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<br /> <br /> <br /> <br /> DITCH DESIGN SPREADSHEET <br /> USING MANNINGS EQUATION <br />FOR TRAPEZOIDAL OR V-SHAPED DITCHES <br />DATE: 01-Feb-89 <br /> GENERAL INFORMATION <br />f PROJECT OR BILLING N0. SAN LUIS 14702 <br /> FEATURE RIVER-HAU L ROAD CROSSING <br /> DESIGN EVENT: RETURN PERIOD AND DURATION <br />FREEBOARD REQUIREMENT (FT) 100 <br />1.0 YR 24 HR <br /> SIZING CRITERIA (INPUT) <br />I DESIGN FLOW (CFS) 3,000.0 INTERIM CALCS <br /> TRIAL WIDTH (CHANNEL BOTTOM,FT) 240.0 <br /> TRIAL FLOW DEPTH (FT) 3.0 AREA 810.00 SQ FT <br />' CHANNEL SIDE SLOPE (H:1), H= 10.0 WET PERM 300.30 FT <br /> CHANNEL LONGITUDINAL SLOPE (Y) 0.3 HYD RAD]US 2.70 FT <br /> MANNINGS "n" VALUE 0.030 <br />' <br /> CALCULATIONS (OUTPUT} <br /> COMMENT <br /> FLOW CAPACITY (CFS) 3,897.7 OK <br />' MEAN FLOW VELOCITY (FPS) 4.8 <br /> FREE SURFACE WIDTH (TOP WIDTH, FT) 300.0 <br />' TOTAL DEPTH OF CHANNEL (FT) <br />FROUDE NUMBER 4.0 <br />0 <br />5 <br /> . <br />RIPRAP REQUIREMENT <br />d50 OF REQUIRED RIPRAP (IN) 0.9 <br />*NOTE: ASSUMED SPECIFIC GRAVITY OF ROCK <br />USED FOR RIPRAP = 2.65 <br /> <br /> <br />