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<br />. <br /> <br />. <br /> <br />. <br /> <br />For the Yuma Mesa it is evident that many factors not common to <br />other areas must be considered. Tbese include, among others, the <br /> <br /> <br />Mex.ican complication, the atudies of return flow made by consultants <br /> <br /> <br />on behalf of the Yuma County Water Users' Association and the Mexican <br /> <br /> <br />Section of the International Boundary and Water Commission, and the <br /> <br /> <br />electric analog study of Yuma area ground water being conducted Jointly <br /> <br /> <br />by the Geological Survey, the International Boundary and Water Commission, <br /> <br /> <br />and the Bureau of Reclamation. <br /> <br />n. River. Diversion and Return Flow Measurements <br /> <br /> <br />A fairly cCllllprehensive program of measurement of surface flows has been <br /> <br /> <br />developed and is in operation in the lower Colorado River basin. <br /> <br />The Geological Survey maintains river gaging stations at Lees Ferry, <br />Grand C~on, below Hoover Ds.m, below Davis Dam, at Topock, below <br /> <br /> <br />Parker Dam, below Palo Verde Dam, below Cibola Valley. at Imperial Dam, <br /> <br /> <br />and at Yuma. The International Boundary and Water Commission operates <br /> <br /> <br />a station at the Northerly International Boundary. Records of flows at <br /> <br /> <br />all of these river stations are published in the Geological Survey's <br /> <br /> <br />Water Supply Papers. <br /> <br />The Geological Survey operates or checks the operation of gaging <br /> <br /> <br />stations at most of the points at which water is diverted from and <br /> <br />4 <br />