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SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA RUNOFF(CFS) = 14.28 <br />TOTAL AREA(ACRES) = 2.96 PEAK FLOW RATE(CFS) = 14.28 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 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.) - 6.36 <br />RAINFALL INTENSITY(INCH/HR) - 5.39 <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) = 2.96 <br />TOTAL STREAM AREA(ACRES) = 2.96 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 14.28 <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 6.76 5.42 5.908 0.30( 0.03) 0.10 1.2 200.00 <br />2 14.28 6.36 5.392 0.30( 0.03) 0.10 3.0 210.00 <br />RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO <br />CONFLUENCE FORMULA USED FOR 2 STREAMS. <br />" PEAK FLOW RATE TABLE " <br />STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER <br />NUMBER (CIS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE <br />1 20.11 5.42 5.908 0.30( 0.03) 0.10 3.7 200.00 <br />2 20.45 6.36 5.392 0.30( 0.03) 0.10 4.2 210.00 <br />COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: <br />PEAK FLOW RATE(CFS) - 20.45 Tc(MIN.) - 6.36 <br />EFFECTIVE AREA(ACRES) = 4.18 AREA -AVERAGED Fm(INCH/HR) = 0.03 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 AREA -AVERAGED Ap = 0.10 <br />TOTAL AREA(ACRES) = 4.2 <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 260.00 IS CODE = 91 <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT) ««< <br />ELEVATION DATA: UPSTREAM(FEET) = 141.00 DOWNSTREAM(FEET) = 138.00 <br />FLOW LENGTH(FEET) = 654.00 MANNING'S N = 0.013 <br />ASSUME FULL -FLOWING PIPELINE <br />PIPE -FLOW VELOCITY(FEET/SEC.) - 6.51 <br />PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) <br />GIVEN PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) - 20.45 <br />PIPE TRAVEL TIME(MIN.) = 1.67 Tc(MIN.) = 8.03 <br />LONGEST FLOWPATH FROM NODE 200.00 TO NODE 260.00 = 941.00 FEET. <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 260.00 TO NODE 260.00 IS CODE = 1 <br />»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««< <br />TOTAL NUMBER OF STREAMS = 9 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: <br />TIME OF CONCENTRATION(MIN.) - 8.03 <br />RAINFALL INTENSITY(INCH/HR) = 4.72 <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) = 4.18 <br />TOTAL STREAM AREA(ACRES) = 4.18 <br />3 <br />