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<br />AZ 71 Summation for the Yuma Mesa Division, consisting of the North Gila Valley Irrigation District, the Yuma Irrigation District, and the Yuma Mesa <br />AZ Irrigation & Drainage District is as follows: <br />AZ Item Annual Totals (Acre-Feet) <br />AZ -------------.----------- <br />AZ Diversion at Imperial Dam AI 177896 <br />AZ Pl.II1peCI from wells 1136 <br />AZ Surface returns from South Gila Valley (S.Gila Canal Wasteway) 1176 * <br />AZ Return flow North Gila Valley (6 drains & wasteways) 3872 * <br />AZ Return flow South Gila Valley wells (DPOC's) 37468 <br />AZ Return flow Yuma Mesa Outlet Drain BI 17043 * <br />AZ Return flow protective and regulatory pumping unit CI 1862 * <br />AZ Estimated unmeasured groundwater return flow 01 15858 <br />AZ Return flow share of Gila Main Canal loss EI 14331 * <br />AZ Subtotal return flow FI 91610 91610 check from above <br />AZ Consumptive Use (see note above) 87422 87422 check from above <br />AZ (A) Total for the North Gila Valley, The Yuma Irrigation and the Yuma Mesa Irrigation and Drainage Districts, and 'Unit B'. <br />AZ (B) Estimated at 85 percent of the Yuma Mesa Outlet Drain with balance credited to 'Unit B'. <br />AZ (C) Estimated at 85 percent of Protective and Regulatory Pumping Unit with balance credited to 'Unit B'. <br />AZ (D) Estimated at 38 percent of the North Gila VaHey Diversion at Imperial Dam plus 14 percent of Yuma Irrigation District diversion at <br />AZ Imperial Dam. (Based on analysis of the USGS Report 83-4220 entitled 'A Method for Estimating Ground-Water Return Flow to the <br />AZ Lower Colorado River in the Yuma Area') <br />AZ (E) Diversion*milage weighted share of Gila Main Canal loss less canal surface evaporation (1397 af/yr) and phreatophytes (2154 af/yr). <br />AZ (F) Additional unmeasured amounts of return flows from the Yuma Mesa Irrigation and Drainage District, 'Unit B', the Cocopah Indian <br />AZ Reservation, and the Yuma County Water Users Association (YCWUA) are utilized to meet consumptive uses in the United States and in <br />AZ partial satisfaction of the Mexican Treaty obligation. Some of thes underground flows are recovered by pumping from wells on the <br />AZ 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 <br />AZ quantify these return flows within broad limits by respective water user entities in future years. <br />AZ 81 Diversion adjusted for delivery to Mohave Valley I. D. D. (Chesney). <br />AZ 91 Main Outlet Drain return flow credit is measured flow at Station 0+00 and includes both Colorado River and Gila River water. Reclamation <br />AZ is working to develop a method to separate the different sources of return flow and will apply that methodology when available. <br />AZ 10/ Includes 1 river pump and non-taxable tribal usage delivered by the Town of Parker. <br />