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<br />1 ';"~3
<br />
<br />Table 3 shewe, dl vel'sion8 18ss mea:ol'xed ret'lrn flows for the
<br />major uater users in the L01'fer Basin during the past five 1'1ater years.
<br />As can be seen, LO\ler B8.sin use during 1973 increased by 165,000
<br />acre-feet over the previous YGar's use.
<br />
<br /> TABLE 1:.
<br />,.
<br /> DELIVERIES TO I.'IEXICO
<br /> COLORADO RIVER sysmI1
<br /> 1962 through 1973
<br /> (Thousands of Acre-Feet)
<br /> Scheduled Excess Excess Over
<br />Calendar Deliveries Control Flm'l to Delivo.ries Ccintrol
<br />Year to f.Iexico Schedule !:lexico to Nexico SchedulE>
<br />1962 1,500 1,752 1,977 1:77 225
<br />lq63 1,500 1,6'/3 2,003 503 330
<br />196~ 1,500 1,536 1,655 155 119
<br />1965 1,500 1, 55~. 1,6M 183 131:.
<br />1966 1,51,1 1,021 1,656 116 35
<br />1967 1,1:59 J.,515 1,559 100 hI,
<br />196$ 1,500 1,552 1,563 63 11
<br />1969 1,500 1,550 1,566 66 16
<br />1970 1,500 1,553 1,583 83 30
<br />1971 1,500 1,%3 1,562 62 ll,.
<br />1972 1,500 1,586 1,613-" 113 27
<br />1973 1,500 1,621** 1,625" 125 4
<br />
<br />"Includes 2,591 acre-feet in 1972 and 9,1,05 acre-feet in 1973 for
<br />deliveries to City of Tijuana under provisions of I.linute No. 21,0
<br />of the International Boundary and Hater Commission.
<br />**Control Schedule amount for 1973 of 1,620,61,0 acre-feet \vas
<br />1,501 acre-feet more than the total amount delivered in satisfaction
<br />of the Treaty and LB.1J.C. I>Iinutes of 1,619,139. Thl's, the total
<br />over delivery to i.1exico for 1973 was about 6,000 acre-feet (See
<br />Table 5).
<br />
<br />r
<br />
<br />Table 1:. shows the annual delive-des to iTexico since 1962 al'd
<br />includes data on both total excess ci8!..i.,-er:i.es to I.'jexico and deliveries
<br />which are in excess of control Gch<J(,u:I.2s. Tl1ese ,'mekly schedules
<br />of deliveries to I.lexico are made up of est.:i.r.lat.ed return flO\'1s from
<br />projects in the Yuma area, releases L'Cf.i Imnerial Dam for sluicing
<br />silt away from the settling basins and riv6i' regulation, and addi-'
<br />tional releases req1.Jired ~roill up3trear,1 :3torage. The releases from
<br />upstream stor:,ge are helrl. to the minimum necessary for the sum of
<br />all deliveries to meet the United States' commitments for llater
<br />delivery pursuant to the I.1e:dcan Hater Treat.y and the Ihnutes of the
<br />Internatif)nal 1'0vndcTY and Hater Ccm~]ission. As can be seen from
<br />Table 4, J.'i ver op3ratioi1 in the past fe\"l years has successfully
<br />limi ted. the 2JilO'-lEt of excess water delivered to nexico.
<br />
<br />- 5 -
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