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<br />I ~ <br />~fI <br /> <br />~!5 <br />,~ J, <br />e~ <br /> <br />1.;-' <br />co <br /> <br />::~ '._-' <br />~~I (:;, <br /> <br />'-' <br />o-j <br /> <br />c<'i <br /> <br />,:'":.-' <br /> <br />.:~ <br /> <br />.,",' <br /> <br />" <br />.... <br /> <br />" <br /> <br />i:j <br />" <br /> <br />i Xi <br />u <br />~J <br /> <br />11 <br /> <br />VI STATISTICAL DATA AND GENERAL INFORMATION <br />-- <br /> <br />To assure that this report will be of value if the design work <br /> <br />is not done by the firm doing the preliminary engineering study, the <br /> <br />information necessary to assure satisfactory design of the diversion <br /> <br />structure is given below. <br /> <br />1. Owners have requested that Cerro Canal have a capacity of 200 <br /> <br />cfs after concrete lining. As s = 0.0015, a section with six <br /> <br />foot' bottom, 1!,:1 side slopes, and 3'2 feet deep will suffice. <br /> <br />Adjustments in cross sectional dimensions can be made, if nec- <br /> <br />essary. Pink Willson Company, Greeley, Colorado was contacted <br /> <br />for cost estimating purposes. <br /> <br />2. The maximum recorded instantaneous flow in Costilla Creek is <br /> <br />1150 cfs, which occurred May 11, 1942 according to U.S.G.S. <br /> <br />records. <br /> <br />3. Original cost estimates by S.C.S. were $80,000 for diversion <br /> <br />structure; $30,000 for canal lining. <br /> <br />4. A small equalization pond above the diversion structure would <br /> <br />be beneficial from the standpoint of equalizing diurnal fluc- <br /> <br />tuations and modifying fluctuations in flows caused by normal <br /> <br />summer rains and snowmelt. It also would act as a sediment <br /> <br />basin. <br />