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»»>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.) = 5.000 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.187 <br />SUBAREA Tc AND LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) <br />COMMERCIAL B 1.22 0.30 0.100 56 5.00 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA RUNOFF(CFS) = 6.76 <br />TOTAL AREA(ACRES) = 1.22 PEAK FLOW RATE(CFS) = 6.76 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 201.00 TO NODE 210.00 IS CODE = 91 <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT) ««< <br />---------------------------------------------------------------------------- <br />ELEVATION DATA: UPSTREAM(FEET) = 199.00 DOWNSTREAM(FEET) = 141.00 <br />FLOW LENGTH(FEET) = 187.00 MANNING'S N = 0.013 <br />DEPTH OF FLOW IN 18.0 INCH PIPE IS 9.2 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 7.42 <br />GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 6.76 <br />PIPE TRAVEL TIME(MIN.) = 0.42 Tc(MIN.) = 5.42 <br />LONGEST FLOWPATH FROM NODE 200.00 TO NODE 210.00 = 287.00 FEET. <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 IS CODE = 1 <br />»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««< <br />TOTAL NUMBER OF STREAMS = 2 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: <br />TIME OF CONCENTRATION(MIN.) - 5.42 <br />RAINFALL INTENSITY(INCH/HR) = 5.91 <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) = 1.22 <br />TOTAL STREAM AREA(ACRES) = 1.22 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 6.76 <br />+ + <br />DA-B2 <br />---------------------------------------------------------------------------- <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 IS CODE = 21 <br />»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />»USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />INITIAL SUBAREA FLOW-LENGTH(FEET) = 200.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 157.00 DOWNSTREAM(FEET) = 155.00 <br />Tc - K*[(LENGTH" 3.00)/(ELEVATION CHANGE)]"0.20 <br />SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.357 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.392 <br />SUBAREA Tc AND LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) <br />COMMERCIAL B 2.96 0.30 0.100 56 6.36 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />2 <br />