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<br />// <br /><" <br /> <br />. <br /> <br />~)TATE OF CDLOFvAJ)C= <br /> <br />o <br /> <br />COLORADO WATER CONSERVATION BOARD <br />Department of Natural Resources <br />721 StatE! Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Phone: D03} 86&.)441 <br /> <br />June 6, 1990 <br /> <br />Roy Romer <br />GovernOI <br />J Wilham McDoo<lld <br />Oireclof <br />David W. Walker <br />Deputy OIl! etor <br /> <br />Ms. Sheila Beissel. Project Engineer <br />Wright Water Engineers, Inc. <br />2490 West 26th Avenue. SlJ.ite lOOA <br />Denver. CO ~0F:IT-0. / <br /> <br />Dear Ms. Be~~ <br /> <br />I am writing you regarding the Letter of Map Revision <br />(LOMR) request for BattlE~ment Mesa in unincol:porated Garfield <br />County. In your April 21, 1990 letter to us you requested <br />comments regarding the PI:oposHd hydrology fOI: the LOMR. I will <br />provide such comments as well as commenting on the stream <br />reaches we think should ultimately be included in the LOMR <br />. packet. <br /> <br />HY!lroloq'~: <br /> <br />" <br />~ <br /> <br />It is clear that a considlHable effoJ:t was expended in <br />computing flows for the l~OMR. Our comments, therefore. are not <br />intended to criticize the work. but to raise questions about <br />basic assumptions. If the 50 percent impermeable area <br />assumptions are appropriate for the land within the Battlement <br />Mesa P.U.D.. then the fl,)wS a:re reasonable. If t,he development <br />pattern were more like t:rpical land developm.ent in that part of <br />Garfield County. most of the flows calculated by Wright Water <br />Engineers would b~quite high when compared to the other flows <br />in the area. <br /> <br />. <br /> <br />As a basis of comparison, we are enClosing a copy of the <br />discharge-frequency-drainage area J:elationships developed by <br />the U.S.D.A. Soil Conservatie,n Service for Colorado River <br />tributaries between Glen~ood Springs and De Beque. For basins <br />like your Basin E (approximat_ely 3 square miles) OJ: your Basin <br />EI or Basin EIb (approximately 2 sqlJare miles) your flows are <br />on the order of 2,300 c.f.s. and 1,200-1.400 c.f.s. <br />respectively. The S.C.S. table shows flows of 550 c.f.s. and <br />425 c.f.s. respectively for basins af those sizes. It should <br />be noted that the S. C. S. land-use a.ssumptions do not consider <br />50 percent impermable area. They presume a far more rural <br />land-use pattern. <br /> <br />2623E* <br />