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TOTAL NUMBER OF STREAMS = 4 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE: <br />TIME OF CONCENTRATION(MIN.) = 8.30 <br />RAINFALL INTENSITY(INCH/HR) = 4.63 <br />AREA -AVERAGED Fm(INCH/HR) = 0.03 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 <br />AREA -AVERAGED Ap = 0.10 <br />EFFECTIVE STREAM AREA(ACRES) = 0.56 <br />TOTAL STREAM AREA(ACRES) = 0.56 <br />PEAK FLOW OATE(CFS) AT CONFLUENCE = 2.32 <br />+ + <br />OF-D2 <br />+ + <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 430.00 TO NODE 431.00 IS CODE = 21 <br />---------------------------------------------------------------------------- <br />»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />>>USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />INITIAL SUBAREA FLOW-LENGTH(FEET) = 22.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 147.20 DOWNSTREAM(FEET) = 146.60 <br />To = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 <br />SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = <br />5.000 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) <br />= <br />6.187 <br />SUBAREA To AND LOSS RATE <br />DATA(AMC II): <br />DEVELOPMENT TYPE/ <br />SCS SOIL AREA <br />Fp <br />Ap SCS <br />To <br />LAND USE <br />GROUP (ACRES) <br />(INCH/HR) <br />(DECIMAL) CN <br />(MIN.) <br />COMMERCIAL <br />B 0.05 <br />0.30 <br />0.100 56 <br />5.00 <br />SUBAREA AVERAGE PERVIOUS <br />LOSS RATE, Fp(INCH/HR) <br />= 0.30 <br />SUBAREA AVERAGE PERVIOUS <br />AREA FRACTION, Ap <br />= 0.100 <br />SUBAREA RUNOFF(CFS) = <br />0.28 <br />TOTAL AREA(ACRES) = <br />0.05 PEAK FLOW <br />RATE(CFS) <br />= 0.28 <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 431.00 TO NODE 440.00 IS CODE = 61 <br />---------------------------------------------------------------------------- <br />»»>COMPUTE STREET FLOW TRAVEL TIME THOU SUBAREA««< <br />»»>(STANDARD CURB SECTION USED) ««< <br />UPSTREAM ELEVATION(FEET) = 146.60 DOWNSTREAM ELEVATION(FEET) = 144.70 <br />STREET LENGTH(FEET) = 590.00 CURB HEIGHT(INCHES) = 6.0 <br />STREET HALFWIDTH(FEET) = 22.00 <br />DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 11.00 <br />INSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 2 <br />STREET PARKWAY CROSSFALL(DECIMAL) = 0.020 <br />Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) = 0.0130 <br />Manning's FRICTION FACTOR for Back -of -Walk Flow Section = 0.0200 <br />**TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 1.46 <br />STREETFLOW MODEL RESULTS USING ESTIMATED FLOW: <br />STREET FLOW DEPTH(FEET) = 0.26 <br />HALFSTREET FLOOD WIDTH(FEET) = 6.88 <br />AVERAGE FLOW VELOCITY(FEET/SEC.) = 1.24 <br />PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 0.33 <br />STREET FLOW TRAVEL TIME(MIN.) = 7.95 Tc(MIN.) = 12.95 <br />