Laserfiche WebLink
............................................................................ <br />FLOW PROCESS FROM NODE 360.00 TO NODE 361.00 IS CODE = 21 <br />»»>RATIONAL METHOD INITIAL SUBAREA ANALYSIS««< <br />»USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />INITIAL SUBAREA FLOW-LENGTH(FEET) = 22.00 <br />ELEVATION DATA: UPSTREAM(FEET) = 155.30 DOWNSTREAM(FEET) = 154.70 <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 SCS Tc <br />LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) <br />COMMERCIAL B 0.05 0.30 0.100 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 RUNOFF(CFS) = 0.28 <br />TOTAL AREA(ACRES) = 0.05 PEAK FLOW RATE(CFS) = 0.28 <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 361.00 TO NODE 370.00 IS CODE = 61 <br />»»>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA««< <br />»»>(STANDARD CURB SECTION USED) ««< <br />UPSTREAM ELEVATION(FEET) = 154.70 DOWNSTREAM ELEVATION(FEET) = 152.20 <br />STREET LENGTH(FEET) - 503.00 CURB HEIGHT(INCHES) - 6.0 <br />STREET HALFWIDTH(FEET) = 22.00 <br />DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 11.00 <br />INSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020 <br />SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 2 <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) = 1.62 <br />STREETFLOW MODEL RESULTS USING ESTIMATED FLOW: <br />STREET FLOW DEPTH(FEET) = 0.26 <br />HALFSTREET FLOOD WIDTH(FEET) = 6.51 <br />AVERAGE FLOW VELOCITY(FEET/SEC.) = 1.49 <br />PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) - 0.38 <br />STREET FLOW TRAVEL TIME(MIN.) = 5.61 Tc(MIN.) = 10.61 <br />* 100 YEAR RAINFALL INTENSITY(INCH/HR) = 4.020 <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 0.73 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) = 0.73 SUBAREA RUNOFF(CFS) = 2.62 <br />EFFECTIVE AREA(ACRES) = 0.78 AREA -AVERAGED Fm(INCH/HR) = 0.03 <br />AREA -AVERAGED Fp(INCH/HR) = 0.30 AREA -AVERAGED Ap = 0.10 <br />TOTAL AREA(ACRES) = 0.8 PEAK FLOW RATE(CFS) = 2.80 <br />END OF SUBAREA STREET FLOW HYDRAULICS: <br />DEPTH(FEET) = 0.30 HALFSTREET FLOOD WIDTH(FEET) = 8.99 <br />FLOW VELOCITY(FEET/SEC.) - 1.69 DEPTH*VELOCITY(FT*FT/SEC.) - 0.50 <br />LONGEST FLOWPATH FROM NODE 360.00 TO NODE 370.00 = 525.00 FEET. <br />a aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa <br />FLOW PROCESS FROM NODE 370.00 TO NODE 370.00 IS CODE = 1 <br />»»>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE««< <br />»»>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES««< <br />TOTAL NUMBER OF STREAMS = 2 <br />CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: <br />TIME OF CONCENTRATION(MIN.) = 10.61 <br />5 <br />