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<br />~NJAMI N F. STAPLETON <br />,Chairman. Denver <br />fEDERICK V. KROEGER <br />Vice_Chairmen, Durango <br />~H'N T. BENTON <br />Burns <br />"HN H. BROWNELL <br />~ooper <br />JHN R. FETCH ER <br />Steamboat Springs <br />f M. FURNEAUX <br />Wal den <br />f, 0 <br />)8ERT A. JACKS N <br />;Pueblo <br /> <br />"t. <br /> <br />........, <br />) <br /> <br />FELIX L. SPARKS <br />Director <br /> <br />~- <br />.~~ <br />.;.........,.,,::. <br />" ..,'~.. <br />'" ~ <br /> <br />lAREN D. MORRLLL <br />Deputy Oi rector <br /> <br />RtCHARD D. LAMM <br />Governor <br /> <br />OEPARTMENT OF NATURAL RESOURCES <br />COLORADO WATER CONSERVATION BOARD <br /> <br />\-VID LE1NSOQRF <br />~Cre5ted Butte <br /> <br />823 STATE CENTENNIAL BUILDING <br />1313 SHERMAN STREET <br />DENVER. COLORADO 80203 <br /> <br />TELEPHONE <br />13031 892.3441 <br /> <br />~RaERT H. VANDE~.tQER <br />:\Sterling <br /> <br />, June 6, 1977 <br /> <br />Mr. Thomas J. Stone <br />Gingery Associates, Inc. <br />2840 South Vallejo Street <br />Englewood, Colorado 80110 <br /> <br />Dear Mr. Stone: <br /> <br />The Colorado Water Conservation Board has made a cursory <br />review of the Ashcroft Draw hydrology report and our comments' are <br />as follows: <br /> <br />The study is based on 6-hour precipitation data and the <br />tabular discharge values in SCS-TR 55. <br /> <br />The SCS method is based on 24 hour values and a type II rainfall <br />distribution,which is applicable only to western Colorado west of <br />the 8,000 foot elevation of the South Platte and Arkansas River Basins. <br /> <br />The procedure is therefore not valid for the Ashcroft Draw <br />study area, and we recommend that the discharge values should be <br />revised. <br /> <br />The routing procedure and the other supporting data was not <br />reviewed. <br /> <br />Please contact me if you have any questions about our comments. <br /> <br />SinCerely.~ <br />c4. <br /> <br />E. I. JEN OK, P.E. <br />Supv. Water Resource <br />Engineer <br /> <br />EIJ:ajt <br />cc: Wayne Graham <br />Roy Joist <br /> <br />