Laserfiche WebLink
Sedimentation Structures • <br />Each sedimentation structure has a design report which evaluates the structure based on <br />the requirements of the regulations and site-specific conditions. <br />Diversions and Ditches <br />The peak discharge rate of each diversion and 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 and analyzed by the diversion design <br />routine of SEDCAD , or using Dodson and Associates, Inc.'s computer sof tvra re. The <br />velocity of the channel was compared 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 2 contains typical SEDCAD inputs for culverts and ditches. <br />After the discharge rate was calculated, the size of a proposed culvert was d etermined and <br />analyzed using Dodson and Associates, Ines software (Addendum 3). Existing culverts were <br />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 d Associates, Inc., Houston, Texas. 1986. "Pipe Culvert and Trapezoidal Channel <br />Analysis". User's Manual and Program Reference. <br />McKool, D.N., Brown, L.C., Foster, G.R., Mutchler, C.K., and L.D. Meyer. 1987. "Revised <br />Slope Steepness Factor for the Universal Soil Loss Equation". ASAE - Soil and Water <br />Division (aooroved for oublica tion - June. 1987). <br />NOAA Precipitation Frequency Atlas of the Western States. Volume II. Colorado. 1973. <br />Schwab, P.J., and R.C. Warner. 1988. "SEDCAD - Sediment, Erosion, Discharge by Computer <br />Aided Design: User's Manual". Civil Software Design, Lexington, Kentucky. 240 p. • <br />13-1-10 <br />