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For the Bourg "1i.ne, R equals 30 and a value of 0.31 was used <br />for K. Vm was weighted for the tributary area, using values <br />of 0.05 for undisturbed areas and 1.0 for disturbed areas. P. <br />delivery ratio of 0.75, considered conservative, ioas used. <br />Gully erosion was included,. assuming an erosion rate of 0.1 <br />acre-feet per acre of gully area with a sediment delivery <br />ratio of 0.9. Sediment storage was provided in each pond for <br />3 years of average sediment yield. The sedimentation require- <br />ments are summarized below (in acre-feet) and tabiclated on <br />Plate <br />Pond Required <br />I.D. Sediment Volume <br />A 0.7 <br />B 0.7 <br />C 2.8 <br />. H 1.0 <br />Sump D 0.1 <br />ItiTERCEPTOR DITCHES <br />Three interceptor ditches, designated C1, C2 and D and shown <br />on Plate 17 are needed to insure that all runoff from <br />disturbed areas will enter sedimentation facilities. Ditches <br />C1 and C? flow into Pond C and Ditch D flows into Sump D. <br />Peak design rates were determined in accordance with the 1977 <br />SCS publication titled Procedures for Determining Peak Flows <br />in Colorado. The peak discharges resulting from the 10-year <br />precipitation event were used to size the ditches. <br />The area's tributary to the ditches and the disturbed and <br />undisturbed portions utilized to determine the design flaw <br />rates, were based on the worst case land use and ground cover <br />. conditions. The ditches themselves were desifineci in <br />accordance ;:ith a doru~ent entitled Desi~,n Charts for Chen <br />~ 1 .. <br />