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AREA -AVERAGED Ap = 0.10 <br />EFFECTIVE STREAM AREA(ACRES) - 6.43 <br />TOTAL STREAM AREA(ACRES) = 6.43 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE - 31.71 <br />+ + <br />DA-C9 <br />+ + <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 330.00 TO NODE 331.00 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 2.52 0.30 0.100 56 6.36 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA RUNOFF(CFS) = 12.16 <br />TOTAL AREA(ACRES) = 2.52 PEAK FLOW RATE(CFS) = 12.16 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 331.00 TO NODE 340.00 IS CODE = 91 <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT) ««< <br />ELEVATION DATA: UPSTREAM(FEET) = 150.00 DOWNSTREAM(FEET) = 145.30 <br />FLOW LENGTH(FEET) = 298.00 MANNING'S N = 0.013 <br />DEPTH OF FLOW IN 24.0 INCH PIPE IS 11.1 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) - 8.53 <br />GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 12.16 <br />PIPE TRAVEL TIME(MIN.) = 0.58 Tc(MIN.) = 6.94 <br />LONGEST FLOWPATH FROM NODE 330.00 TO NODE 340.00 = 498.00 FEET. <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 340.00 TO NODE 340.00 IS CODE = 1 <br />»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««< <br />»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««< <br />TOTAL NUMBER OF STREAMS = 2 <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) - 2.52 <br />TOTAL STREAM AREA(ACRES) = 2.52 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 12.16 <br />" CONFLUENCE DATA " <br />STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER <br />NUMBER (CIS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE <br />1 31.71 6.41 5.365 0.30( 0.03) 0.10 6.4 300.00 <br />2 12.16 6.94 5.128 0.30( 0.03) 0.10 2.5 330.00 <br />RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO <br />CONFLUENCE FORMULA USED FOR 2 STREAMS. <br />El <br />