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40+00 in CWD-2, the valley sides become quite steep. The final SEDCAD model presented estimates the <br />channel flow resulting in a lesser design storm using the 10 year event and an asymmetrical triangular <br />channel with IH: IV sideslope on the uphill side and a 2H:1 V sideslope on the downhill side. Minimum <br />ditch depth under these conditions would be 2.5 feet. <br />Clean Water Diversions, Typical Channel Design Parameters <br />CWD-1 CWD-2 CWD-3 CWD-4 <br />Design Basis <br />100 year, 24 hour <br />100 year, 24 hour <br />100 year, 24 hour <br />100 year, 24 hour <br />Rainfall amount, in. <br />2.4 <br />2.4 <br />2.4 <br />2.4 <br />Drainage area, ac. <br />144.0 <br />178.0 <br />50.9 <br />129.6 <br />Channel length, ft. <br />6788 <br />6323 <br />4998 <br />5422 <br />Channel sloe <br />1.50% <br />1.50% <br />1.50% <br />1.50% <br />Channel Depth, ft. <br />3.5 <br />3.5 <br />3.5 <br />3.5 <br />Sideslo es <br />3H:1V <br />31JAV <br />3HAV <br />3HAV <br />Peak Flow, cfs <br />19.58 <br />36.13 <br />8.77 <br />19.33 <br />Flow depth, ft. <br />2.10 <br />2.41 <br />1.76 <br />2.10 <br />Velocity, fps <br />3.08 <br />3.96 <br />2.21 <br />3.06 <br />Freeboard, ft. <br />1.40 <br />1.09 <br />1.74 <br />1.4 <br />Exh. 7-23A-2 Revision Date: 7/15/15 <br />Revision No.: PR -04 <br />