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<br />il'J.
<br />
<br />Table 3 shows diversions less measured return flows for the major
<br />water users in the Lower Basin during the past five water years. As
<br />can be seen, Lower Basin use during 1974 increased by 132,000 acre-
<br />feet over the previous year's use.
<br />
<br /> TABLE 4
<br /> D"LIV;;:iUES TO dEHCO
<br /> COLORADO RIVER SYSTE,''j
<br /> 1962 through 1974
<br /> (Thousands of Acre-Feet)
<br /> Scheduled Excess Excess Over
<br />Calendar Deliveries Control Flow to Deliveries Control
<br />Year to I-lexico Schedule r.'iexico to I,lexico Sc hedule
<br />1962 1,500 1,752 1,977 477 225
<br />1963 1,500 1,673 2,003 503 330
<br />1964 1,500 1,536 1,655 155 119
<br />1965 1,500 1,554 1,6$8 18:5 13L~
<br />1966 1,541 1,621 1,656 116 35
<br />1967 1,459 1,515 1,559 100 44
<br />1963 1,500 1,552 1,563 63 11
<br />1969 1,500 1,550 1,566 66 16
<br />1970 1,500 1,553 1,5::53 83 30
<br />1971 1,500 1,548 1,562 62 14
<br />1972 1,500 1,536 1,613* 113 27
<br />1973 1,500 1,621 1,625* 125 4
<br />1974 1,500 1,660 1,665" 165 5
<br />
<br />*Includes 2,591 acre-feet in 1972, 9,405 acre-feet in 1973,
<br />and 9,637 acre-feet in 1974 for deliveries to City of Tijuana
<br />under provisions of I:jinute -Ho. 240 of the International
<br />Boundary and l'Iater Commission.
<br />
<br />Table 4 shows the annual deliveries to I-Iexico since 1962 and
<br />include's data on both total excess deliveries to ,lexico and delive-
<br />ries \vhich are in excess of control schedules. These weekly
<br />schedules of deliveries to I-iexico are Elade up of estimated return
<br />flm-Is froEl projects in the Yllina area, releases froEl Imperial Dam
<br />for sluicing silt mlay from the settling basins and river regulation,
<br />and additional releases required from upstreffin storage. The releases
<br />from upstreffiTI storage are held to the minimum necessary for the sum
<br />of all deliveries to meet the United States' commitments for water
<br />delivery pursuant to the ]I;]exican Water Treaty and the r'Iinutes of the
<br />International Boundary and ilater Commission, and includes an annual
<br />sum of 315 acre-feet of overdelivery to make sure ]l;Iexico receives its
<br />total order. As can be seen from Table 4, river operations in the
<br />past few years have successfully limited the amount of excess water
<br />delivered to Mexico.
<br />
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