Laserfiche WebLink
III IIIIIIIIIIIII III <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman Sl., Room 215 <br />Denver, CO 80203 <br />Phone' (3031 B66-3567 <br />FAX: (303) 832-8106 <br />DATE: July 30, 1993 <br />TO: Larry Routten <br />Erica Crosb~yq~ <br />FROM: David Berry°1~ <br />RE: GEC - West Pit Culvert Calculation <br />pF' COQ <br />~~b <br />~~ i <br />O <br />•~t816~ <br />Roy Romer <br />Governor <br />Michael B. Long <br />Division Director <br />As requested, I have completed a proposed design check for the <br />West Pit culvert location. The SEDCAD+ program was used, with <br />the following input: <br />Curve Number = 89 (range, D soil, poor hydrologic <br />condition) <br />Acreage = 11.4 <br />Storm Event = 10 year, 24 hour and 100 year, 24 hour <br />Storm Amount = 2.6 inches and 3.8 inches <br />Culvert Diameter = 30 inches <br />Culvert Slope = 2~ <br />Culvert Length = 48 feet <br />Headwater (total) Available = 3.5 feet <br />During the 10 year, 24 hour storm, SEDCAD predicts a peak flow of <br />17.6 c.f.s. The 30 inch culvert, at a 2~ slope, will pass this <br />event with a total water depth of about 2.4 feet, as predicted by <br />SEDCAD. <br />During the 100 year, 24 hour storm, SEDCAD predicts a peak flow <br />of 28.7 c.f.s., and this will pass through the 30 inch culvert <br />with an approximate total water depth of 3.2 feet. Final <br />construction should occur to leave sufficient headwater <br />allowance. <br />SEDCAD outputs are attached. <br />Attachments <br />STATE OF COLORADO <br />M:\OSS\SCG\SEDCAD.DAB <br />