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<br />o Intake structure. <br />The intake structure and associated features should be <br />designed to allow inexpensive, low maintenance regulation of <br />influent to the pond. Locating the intake ~,iven the <br />available hydraulic conditions and physical cons.traints will <br />require careful consideration. The intake flow required for <br />the fish ponds will depend on the seepage rate from the <br />pond, the surface evaporation rate, the irrigation <br />requirements (if drawn from the pond), flow adjustments <br />needed for water quality or temperature cont:rol, and the <br />excess flow desired for the waterfowl areas. <br /> <br />A study of the intake feature design parame.ters and <br />alternatives is presented in section 9" <br /> <br />o Elevation and structural quality of the diking. <br />The elevation of the existing diking of the pond area <br />does not meet FEMA standards for flood protection against a <br />IOO-year flood from the Gunnison River. The standard <br />requires that the dike have at least a 3-foot freeboard <br />above the IOO-year flood elevation. At least one location <br />along the dike is too low to meet similar requirements for <br />the Uncompahgre River. A check of the pond dike elevations <br />reveals that the dike is at least a1: the same elevation as <br />the IOO-year flood elevation. <br /> <br />The tabulation below shows the existing dike elevations <br />at the corners of the north and south cells of the existing <br />abandoned sewage lagoon, and the elevation of the <br />Uncompahgre and Gunnison Rivers IOO-year flood elevations at <br />those corners, based on 1983 hydrology. <br /> <br /> Uncompahgre R" Gunnison R. <br /> Existing lOO-year lOa-year <br />Location Elevation ---Llood El. __.. Flood El. <br />North Cell <br />NE corner 4929 4925 4927 <br />NW corner 4927 4923 4924 <br />SW corner 4927 4925 4925.5 <br />SE corner 4929 4926 4928.5 <br />South Cell <br />NE corner 4929 4926 4928.5 <br />NW corner 4929 4925 4925.5 <br />SW corner 4928 4928 4928 <br />SE corner 4930 4929 4929 <br /> <br />The geometr-y of the existing dike appears to be <br />sufficient to allow pat:rol vehicles to traverse the pond <br />periphery. Alt1.ough no information is available about the <br />material comprising the dike to allow assessment of its <br />structural adeq~acy, the dike has served successfully as a <br /> <br />9 <br />