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FLOW PROCESS FROM NODE 410.00 TO NODE 411.00 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) = 100.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 156.00 DOWNSTREAM(FEET) = 154.00 <br />Tc = 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 Tc AND LOSS RATE <br />DATA(AMC II): <br />DEVELOPMENT TYPE/ <br />SCS SOIL AREA <br />Fp <br />Ap SCS <br />Tc <br />LAND USE <br />GROUP (ACRES) <br />(INCH/HR) <br />(DECIMAL) CN <br />(MIN.) <br />COMMERCIAL <br />B 2.12 <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 />11.75 <br />TOTAL AREA(ACRES) = <br />2.12 PEAK FLOW <br />RATE(CFS) <br />= 11.75 <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 411.00 TO NODE 440.00 IS CODE = 31 <br />---------------------------------------------------------------------------- <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THOU SUBAREA««< <br />»»>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW) ««< <br />ELEVATION DATA: UPSTREAM(FEET) = 146.70 DOWNSTREAM(FEET) = 135.80 <br />FLOW LENGTH(FEET) = 891.00 MANNING'S N = 0.013 <br />DEPTH OF FLOW IN 21.0 INCH PIPE IS 12.8 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 7.66 <br />ESTIMATED PIPE DIAMETER(INCH) = 21.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 11.75 <br />PIPE TRAVEL TIME(MIN.) = 1.94 Tc(MIN.) = 6.94 <br />LONGEST FLOWPATH FROM NODE 410.00 TO NODE 440.00 = 991.00 FEET. <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 440.00 TO NODE 440.00 IS CODE = 1 <br />---------------------------------------------------------------------------- <br />»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««< <br />TOTAL NUMBER OF STREAMS = 4 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: <br />TIME OF CONCENTRATION(MIN.) = 6.94 <br />RAINFALL INTENSITY(INCH/HR) = 5.13 <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) = 2.12 <br />TOTAL STREAM AREA(ACRES) = 2.12 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 11.75 <br />+ + <br />OF-Dl <br />+ + <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 420.00 TO NODE 421.00 IS CODE = 21 <br />---------------------------------------------------------------------------- <br />»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />>>USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />