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. . . 0896 Mr. Frank Bell, District Engineer, Surface Water Branch, Denver, Colorado, comments as follows: "The flood control features of the project were determined by the Corps of Engineers and the irrigation phases were investigated by the Bureau otRecl_tion. Both agencies used all available stream flow records in their studies......The Corps of Engineers determined the average annual water supply at the Dam site would be 57,810 acre-feet and the Bureau ot Recl_tioD determination is 65,100. ' The Engineer eliltimate is believed to be conservative......... *_*MUUU "The repo;rt contains a tabulation of all flood peaks above 15,000 cfs during the period 1921-50, and the frequency study is based upon this and data for prior years. In connection with the couipilation of gaging station records in the Al'kansas River basin, subsequent study may necessitate revision of SODle of the peak discharges previously published. It is not believed that such revisions as may be made will seriously atf'ect the flood frequency studies contained in this report." ,Mr. Bell also says, "The report presents no data to indicate the etfect of the proposed project on the flow of the Al'kansas River...." It is the feeling of Mr. Bell that the Arkansas River Compact Administration would be concerned with this matter. The Geological Survey concurs. in the ,report's .recommeDdations that existing stream gaging stations on the streams be continued, that additional stations be established, and that quality records be obtained at two existing stations. It further concurs in the recOlllllleDdation that :funds be appropriated to Interior Department Geological ~urvey to finance these basic investigations. It is recommended that, should appropriations not be made to the Geological Survey in: a sutf'icient amount, that the sponsoring agencies of the ' project finance the 'stream flow investigations until sufficient :funds are 8'ppropriated to the Geological Survey. The report does not mention, the requirements of facilities to measure inflow to and outflow from the proposed reservoir, but it is understood that such facilities are, included in the project. It is recommended, ho~ever, that recommendations for these facilities be specified. The Geological Survey will be pleased to work with your agency in properly coordinating all basi'll- data programs required for this project. Very truly yours, _' -r~' /~~ Tr:I: c 11 Region ~resentative ~c: Frank ~ll S. W. Lohman Ed Eckel Carle Dane L.S.Gardner C. L. Forsling (',eMrlll Ate!f CQlIItIIittee APPENDIX G Exhibit No.4 Page 2 ,of 2 ,,"- >;>-,..!-,::. , , '-;".~ .