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<br />. <br /> <br />( n":::' <br />\iJ.)" <br /> <br />The Operating Plan for the 1971 Water Year <br /> <br />Three detailed monthly operation studies have been made which simulate <br />the proposed operation of Ruedi Reservoir and Turquoise Lake. Two of <br />the studies simulate operations with extremely high or extremely low <br />water supply conditions. Reservoir inflow in 1971 has a 1-in-10 chance <br />of being less than the reasonable minimum and a 1-in-l0 chance of being <br />greater than reasonable maximum. Therefore, :lCtual operations in <br />1971 have an 8-in-10 chance of falling within the limits of the extreme <br />studies. The third study simulates operations with most probable water <br />supply conditions. <br /> <br />In preparing the operation studies, it was intended to provide the neces- <br />sary flexibility to change from one set of conditions to another. The <br />ever-changing situation regarding inflows, downstream requirement, etc., <br />will require many adjustments. Operation schedules will be adjusted as <br />required. Forecasts of the April through July reservoir inflow will be <br />started on March I, 1971, and continue on the first of each succeeding <br />month through May 1. <br /> <br />. <br /> <br />Ruedi Reservoir <br /> <br />Operation of Ruedi Reservoir through November 15 is in compliance with <br />a request by fish and wildlife interests. Releases from the reservoir <br />are to be held to 100 c. f. s. for the period October 1 through November 15. <br />TIIen, in order to provide maximum flood protection below the dam, the <br />reservoir will be drawn down by March 31 to a point where refilling <br />would be assured Imder reasonable minimum inflow conditions, theoreti- <br />cally to 61,400 acre-feet. In actual practice, an estimate of probable <br />inflow would be made early in March based on March 1 snow forecast, <br />and drawdowll would be adjusted accordingly. Also in practice, icing <br />conditions on the Fryingpan River below Ruedi Dam might dictate a re- <br />duction in releases. <br /> <br />After April I, under reasonable minimum inflow conditions, the reservoir <br />would refill by July 1 if only required fish bypasses were made and the <br />remaining inflow stored. Under reasonable maximum and most probable <br />inflow conditions, the reservoir could theoretically be drawn down to <br />47,500 acre-feet, a value controlled by the designers criteria of a mini- <br />mum reservoir drawdown of 5 feet per week. In each case, the reservoir <br />would be full by the first of July in compliance to a request by recreation <br />interests. <br /> <br />. <br /> <br />10 <br />