af/yr). (F) Additional unmeasured amounts of return flows from the Yuma Mesa Irrigation and Drainage District, 'Unit B', the Cocopah Indian Reservation, and the Yuma Cotlnty Water Users Association (YCWUA) are utilized to meet consumptive uses in the United States and in partial satisfaction of the Mexican Treaty obligation. Some of thes underground flows are recovered by pumping from wells on the Cocopah Indian Reservation and in the YCWUA area, and by some of the surface drains in the YCWUA area. Efforts will be made to at least quantify these return flows within broad limits by respective water user entities in future yeaf$. 81 Diversion adjusted for delivery to Mohave Valley l. D. D. (Chesney). 9/ Main Outlet Drain retum flov.I credit is measured fby at Station 0+00 and includes both Colorado River and Gila River water. Reclamation is working to develop a method to separate the different sources of retum flow and will apply that methodology when available. 101 W~ter pumped from wells or diverted from the mod for service. potable and irrigation water. c o o (.,;) Co::) c:: 13