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Projected Plan of Operation- Water Year 1983 "- Can81elltavatlon -1983. A proposed operation plan for water year 1983 for the Colorado RIver reservoir system was formulated and distributed to representatives of the Coloredo River Basin State. during October and November 1982, The plan was prepared In accordance with the Operating Criteria published June 4.1970, in compliance with Section 602, Public Law 90-537. The plan reflects operatIon for flood control, domestic and IrrIgation use of water, hydroelectric power generation, water qualIty control, fish and wildlife propagatIon, recreation, and Colorado River Compact requirements. The plan calls for B minImum objective release from Lake Powell of 8,23 million acre-feet under lower quartile Inflow conditions, or le8s. Under most probeble to upper quartile Inflow conditions, the scheduled releases trom Lake Powell are projecled to range from 9,8to 12,0 mIllion acre-feet In order to equalize storage with Lake Mead by the end of September 1983. The projected operation for average runoff conditIons for each reservoir In the Colorado River Besln for water year 1983 Is described In the following pages, Cherts 1-8 show the projected monthly outflows from each reservoir for four assumed hydrologic conditions. Each condltlon reflected the most current hydrologic Information available by Including actual forecasted October and November 19821nfJows, Inflows for the remainder of the year were based on the following essumptlons of 1983 modified runoff trom tne Basin: (1) everage based on tne1906- 1981 record of runoU; (2) upper quartile based an the an,nuallevel of streamflow which has been exceeded 25 percent of the time during 1908-1981; (3) lower quertlle based on flows exceeded 75 percent of the time during 1906- 1981; end (4) most adverse based on tnelowest year of record, which was 1977, Inlpectlon of Hoasayempe discharge line, 5