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TOTAL STREAM AREA(ACRES) = 11.89 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 48.28 <br />+ + <br />DA-A7 <br />+ + <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 120.00 TO NODE 121.00 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) = 156.50 DOWNSTREAM(FEET) = 154.50 <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 1.98 <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 />10.97 <br />TOTAL AREA(ACRES) = <br />1.98 PEAK FLOW <br />RATE(CFS) <br />= 10.97 <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 121.00 TO NODE 122.00 IS CODE = 41 <br />---------------------------------------------------------------------------- <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THOU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT)««< <br />ELEVATION DATA: UPSTREAM(FEET) = 147.30 DOWNSTREAM(FEET) = 147.00 <br />FLOW LENGTH(FEET) = 34.00 MANNING'S N = 0.013 <br />ASSUME FULL -FLOWING PIPELINE <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 13.97 <br />PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) <br />GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 10.97 <br />PIPE TRAVEL TIME(MIN.) = 0.04 Tc(MIN.) = 5.04 <br />LONGEST FLOWPATH FROM NODE 120.00 TO NODE 122.00 = 134.00 FEET. <br />++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ <br />FLOW PROCESS FROM NODE 122.00 TO NODE 130.00 IS CODE = 41 <br />---------------------------------------------------------------------------- <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THOU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT)««< <br />ELEVATION DATA: UPSTREAM(FEET) = 147.00 DOWNSTREAM(FEET) = 145.20 <br />FLOW LENGTH(FEET) = 120.00 MANNING'S N = 0.013 <br />DEPTH OF FLOW IN 18.0 INCH PIPE IS 13.0 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 8.00 <br />GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 10.97 <br />PIPE TRAVEL TIME(MIN.) = 0.25 Tc(MIN.) = 5.29 <br />LONGEST FLOWPATH FROM NODE 120.00 TO NODE 130.00 = 254.00 FEET. <br />+ + <br />DA-A8 <br />