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<br />-3-
<br />
<br />.
<br />
<br />allotment of 1,500,000 acre-feet to Mexico. The amount of 83,000 acre-feet, over
<br />the allotment, consists of: a) 53,900 acre-feet of Wellton-Mohawk drainage by-passed
<br />under Minute No. 218 operations by the United States, and b) 29,100 acre-feet, less
<br />than 2% of the total deliveries, which was due principally to upstream irrigation cut-
<br />backs during and following periods of rainfall in the United States. Total flows reaching
<br />Mexico and their sourceS for the past five years are tabulated as follows:
<br />
<br /> COLORADO RIVER FLOWS TO MEXICO
<br /> Calendar Year Totals in Acre-Feet
<br /> Source of Waters Reaching Mexico
<br /> Total Waters From Return
<br /> Reaching Treaty Allotment Above Flows Below
<br /> Mexico (Schedul ed Del iveri es) Imperial Dam Imperial Dam 1)
<br /> 1966 1,656,140 1,500,00 plus loan 1,104,070 552,070
<br /> of 40,535
<br /> 1967 1,558,980 1,500,00 less loan 1,063,090 495,890
<br /> re turn of
<br /> 40,535
<br />. 1968 1,562,740 1,500,000 1,059,360 503,380
<br /> 1969 1,565,780 1,500,000 1,056,250 509,530
<br /> 1970 1,582,6002) 1,500,000 1 082 1002) 500 500 2)
<br /> , , ,
<br />
<br />The effective control on waters reaching Mexico beginning in 1967, as shown in the
<br />preceding table, reflects the benefits of regulation performance of Senator Wash Reservoir
<br />by the Bureau of Reclamation. The effectiveness of this control is further shown by the
<br />daily hydrographs of total deliveries to Mexico and Mexico's schedul e of requests,
<br />reference Exhibit 4.
<br />
<br />The preceding table shows that of the total quantity of waters reaching Mexico in 1970,
<br />about 68% was from the river above Imperial Dam, i.e., primarily from storage, and the
<br />remaining 32% from the return flows to the river below that Dam, not including returns
<br />from the Imperial Dam desilting basins nor gate leakages.
<br />
<br />.
<br />
<br />1) Including flows crossing land boundary at San Luis.
<br />
<br />2) Last two months estimated.
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