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<br />0014G~ <br /> <br />This data showed the average actual flow to be 17.3 m.a.f.91 <br />Estimates of net depletions above Yuma varied from 3,294,450 <br />acre-feet to -3,782,500 acre-feet,92 and, when added to the <br />actual measurements, they yielded a virgin flow of 20.06 <br />m.a.f. to 21.08 m.a.f. The Commissioners also estimated the <br />actual flow of the River at Lee's Ferry at 16.4 to 17.0 <br />m.a.f.93 They estimated Upper Basin depletions at 2,180,7S0 <br />to 2,SOO,000 m.a.f.94 Thus, the virgin flow of the River at <br />Lee's Ferry was calculated to be from 18.6 to 19.5 m.a.f. per <br />annum. <br />Subsequent statements by the Commissioners after the <br />signing of the Compact repeated these or similar figures.95 <br />Thus, on January 27, 1923, Herbert Hoover wrote Congressman <br />Carl Hayden of Arizona that there would be 4.0 to 6.0 <br />m.a.f. in the Colorado River after both Basins had used their <br />full apportionment of 16.0 m.a.f.96 In 1925 Arizona's <br />Compact commissioner W.s. Norviel testified before a Senate <br />committee that the virgin flow of the River averaged 20 <br />m.a.f.97 <br />Other witnesses before Congress presented similar <br />data.98 Also, the "Weymouth Report,"99 completed by the <br />Interior Department and submitted to Congress in 1924, <br />determined the total water supply to be 19.7 m.a.f. per <br />annum, which figure also accounted for evaporative losses on <br />the mainstream and the Gila.100 However, in 1928 another <br />official report to Congress, the "Sibert Report,"lOl cast <br /> <br />-39- <br />