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SEDCAD+ ERODIBLE CHANNEL DESIGN <br />------------------------------- <br />i~ Circumvential Ditch D-3 <br />Limiting Velocity Technique <br />Sediment-laden Water <br />INPUT VALUES: <br />Shape TRIANGULAR <br />Discharge 0.10 cfs * <br />Slope 9.00 $ <br />Sideslopes 2.00:1 (L) 2.00:1 (R) <br />Manning's n 0.030 <br />Max. Velocity 5.50 fps <br />Material GRADED SILTS - COBBLES COLLOIDAL <br />Freeboard .3 ft <br />RESULTS: <br />Actual Discharge 0.10 cfs* <br />Depth 0.15 ft <br />with Freeboard 0.45 ft <br />Top Width 0.59 ft <br />with Freeboard 1.79 ft -- <br />Velocity 2.42 fps <br />C: Cross Sectional Area 0.04 sq ft <br />Hydraulic Radius 0.07 ft <br />Froude Number 1.58 <br />* The actual discharge in Ditch D-3 is expected to be 0.09 cfs fora 10-year, 24-hour <br />storm event (see Enclosure 7). A hypothetical flow of 0.10 cfs was entered as the <br />Input Discharge as the minimum value accepted by the SEDCAD+ ditch design <br />model, providing an apparent Actual Discharge of 0.10 cfs. <br />~~ <br />Enclosure 9 <br />