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<br /> <br />2 <br /> <br /> <br />control effects downstream from each site as a result of their operation. <br /> <br /> <br />Howe.ver, none of the reservoirs has" epecific flood control function. <br /> <br /> <br />Information concerning each of these structures is presented below. The <br /> <br /> <br />eight off-stream reservoirs are Mayham, Calkins, Pomona, Hyatt, Tucker, Upper <br /> <br /> <br />Long and Lower Long Lakes. Runoff from the small areas draining into these <br /> <br /> <br />lakes was considered non-contributing in the hydrologic analysis. <br /> <br /> <br />b. Ralston Reser'Toir. Ralston Reservoir was buUt in 1938 by the City <br /> <br /> <br />of Denver. It receives water from Ra1ston and South Boulder Creeks and is <br /> <br /> <br />used for municipal water supply. The outlet \/Orks deliver water to the <br />Moffat Treatment Plant and have the capability of forcing the natural inflow <br />back into Ralston Creek. Although Ralston Reservoir is not ope-.ated for <br />flood control purpose s, there is approximately 2,400 acre-feet of storage <br />available between the primary spillway crest at elevation 6046.0 feet m.s.l. <br />and the top of the dam at elevation 6060.0 feet m.s.!. which provides <br />incidental flood control. <br />c. Maple Grove Reservoir. Maple Grove Reservoir is located on Lena <br />Gulch at West 27th Avenue, Lakewood, Colorado. It is owned by Consolidated <br />Mutual Water Company and is used for municipal water supply storage. The <br />reservoir provides sc,me attenua.tion of flood peaks. Approximately 452 <br />acre-feet of storage are available between the crest of the inlet at <br />elevation 5520.0 feet m.s.l. and the top of the Fabridam at elevation 5531.0 <br />feet m.s.l. <br />d. Leyden Lake. Leyden Lake is an irrigation water storage reservoir <br />on Leyden Creek upstream from Indiana Street. There are apprOXimately 550 <br />acre-feet of uncontrolled storage between the spillway crest at 5612.0 feet <br />m.s.!. and the crest of the dam at elevation 5620.0 feet m.s.l. <br />