914-918 N Bewley St - REV 1 - Plan

Home Browse Search

PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.76 **************************************************************************** FLOW PROCESS FROM NODE 110.00 TO NODE 120.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< >>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 165.70 ELEVATION DATA: UPSTREAM(FEET) = 81.56 DOWNSTREAM(FEET) = 80.39 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.738 * 25 YEAR RAINFALL INTENSITY(INCH/HR) = 4.074 SUBAREA Tc AND LOSS RATE DATA(AMC II): DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) APARTMENTS A 0.52 0.40 0.200 32 6.74 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.40 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.200 SUBAREA RUNOFF(CFS) = 1.86 TOTAL AREA(ACRES) = 0.52 PEAK FLOW RATE(CFS) = 1.86 **************************************************************************** FLOW PROCESS FROM NODE 120.00 TO NODE 130.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 79.73 DOWNSTREAM(FEET) = 77.42 FLOW LENGTH(FEET) = 11.10 MANNING'S N = 0.013 DEPTH OF FLOW IN 6.0 INCH PIPE IS 3.9 INCHES PIPE-FLOW VELOCITY(FEET/SEC.) = 13.92 ESTIMATED PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 1.86 PIPE TRAVEL TIME(MIN.) = 0.01 Tc(MIN.) = 6.75 LONGEST FLOWPATH FROM NODE 110.00 TO NODE 130.00 = 176.80 FEET. **************************************************************************** FLOW PROCESS FROM NODE 130.00 TO NODE 130.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 6.75 RAINFALL INTENSITY(INCH/HR) = 4.07 AREA-AVERAGED Fm(INCH/HR) = 0.08 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.20 EFFECTIVE STREAM AREA(ACRES) = 0.52 TOTAL STREAM AREA(ACRES) = 0.52 PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.86 ** CONFLUENCE DATA ** STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE 1 0.71 5.62 4.515 0.40( 0.17) 0.44 0.2 60.00 1 0.75 6.49 4.162 0.40( 0.18) 0.44 0.2 30.00 1 0.76 6.72 4.079 0.40( 0.18) 0.44 0.2 10.00 1 0.75 6.98 3.994 0.40( 0.18) 0.44 0.2 90.00 2 1.86 6.75 4.070 0.40( 0.08) 0.20 0.5 110.00 RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE 1 2.43 5.62 4.515 0.40( 0.11) 0.26 0.6 60.00 2 2.58 6.49 4.162 0.40( 0.11) 0.27 0.7 30.00 3 2.61 6.72 4.079 0.40( 0.11) 0.27 0.7 10.00 4 2.61 6.75 4.070 0.40( 0.11) 0.27 0.7 110.00 5 2.57 6.98 3.994 0.40( 0.11) 0.27 0.7 90.00 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 2.61 Tc(MIN.) = 6.75 EFFECTIVE AREA(ACRES) = 0.71 AREA-AVERAGED Fm(INCH/HR) = 0.11 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.27 TOTAL AREA(ACRES) = 0.7 LONGEST FLOWPATH FROM NODE 10.00 TO NODE 130.00 = 304.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 130.00 TO NODE 130.00 IS CODE = 82 ---------------------------------------------------------------------------- >>>>>ADD SUBAREA RUNOFF TO MAINLINE, AT MAINLINE Tc,<<<<< >>>>>(AND COMPUTE INITIAL SUBAREA RUNOFF)<<<<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 129.10 ELEVATION DATA: UPSTREAM(FEET) = 80.86 DOWNSTREAM(FEET) = 79.88 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.677 * 25 YEAR RAINFALL INTENSITY(INCH/HR) = 4.095 SUBAREA Tc AND LOSS RATE DATA(AMC II): DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) CONDOMINIUMS A 0.16 0.40 0.350 32 6.68 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.40 914-918 N Bewley St5/8/2025