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i~ <br /> <br />~~ <br /> <br /> <br /> DITCH DESIGN SPREADSHEET <br /> USING MANNINGS EQUATION <br />' FOR TRAPEZOIDAL OR V-SHAPED DITCHES DATE: O1-Feb-89 <br /> GENERAL INFORMATION <br /> PROJECT OR BILLING NO. SAN LUIS 14702 <br /> FEATURE WRDF Af6 HAUL ROAD SWALE <br /> DESIGN EVENT: RETURN PERIOD AND DURATION 100 YR 24 HR <br />1 FREEBOARD REQUIREMENT (FT) 1.0 <br /> SIZING CRITERIA (INPUT) <br /> DESIGN FLOW (CFS) 215.0 INTERIM CALCS <br /> TRIAL WIDTH (CHANNEL BOTTOM,FT) 70.0 <br /> TRIAL FLOW DEPTH (FT) 1.1 AREA 89.10 SQ FT <br /> CHANNEL SIDE SLOPE (H:1), H= 10.0 WET PERIM 92.11 FT <br /> CHANNEL LONGITUDINAL SLOPE (%) 0.3 HYD RADIUS 0.97 FT <br /> MANNINGS "n" VALUE 0.030 <br /> CALCULATIONS (OUTPUT) <br /> COMMENT <br /> FLOW CAPACITY (CFS) 216.4 OK <br /> MEAN FLOW VELOCITY (FPS) 2.4 <br /> FREE SURFACE WIDTH (TOP WIDTH, FT) 92.0 <br /> TOTAL DEPTH OF CHANNEL (FT) 2.1 <br /> FROUDE NUMBER 0.4 <br />' RIPRAP REQUIREMENT <br /> d50 OF REQUIRED RIPRAP (IN) NO RIPRAP REQUIRED <br />*NOTE: ASSUMED SPECIFIC GRAVITY OF ROCK <br />USED FOR RIPRAP = 2.65 <br /> <br />1 <br />