Laserfiche WebLink
»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />»USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />INITIAL SUBAREA FLOW-LENGTH(FEET) = 190.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 154.50 DOWNSTREAM(FEET) = <br />151.90 <br />Tc - K*[(LENGTH" 3.00)/(ELEVATION CHANGE)]"0.20 <br />SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.850 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) - 5.655 <br />SUBAREA Tc AND LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap <br />SCS Tc <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) <br />CN (MIN.) <br />COMMERCIAL B 0.78 0.30 0.100 <br />56 5.85 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA RUNOFF(CFS) - 3.95 <br />TOTAL AREA(ACRES) - 0.78 PEAK FLOW RATE(CFS) - 3.95 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 201.00 TO NODE 210.00 IS CODE = <br />91 <br />»»>COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>USING USER -SPECIFIED PIPESIZE (EXISTING ELEMENT) ««< <br />---------------------------------------------------------------------------- <br />ELEVATION DATA: UPSTREAM(FEET) = 146.50 DOWNSTREAM(FEET) = <br />141.50 <br />FLOW LENGTH(FEET) = 361.00 MANNING'S N = 0.013 <br />DEPTH OF FLOW IN 12.0 INCH PIPE IS 9.5 INCHES <br />PIPE -FLOW VELOCITY(FEET/SEC.) - 5.92 <br />GIVEN PIPE DIAMETER(INCH) = 12.00 NUMBER OF PIPES = 1 <br />PIPE-FLOW(CFS) - 3.95 <br />PIPE TRAVEL TIME(MIN.) = 1.02 Tc(MIN.) = 6.87 <br />LONGEST FLOWPATH FROM NODE 200.00 TO NODE 210.00 = 551.00 FEET. <br />+ <br />+ <br />EX-B3 <br />---------------------------------------------------------------------------- <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 210.00 TO NODE 210.00 IS CODE = <br />82 <br />»»>ADD SUBAREA RUNOFF TO MAINLINE, AT MAINLINE Tc, ««< <br />»»>(AND COMPUTE INITIAL SUBAREA RUNOFF) ««< <br />---------------------------------------------------------------------------- <br />INITIAL SUBAREA FLOW-LENGTH(FEET) = 100.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 153.50 DOWNSTREAM(FEET) = <br />152.50 <br />Tc - K*[(LENGTH" 3.00)/(ELEVATION CHANGE)]"0.20 <br />SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.000 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 6.187 <br />SUBAREA Tc AND LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap <br />SCS Tc <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) <br />CN (MIN.) <br />COMMERCIAL B 1.10 0.30 0.100 <br />56 5.00 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA AREA(ACRES) = 1.10 INITIAL SUBAREA RUNOFF(CFS) = <br />6.10 <br />" ADD SUBAREA RUNOFF TO MAINLINE AT MAINLINE Tc: <br />MAINLINE Tc(MIN.) = 6.87 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.159 <br />SUBAREA AREA(ACRES) = 1.10 SUBAREA RUNOFF(CFS) = 5.08 <br />EFFECTIVE AREA(ACRES) = 1.88 AREA -AVERAGED Fm(INCH/HR) <br />= 0.03 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 AREA -AVERAGED Ap = 0.10 <br />TOTAL AREA(ACRES) = 1.9 PEAK FLOW RATE(CFS) = <br />8.68 <br />+ <br />+ <br />EX-B2 <br />+------------------------------------------ <br />------------------------------+ <br />Z <br />