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<br /> TABLE 7 <br />.. ".'1 ~ DELIVERIES TO MEXICO <br />lCJ'i <br /> COLORADO RIVER SYSTEM <br /> 1970 through 1979 <br /> (Thousands of Acre-feet) <br /> Scheduled Excess Excess Over <br />Calendar Deliveries Control Flow to Deliveries Control <br />Year to MexiCO Schedule Mexico to Mexico Schedule <br />1970 1,500 1,553 1,583 83 30 <br />1971 1,500 1,548 1,562 62 14 <br />1972 1,500 1,586 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 />1975 1,500 1,717 1,728* 228 11 <br />1976 1,500 1,706 1,774* 274 68 <br />1977 1,500 1,717 1,779* 279 62 <br />1978 1,500 1,703 1,727* 227 24 <br />1979 1,700 3,196 3,345* 1,645 149 <br />* Includes deliveries to City of Tijuana on an emergency <br /> basis since 1972 pursuant to Minute No. 240 of the <br /> International Boundary and Water Commission. <br />Power ' <br /> <br />The production of hydroelectric power in Colorado River Basin power <br />plants constitutes a vital resource to the Basin states, both for the energy <br />generated and for the power revenues received. Tables 8, 9, and 10 show <br />key aspects of hydroelectric power generation in 1979. <br /> <br />Operating levels and characteristics of the major reservoirs, except <br />Lakes Mohave and Havasu, at the beginning and the end of the water year are <br />shown in Table 8. Lakes Mohave and Havasu were held at relatively constant <br />levels. All reservoirs except Crystal, Blue Mesa, and Fontenelle stayed <br />above rated head elevation throughout the water year. Statistics on <br />operating year water releases from Hoover Dam and electric generation are <br />shown in Table 9. Generation at Hoover Dam during the '1978-79 operating <br />year was 4.3 percent below the previous operating year. <br /> <br />The Colorado River Board's 1963-64 Annual Report contains details of <br />the 1962 Glen Canyon Filling Criteria. These criteria establish an account- <br />ing system to handle the reduced Hoover generation caused by initial filling <br />of the Colorado River Storage Project (CRSP) reservoirs. Table 10 shows <br />the monthly values for the 1979 operating year and water year of the fim energy <br />deficiency. <br /> <br />-7- <br />