914-918 N Bewley St - REV 1 - Plan

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AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.34 EFFECTIVE STREAM AREA(ACRES) = 0.12 TOTAL STREAM AREA(ACRES) = 0.12 PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.49 **************************************************************************** FLOW PROCESS FROM NODE 90.00 TO NODE 100.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< >>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 70.90 ELEVATION DATA: UPSTREAM(FEET) = 80.65 DOWNSTREAM(FEET) = 80.25 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.381 * 25 YEAR RAINFALL INTENSITY(INCH/HR) = 4.202 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.) RESIDENTIAL "3-4 DWELLINGS/ACRE" A 0.08 0.40 0.600 32 6.38 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.40 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.600 SUBAREA RUNOFF(CFS) = 0.27 TOTAL AREA(ACRES) = 0.08 PEAK FLOW RATE(CFS) = 0.27 **************************************************************************** FLOW PROCESS FROM NODE 100.00 TO NODE 100.00 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.) = 6.38 RAINFALL INTENSITY(INCH/HR) = 4.20 AREA-AVERAGED Fm(INCH/HR) = 0.24 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.60 EFFECTIVE STREAM AREA(ACRES) = 0.08 TOTAL STREAM AREA(ACRES) = 0.08 PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.27 ** CONFLUENCE DATA ** STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE 1 0.46 5.02 4.815 0.40( 0.14) 0.34 0.1 60.00 1 0.49 5.89 4.396 0.40( 0.14) 0.34 0.1 30.00 1 0.49 6.12 4.301 0.40( 0.14) 0.34 0.1 10.00 2 0.27 6.38 4.202 0.40( 0.24) 0.60 0.1 90.00 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 0.71 5.02 4.815 0.40( 0.17) 0.44 0.2 60.00 2 0.75 5.89 4.396 0.40( 0.18) 0.44 0.2 30.00 3 0.76 6.12 4.301 0.40( 0.18) 0.44 0.2 10.00 4 0.75 6.38 4.202 0.40( 0.18) 0.44 0.2 90.00 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 0.76 Tc(MIN.) = 6.12 EFFECTIVE AREA(ACRES) = 0.19 AREA-AVERAGED Fm(INCH/HR) = 0.18 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.44 TOTAL AREA(ACRES) = 0.2 LONGEST FLOWPATH FROM NODE 10.00 TO NODE 100.00 = 194.30 FEET. **************************************************************************** FLOW PROCESS FROM NODE 100.00 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) = 78.15 DOWNSTREAM(FEET) = 77.42 FLOW LENGTH(FEET) = 110.20 MANNING'S N = 0.013 DEPTH OF FLOW IN 9.0 INCH PIPE IS 4.9 INCHES PIPE-FLOW VELOCITY(FEET/SEC.) = 3.06 ESTIMATED PIPE DIAMETER(INCH) = 9.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.76 PIPE TRAVEL TIME(MIN.) = 0.60 Tc(MIN.) = 6.72 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 = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< ============================================================================ TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 6.72 RAINFALL INTENSITY(INCH/HR) = 4.08 AREA-AVERAGED Fm(INCH/HR) = 0.18 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.44 EFFECTIVE STREAM AREA(ACRES) = 0.19 TOTAL STREAM AREA(ACRES) = 0.20 914-918 N Bewley St5/8/2025