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<br />,.. <br /> <br />c. General Filling Schedule and Release Procedures <br /> <br />The West Slope Area Branch, Power Division, is responsible for operating <br />Lake Granby according to the Annual Operating Plan and under the guid- <br />ance of the Water Scheduling Division, South Platte River Projects <br />Office. <br /> <br />Inflow into Lake Granby is from two sources: (1) natural runoff from <br />the drainage area above the lake and (2) water collected and stored in <br />Willow Creek Reservoir and pumped to Lake Granby. The maximum histori- <br />cal daily inflow during recent years was about 141.5 m3/s <br />(5000 ft3/s)J which occurred in 1952 and 1957. A maximum storage <br />content is normally reached following the spring runoff near the end of <br />June. The lake is usually lowered to its yearly minimum storage by the <br />end of April. <br /> <br />Releases from Lake Granby can be accomplished by three means: (1) the <br />outlet works, constructed as an integral part of Granby Dam, (2) the <br />spillway next to the left abutment of the dam, and/or (3) the three <br />pumping units at the Granby Pumping Plant, Releases through the outlet <br />works and the spillway discharge into the Colorado River, The flow from <br />Granby Pumping Plant discharges into Granby Pump Canal for delivery to <br />Shadow Mountain Lake. <br /> <br />The outlet works in the dam have a combined capacity of 12,2 m3/s <br />/4,0 ft3/~). The spillway has a design capacity of 325.5 m3/s <br />~ (11 500 ft Is) at a water surface elevation of 2523,74 m (8280 ft), and <br />tne liranby Pumping Plant has a total design capacity of 17 m3/s <br />(600 ft3/s). <br /> <br />Releases from Lake Granby to the Colorado River will generally be <br />1 imited to the amount required by the "Principles to Govern the Release <br />of Water at Granby Dam to Provide Fishery Flows Immediately Downstream <br />in the Colorado River" (exhibit 5). The following excerpts from the <br />above document shall be used as a guide in making releases from Lake <br />G~n~: . <br /> <br />". . .(1) The schedule of releases from Granby Reservoir set out <br />below is established as the Secretary's final determination, except <br />as hereinafter modified. . <br /> <br />65 <br />