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<br />LAKE MINNEQUA HYDROLOGY & HYDRAULICS <br /> <br /> <br />Four major drainage areas drain into Lake Minnequa. Their concentration <br /> <br /> <br />points are: 12A, 12C, 12J, 12K. For purposes of this analysis, they are <br /> <br /> <br />called basin A, C, J, &, K respectively. <br /> <br />Data supplied by CF&I Eteel Corp. indicate normal WSEL in Lake Minnequa <br /> <br /> <br />is 4793.3 to 4798.7 ft. msl. Flow can take place out of the lake to the <br /> <br /> <br />I19rtheast by a 21" conduit fed through a grated inlet flowing into city <br /> <br /> <br />storm sewers, or through a 24" pipeline to the CF&I plant, or over Lake <br /> <br /> <br />Avenue flowing overland through city streets. The two former outlets are <br /> <br /> <br />assumed ineffective dilring a flood event due to either trash catching on <br /> <br /> <br />inlets or gates, coupled with small capacity and low head. Therefore, <br /> <br /> <br />flows for the 10-, 50-, 100-, & 500-year flood events are routed through <br /> <br /> <br />the lake and over Lake Avenue. <br /> <br />INFLOW HYDRO GRAPHS <br /> <br />Peak flows at concentration points 12A, 12C, 12J, & 12K are available <br />as detailed in Pueblo, GO FIS hydrology report of Feb. 1977. They were <br />computed using U.S.G.S. regression equations (p. 6 of above report). To <br />perform a routing through the lake, it is' necessary to develop flow <br />)lydrographs at the concentration points. Inflow hydrographs are developed <br />by applying TP-40 rainfalls to the unit hydrograph for each area. The <br />inflow hydrographs are eombined, then routed through Lake Minnequa by <br /> <br />S + ~ routing. <br />STORAGE INDICATION CURVE <br /> <br />For the routing, stage-storage-outflow relations are developed for Lake <br />Minnequa. Sole outflow is over Lake Avenue through Sec 1110. Effective <br />width of flow is 450 ft. due to obstruction posed by buildings. Volume <br />generated by the 0.25 mi.2 area north of l2J is computed and treated as <br />starting storage added to cooling water stored in Lake Minnequa to an <br />'elevation of 4798.7' msl. <br />