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<br />375i <br /> <br />HUED! DA.l\1 AKD RESEfi\'OIfi, COLO. <br /> <br />.59 <br /> <br />Hi,'el' below the Rlledi Dam site and a.long t.he main stream of the <br />Roaring Fork Riyer below Basalt was estimated at about $:3[,,000 <br />for that. flood. <br />The l2lans for the. Rnedi Dam proyide for an earthtillstn",ture, <br />about 210 feet In heIght aboye st.reilIllLed, wIth an ungatcd sp1l1wtl,Y <br />and "it.h a tot:ll reservoir capacity of about, 100,000 acre-feet at <br />'''; spillway-crest elevat.ion (i,iG4 feet "bO\'e sea, le,'el). The acti,'e <br />~aplleity would be avont 82,00U acre.-feet. The. outlet works would ImYlj <br />a. discha.rge ca.pa.city of about 1,000 cubic feet pel' second at. millim,ulll <br />head and about ~,OOO cuhic feet per secolld at. spillwa.y-crest elevlltlOn. <br />The reservoir provides for repl:'H.:emeIlt, stoI'a~e in conned.ioll wi rh the <br />proposed Fryingpan-Arlmnsas diversion proJect a.nd the entire :lL't.i\'B <br />storage capacity below spillway cre~t is assigneu to water conservation. <br />The dam would be located at about ri,.er mile. 13.5 on the Fryingpan <br />River, and the reservoir would hnye a drainage area. of about 227 <br />square. miles. With the. outlet ""'pacity as planned, the entire ",nount <br />of active storage could be evacuat.ed In about :30 days. If carefully <br />operated for flood control by evacuation of the a.etive storage on the <br />basis of foreca.sts of snowmelt inflow, a.lmost. complete control of snow- <br />melt floods at. the damsite probably could he obtained. <br />The average annua.I future flood damage. from uncont.rolled SIlOW. <br />melt. floods is estimated as follows: on t,he. FryingpaJl Ri Vel' below the <br />Ruedi Dam site, $500; and 011 the Roaring }'ol'k River below Basalt, <br />$4,.500. The ltVerage annual future damage from uncontrolled snow- <br />melt. floods on the Colorado Ri,'er between (Henwood Sprillg5 and <br />9'rand .Tunction hn.s not been uefinitely estimated hut it appears that <br />It ""uld be at least $11,000. The total of these potential flood damages <br />from uncontrolled snowmelt floods amounts to at least $16,000 an- <br />nually. The operat.ion of the Ruedi Dam and Reservoir for control <br />of snowmelt flood could prevent from $8,000 to $15,000 of a,vera"e <br />allllUal flood damage. The upper limit of $15,000 is a very tentati~e <br />figure because of a lack of presently available data on floods all(1 on <br />flood damage along the Colorado River. <br />Very trnly YOllI'S, <br /> <br />C. T. N:EWTON. <br />Col<Jnel, Cor1'8 0/ Engi1l€eI's, Di"/1'iot Enghieer. <br /> <br />f <br /> <br />.~ <br />j <br />-, <br /> <br />