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i~ <br />~~ <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />DITCH DESIGN SPREADSHEET <br />It~ING MPNNINGS E9UATION <br />FOR TRAPEZOIDAL OR V-SHAPED DITCHES DATE: O1-Feir E? <br />GENERAL INFORMATION <br />PROJECT OR BILLING N0. SAN LUIS 14702 <br />FEATURE INTERCEPTOR DITCH 2 <br />DESIGN EVENT: RETURN PERIOD AND DUP,ATION 100 YR 24 HR <br />FREEBOARD REQUIREMENT (FT) 1.0 <br />SIZING CRITERIA (INPUT) <br />DESIGN FLOW (CPS) 228.0 INTERIM CPLCS <br />TRIAL WIDTH (CIiANNEL BOTTOM,FT) 10.0 <br />TRIAL FLOW DEPTI' (FT) 1.8 AREA 22.09 SQ FT <br />CHANNEL SIDE SLOPE (H:1), H= 1.5 WET PERIM 16.31 FT <br />CHANNEL LONGITLAINAL SLOPE (e) 3.0 HYD RADIUS 1.35 FT <br />Mr~NNINGS "n'~ VALUE 0.030 <br />CALCULATIONS (WTPUT) <br />COMMENT <br />FLOW CAPACITY (CFSI 230.7 OK <br />MEAN FLOW VELOCITY (FPS) 10.4 <br />FREE SURFACE WIDTH (TOP WIDTH, FTl 15.3 <br />TOTAL DEPTH OF CHANNEL ~'FT) 2.8 <br />FROUDE NUMBER 1.5 **SUPERCRITICAL FLOW!** <br />RIPRAP REQUIREMENT <br />d50 OF REQUIRED RIPRAP (IN) x*SUPERCRITICAL FLGW!** <br />*NOTE: ASSUMED SPECIFIC GRAVITY OF ROCK <br />USED FOR RIPRAP = 2.65 <br />