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Projected Plan of Operation - Water Year 1982 t~ ....- ~~~. Mounlain snow holds future runolf. A proposed operation plan for water year 1982 for the Colorado River reservoir system was formulated and distributed to representatives of the Colorado River Basin States during November 1961, The plan was prepared in accordance with the operating criteria published June 4. 1970, in compliance w,th See, 602, Public Law 90-537, The plan reflects domestic use, irrigation, hydroelectric power generation, water quality control, flood confrol, fish and wildlife propagation, recreation, and Colorado River Compact requirements. On September 30, 1961, storage in Lake Powell was 1.1 million acre-feet less than the storage in Lake Mead, Therefore, the proposed operation plan tor average runoff conditions is based on a release from Lake Powell of 6,23 million acre-feet At fhe end of waler year 1962, storage in Lake Powell Will be equai or iess than lhe storage In Lake Mead with this minimum objective release. The 1982 operating plan for average, most adverse, lower and upper quartile conditions calls 10r releases from Lake Mead limited to satisfying minimum downstream consumptive use requirements only. The projected operation lor average runoff conditions for each reservoir in the Colorado River Basin for water year 1982 is described in the following pages, Charts 1-8 show the projected mont>lly outflows tram the reservoirs, the projected end-of-month elevation, and active storage in the reservoirs for average and also three other assumptions ot the 1962 moditied runoff from the basin, The four assumptions are: (1 ) Average based on the 1906-80 record runoff; (2) Upper quartile based on the level of annual st~eam~\ow wn\ch has been exceeded 25 percent of the time du ring 1906-60: (3) Lower quartile based on flows exceeded 75 percent of the time during 1906-80; and (4) Most adverse based on the lowest ~ear af record, which was 1977. Prpe for the Havasu Pumping Plant discharge line 5