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Sedlmentetlon Structures <br />Eeeh sedimentation structure has a design report which evaluates the structure based on <br />the requirements of the regulations and si te-speeific conditions. <br />Diversions and Ditches <br />The peek discharge rate of each diversion end ditch was calculated using SEDCAD analysis <br />and the general hydrology design method previously mentioned. After the discharge rate <br />was determined, a channel section was selected end analyzed by the diversion design <br />routine of SEDCAD or using Dodson and Associates, Inc.'s computer software. The <br />velocity of the channel was compered to the limiting velocity for that type of channel. <br />Culverts <br />The peak discharge rate of each culvert watershed was determined by using the SEDCAD <br />computer program. Addendum 1 contains typical SEDCAD inputs for culverts and ditches. <br />After the discharge rate was calculated, the size of a proposed culvert was determined and <br />analyzed using Dodson end Associates, Int.'s software (Addendum 2). Existing culverts <br />were analyzed and the available headwater was compared to design headwater and adequate <br />freeboard was determined. • <br />Selected References <br />Barfield, B.J., Warner, R.C., and Haan, C.T. 1983. Applied Hydrology and Sedimentology <br />for Disturbed Areas. Oklahoma Technical Press, Stillwater, Oklahoma. <br />Dodson 8 Associates, Inc., Nouston, texas. 1986. "Pipe Culvert end Trepexoidal Channel <br />Analysis". User's Ranuel and Program Reference. <br />HcKOOI, D.K., Brown, L.C., Foster, G.R., Mutchler, C.K., end L.D. Meyer, 1987. "Revised <br />Slope Steepness Factor for the Unive rsel Soil Losa Equation". ASAE - Soil end Yater <br />Division (eooroved for cubl icetion - June, 1987). <br />KOAA Precipitation Frequency Atlas of the Western States. Volume II. Colorado. 1973. <br />Schwab, P.J., end R.C. Verner. 1988. "S EDCAD - Sediment, Erosion, Discharge by Computer <br />Aided Design: User's Manuel". Civil Software Design, Lexington, Kentucky. 240 p. • <br />13-1-f0 Revised 03/01/95 <br />