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<br />. <br /> <br />. <br /> <br />. <br /> <br />i8S, <br /> <br />U. S. ARMY ENGINEER DISTRICT, OMAHA <br />CORPS OF ENGINEERS <br />6011 U S POSI OfFICE AND COURT HOUSE <br />OMAHA. N[BRASKA 68102 <br /> <br />aOQ'lss,(PlIIO <br />QISllICT(IlGlllfl' <br />U. S Ull~ [IlGIIlll. OISI'I(I OMA~A <br />iCllU S.POSIOIFIC{ '1l0CDU.IMOUS( <br />m 1l0RlM 111M SIII(l <br />OIUM. 1I[8'.SU 61]07 <br />'[IIRIO <br /> <br />MROGR-A <br /> <br />14 September 1965 <br /> <br />Mr. H. P. Dugan <br />Director, Regional Office, Region 7 <br />Bureau of Reclamation <br />Building 46, Denver Federal Center <br />Denver, Colorado <br /> <br />Dear Mr. Dugan: <br /> <br />In accordance with the discussions with Mr. Berg and members of <br />your Project Development Staff on 26 July 1965, "" have completed an <br />evaluation of the flood control requirements for the Narrows unit. <br />Because of the relatively short period of time available for completing <br />this study, the information furnished in this letter has not been reviewed <br />by our Missouri River Division. Therefore, benefit and storage values <br />presented herein are subject to change. <br /> <br />Average annual flood damages and flood control benefits, as related <br />to the Narrows project, were developed on the basis of existing condi- <br />tions and 1965 price levels. These evaluations considered that the <br />Chatfield Dam and Reservoir project would be in operation. Computations <br />were based on conditions with and without diversion of Bijou Creek flows <br />and the operation study furnished by your office. On these bases, average <br />annual flood damages are est:imated at $1,730,000. Average annual flood <br />control benefits attributable to the Narrows project would be $961,000 <br />without diversion of Bijou flows and $1,123,000 with diversion of Bijou <br />flows. <br /> <br />In order to obtain the above cited flood control benefits the <br />amount of flood control storage required at the Narrows project would be <br />550,000 acre-feet and outlet capacity up to 10,000 cubic feet per second <br />would have to be available. If you so choose, 75,000 acre-feet of tbe <br />550,000 acre-feet could be joint-use storage, to be available in early <br />spring each year. <br />