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PART VI FUTURE DEVELOPMENT e commingled to some extent. At this time, no attempt to assign commingled or unmeasured return flow is made in the decree accounting for the water users within those projects. This is reflected in the figures assigned for 1982. m. Cocopah Indian Reservation The tribe has a water right to irrigate 431 acres of land or about 1,700 acre-feet of consumptive use. In 1982, its water use amounted to about 1,000 acre-feet. n. Other Uses It is estimated that the many small users with water use contracts will have a consumptive use ranging from about 54,000 acre- feet in 1990 to 51,000 in 2010. o. Protective and Regulatory Pumping Unit e The United States and Mexico signed a treaty in 1944 that allotted Mexico 1,500,OOO acre-feet of water annually. Of this, approxi- mately 1,360,000 acre-feet will be delivered annually to Mexico in the limitrophe section of the Colorado River upstream from Morelos Dam. The remaining 140,000 acre-feet annually are delivered to the Southerly International Boundary and in the limitrophe section of the Colorado River below Morelos Dam. In 1961, the Mexican Government protested the increasing salinity of the Colorado River water entering Mexico. With the approval of both governments, Minute 242 was signed on August 30, 1973, as a per- manent solution to the salinity problem. The Protective and Regulatory Pumping Unit is one of the provisions of Minute 242 to accomplish this. Each country is allowed to pump a maximum of 160,000 acre-feet annually from the ground water wi thin 5 miles of the Arizona-Sonora Boundary. To meet our treaty obligations, 125,000 acre-feet per year are delivered to Mexico at the Southerly International Boundary as part of this agreement, and the re- maining 35,000 acre-feet are for agriculture and municipal and industrial uses in the area. 3. Cali fornia a. City of Needles e The city of Needles has a present perfected right to a consumptive use of 950 acre-feet per year. In 1982 it was estimated the city consumptively used 2,288 acre-feet. At this time, Needles does not have a water use contract with the Secretary of the Interior, so no attempt was made to indicate a source for its future water supply except for its present perfected right. 54