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MPB2.OUT <br />ELEVATION DATA: UPSTREAM(FEET) = 144.00 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 5.3 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) = 5.64 <br />GIVEN PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) = 2.45 <br />PIPE TRAVEL TIME(MIN.) = 0.55 Tc(MIN.) = 5.55 <br />LONGEST FLOWPATH FROM NODE 200.00 TO NODE 210.00 = 287.00 FEET. <br />**************************************************************************** <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 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.) = 5.55 <br />RAINFALL INTENSITY(INCH/HR) = 2.13 <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) = 1.22 <br />TOTAL STREAM AREA(ACRES) = 1.22 <br />PEAK FLOW RATE(CFS) AT CONFLUENCE = 2.45 <br />+ + <br />DA-B2 <br />+ + <br />**************************************************************************** <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 IS CODE = 21 <br />---------------------------------------------------------------------------- <br />>>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< <br />>>USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />---------------------------------------------------------------------------- <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 />* 2 YEAR RAINFALL INTENSITY(INCH/HR) = 1.972 <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 />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />Page 3 <br />