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EFFECTIVE STREAM AREA(ACRES) = 45.44 •TOTAL STREAM AREA(ACRES) = 45.44 PEAK FLOW RATE(CFS) AT CONFLUENCE = 90.75 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** Q(CFS) Tc(MIN. ) Fm(INCH/HR) Ae(ACRES) 1 273.26 28.05 .050 156.30 2 278.34 25.32 .050 145.51 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 278.34 Tc(MIN. ) = 25.317 EFFECTIVE AREA(ACRES) = 145.51 AVERAGED Fm(INCH/HR) _ .05 TOTAL AREA(ACRES) = 156.30 **************************************************************************** FLOW PROCESS FROM NODE 3.00 TO NODE 3.01 IS CODE = 2 ---------------------------------------------------------------------------- »»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< NATURAL AVERAGE COVER TC = K* [ (LENGTH** 3.00) /(ELEVATION CHANGE) )** .20 INITIAL SUBAREA FLOW-LENGTH(FEET) = 350.00 UPSTREAM ELEVATION(FEET) = 120.00 DOWNSTREAM ELEVATION(FEET) = 110.00 ELEVATION DIFFERENCE(FEET) = 10.00 TC(MIN. ) _ .706* [ ( 350.00** 3.00) /( 10.00) )** .20 = 14.971 ®1000 YEAR RAINFALL INTENSITY(INCH/HR) = 2.805 *USER SPECIFIED(SUBAREA) : NATURAL OR AGRICULTURE SUBAREA LOSS RATE, Fm(INCH/HR) _ .0100 SUBAREA RUNOFF(CFS) = 7.12 TOTAL AREA(ACRES) = 2.83 PEAK FLOW RATE(CFS) = 7.12 **************************************************************************** FLOW PROCESS FROM NODE 3.01 TO NODE 3.02 IS CODE = 3 ---------------------------------------------------------------------------- »»>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA««< »»>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)««< ESTIMATED PIPE DIAMETER(INCH) INCREASED TO 18.000 DEPTH OF FLOW IN 18.0 INCH PIPE IS 4.6 INCHES PIPE-FLOW VELOCITY(FEET/SEC. ) = 20.2 UPSTREAM NODE ELEVATION(FEET) = 110.00 DOWNSTREAM NODE ELEVATION(FEET) = 38.00 FLOW LENGTH(FEET) = 280.00 MANNING°S N = 013 ESTIMATED PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 7.12 TRAVEL TIME(MIN. ) _ .23 TC(MIN. ) = 15.20 **************************************************************************** FLOW PROCESS FROM NODE 3.01 TO NODE 3.02 IS CODE = 8 ---------------------------------------------------------------------------- »»>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW««< 1000 YEAR RAINFALL INTENSITY(INCH/HR) = 2.787 *USER SPECIFIED(SUBAREA) :