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1 <br />1 <br />1 <br />DITCFI [YcSIGN CPREADSHEFT <br />IF;ING MPIJIJINGS EQUATION <br />FOR 1RAF'EZDIDAL OR V-SHAPED DITCHES DATE: 01-Feh-89 <br />GENEF;A[ INFORMATION <br />PROJECT OR BILLIN(: N0. SAN LUIS 14702 <br />FEATURE INTERCEPTOR DITCH 1 <br />DESIGN EVENT: RETURN PERIOD AND DURATION 100 YR 24 HR <br />FP,EEBOARD RE9UIREMENT (FT) 1.0 <br />SIZING CRITERIA (INPUT) <br />DESIGN FLOW (CF5) 12.4 INTERIM CAI_CS <br />TRIAL WIDTH (CkiANNEL BOTTOM,FT) 5.0 <br />TRIAL FLOW pEPTH (FT) O.5 AREA 2.94 ~ FT <br />CHANNEL SIDE SLOPE (H:1). H= 1.5 WET PERM 6.84 FT <br />CHANNEL LONGITUDINAL SLOPE (°~1 2.3 HYD RADIUS 0.43 Fl" <br />MANNINGS "n" VALUE 0.030 <br />GaLCULATIONS (OUTPUT) <br />COMMENT <br />FLOW CAPACITY (CAS) 12.5 OK <br />MEAN FLOW VELOCITY (FPS) 4.2 <br />FREE SURFACE WIDTH (TOP WIDTH, FT) 6.5 <br />TDTAL DEPTH OF CHANNEL (FT) 1.5 <br />FROUDE NUMBER 1.1 **SUPERCRITICAL FLC~4J!~~ <br />RIPRAP REd.!IREMENT <br />d50 OF RE9lJIREU R(f'RPP ( IN ) **~XJPERCRITICAf_ FLOW! +'* <br />WNOTE: A ticY1MED SPECIFIC GRAVITY OF ROCK <br />U~D FOR RTPRAP = 2.65 <br />