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PEAK FLOW RATE(CFS) AT CONFLUENCE - 20.45 <br />+ + <br />DA-B1 <br />+ + <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 220.00 TO NODE 221.00 IS CODE = 21 <br />»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />»USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <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.) = 7.027 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.091 <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 />MOBILE HOME PARK B 1.00 0.30 0.250 56 7.03 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.250 <br />SUBAREA RUNOFF(CFS) - 4.51 <br />TOTAL AREA(ACRES) = 1.00 PEAK FLOW RATE(CFS) = 4.51 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 221.00 TO NODE 260.00 IS CODE = 61 <br />»»>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>(STANDARD CURB SECTION USED) ««< <br />UPSTREAM ELEVATION(FEET) = 154.50 DOWNSTREAM ELEVATION(FEET) = 199.30 <br />STREET LENGTH(FEET) = 390.00 CURB HEIGHT(INCHES) = 6.0 <br />STREET HALFWIDTH(FEET) = 16.00 <br />DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 8.00 <br />INSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 1 <br />STREET PARKWAY CROSSFALL(DECIMAL) = 0.020 <br />Manning's FRICTION FACTOR for Streetflow Section(curb-to-curb) - 0.0130 <br />Manning's FRICTION FACTOR for Back -of -Walk Flow Section = 0.0200 <br />"TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 10.71 <br />STREETFLOW MODEL RESULTS USING ESTIMATED FLOW: <br />STREET FLOW DEPTH(FEET) = 0.41 <br />HALFSTREET FLOOD WIDTH(FEET) = 14.09 <br />AVERAGE FLOW VELOCITY(FEET/SEC.) - 5.09 <br />PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 2.08 <br />STREET FLOW TRAVEL TIME(MIN.) = 1.28 Tc(MIN.) = 8.30 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.627 <br />SUBAREA LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN <br />COMMERCIAL B 2.99 0.30 0.100 56 <br />SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.30 <br />SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.100 <br />SUBAREA AREA(ACRES) = 2.99 SUBAREA RUNOFF(CFS) = 12.37 <br />EFFECTIVE AREA(ACRES) = 3.99 AREA -AVERAGED Fm(INCH/HR) = 0.04 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 AREA -AVERAGED Ap = 0.14 <br />TOTAL AREA(ACRES) = 4.0 PEAK FLOW RATE(CFS) = 16.47 <br />END OF SUBAREA STREET FLOW HYDRAULICS: <br />DEPTH(FEET) = 0.45 HALFSTREET FLOOD WIDTH(FEET) = 16.00 <br />FLOW VELOCITY(FEET/SEC.) - 5.50 DEPTH*VELOCITY(FT*FT/SEC.) - 2.46 <br />LONGEST FLOWPATH FROM NODE 220.00 TO NODE 260.00 = 590.00 FEET. <br />El <br />