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0020~3 Operating Plan 1966 . CHAPTER III - ANNUAL OPERATING PLAN FOR 1966 WATER SUPPLY The water supply outlook for 1966 is generally excellent. Even under reasonable minimum conditions, we expect to be able to meet the irrigation requirements of 121,860 acres of Kansas River Project lands expected to be irrigated, and the municipal demands of Norton, Beloit, and Russell, Kansas. For forecasting purposes, values of annual inflows that will be statistically equaled or exceeded 10, 50 and 90 per cent of the time were selected from the probability curve to be "reasonable maximurn~ "most probable. It and "reasonable minimum'l inflow conditions. The estimates for 1966 are shown in Table 2 and are graphically compared with the historical inflow records in Exhibits 21 through 31. Opera- tion analyses for the three conditions have been prepared for 1966 and are shown in Table 11. RESERVOIR OPERATIONS . At the end of the irrigation season, the carryover storage in each reservoir and the reasonable minimum inflow are evaluated to determine if water in excess of that required to fill the conservation pool may be anticipated. If excess inflow is apparent, controlled releases will be made to accomplish maximum downstream benefits. However, this plan is not used for Bonny Reservoir as winter releases are undesirable. Insofar as practicable flood releases from Kirwin and Webster Reservoirs, combined with natural flow will be held to the capacity (2,000 c.f.s.) at the construction crossing at Glen Elder Dam. Surplus storage from Bonny and Norton Reservoirs will again be available under Warren Act Contract. It is not anticipated that surplus storage will exist in other reservoirs or lakes under t1reasonable minimum" or "most probable" inflow conditions. Exhibits 1 through 11 shows the probable effects on each reservoir for 1966 under "most probable." "reasonable minimum. It and "reasonable maximum" inflo;l conditions. Bonny Dam and Reservoir . There is no expected demand on Bonny Reservoir. Continuous winter re- leases are undesirable because of the exposed Hale Ditch outlet pipe. Releases in extremely cold weather are not necessary if the pool level is at least three feet below the top of the conservation pool in the fall. To reduce the chances of a large fall drawdown, the reservoir pool is lowered to elevation 3670.0 (37,390 acre-feet) by the end of March and maintained there or below throughout the spring and summer months except for flood control operation. During the dry years, the normal reservoir losses will lower the pool another two to three feet 12