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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />l~ 1 <br />HydroMeteorological Report No. 49. Preliminary soil information <br />identifying four dominant' soil complexes within the basin was <br /> <br />obtained from the SCS. Cover characteristics were based on previous <br /> <br />field observations by W.W. Wheeler personnel. The rainfall <br /> <br />distribution was patterned on the PMP distribution criteria of the <br /> <br />COE Southwest Division. <br /> <br />The flood hydrographs were developed by modeling of the drainage <br /> <br />basin above the reservoir site using the COE HEC-l computer program. <br /> <br />The peak flow and total flood volume for the estimated flood events <br /> <br />derived for Dam Site 9 are as follows: <br /> <br />TABLE D.8 <br /> <br />ESTIMATED FLOOD EVENTS AT DAM SITE 9 <br /> <br />100-Year <br />Flood <br /> <br />PMF <br /> <br />IDF <br /> <br />FDF <br /> <br />Peak flow - cfs l4,900 <br />Total Volume -AF <br /> <br />72,500 <br />13,400 <br /> <br />21,900 <br />80,600 <br /> <br />38,lOO <br />20,400 <br /> <br />38,400 <br /> <br />D.4.9 <br /> <br />Final Site Selection <br /> <br />A conventional zoned earth embankment dam configuration was selected <br /> <br /> <br />for "the preliminary comparison of the cost of the three alternative <br /> <br />sites. Based on the limited data available regarding the amounts of <br /> <br />sediment carried by the streamflows in the area, dead storage <br /> <br />capacities of 200 AF for Sites 5 and 8 and lOOO AF for Site 9 were <br /> <br />selected. The dam foundation at all three sites was assumed to <br /> <br />include a cutoff trench 80 feet deep to bedrock. <br /> <br />26 <br />