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MEA100.RE5 <br />RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO <br />CONFLUENCE FORMULA USED FOR 2 STREAMS. <br />** PEAK FLOW RATE TABLE ** <br />STREAM <br />Q <br />Tc <br />Intensity <br />Fp(Fm) Ap <br />Ae HEADWATER <br />NUMBER <br />(CFS) <br />(MIN.) <br />(INCH/HR) <br />(INCH/HR) <br />(ACRES) NODE <br />1 <br />65.45 <br />7.28 <br />4.988 <br />0.30( 0.03) 0.10 <br />14.3 120.00 <br />2 <br />65.20 <br />8.57 <br />4.545 <br />0.30( 0.03) 0.10 <br />15.6 110.00 <br />COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: <br />PEAK FLOW RATE(CFS) = 65.45 Tc(MIN.) = 7.28 <br />EFFECTIVE AREA(ACRES) = 14.30 AREA -AVERAGED Fm(INCH/HR) = 0.03 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 AREA -AVERAGED Ap = 0.10 <br />TOTAL AREA(ACRES) = 15.6 <br />LONGEST FLOWPATH FROM NODE 110.00 TO NODE 150.00 = 1924.00 FEET. <br />FLOW PROCESS FROM NODE 150.00 TO NODE 160.00 IS CODE = 41 <br />>>>>>COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA<<<<< <br />>>>>>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT)<<<<< <br />---------------------------------------------------------------------------- <br />----------------------------------------- <br />ELEVATION DATA: UPSTREAM(FEET) = 138.90 DOWNSTREAM(FEET) = 137.20 <br />FLOW LENGTH(FEET) = 101.00 MANNING'S N = 0.013 <br />ASSUME FULL -FLOWING PIPELINE <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 13.33 <br />PIPE FLOW VELOCITY = (TOTAL FLOW)/(PIPE CROSS SECTION AREA) <br />GIVEN PIPE DIAMETER(INCH) = 30.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 65.45 <br />PIPE TRAVEL TIME(MIN.) = 0.13 Tc(MIN.) = 7.41 <br />LONGEST FLOWPATH FROM NODE 110.00 TO NODE 160.00 = 2025.00 FEET. <br />**************************************************************************** <br />FLOW PROCESS FROM NODE 160.00 TO NODE 160.00 IS CODE = 1 <br />---------------------------------------------------------------------------- <br />>>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE« <<< <br />---------------------------------------------------------------------------- <br />TOTAL NUMBER OF STREAMS = 2 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: <br />TIME OF CONCENTRATION(MIN.) = 7.41 <br />RAINFALL INTENSITY(INCH/HR) = 4.94 <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) = 14.30 <br />TOTAL STREAM AREA(ACRES) = 15.65 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 65.45 <br />Page 11 <br />