914-918 N Bewley St - REV 1 - Plan

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**************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 40.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< >>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< ============================================================================ INITIAL SUBAREA FLOW-LENGTH(FEET) = 37.40 ELEVATION DATA: UPSTREAM(FEET) = 80.40 DOWNSTREAM(FEET) = 80.23 Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 5.484 * 25 YEAR RAINFALL INTENSITY(INCH/HR) = 4.578 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 "2 DWELLINGS/ACRE" A 0.05 0.40 0.700 32 5.48 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.40 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.700 SUBAREA RUNOFF(CFS) = 0.19 TOTAL AREA(ACRES) = 0.05 PEAK FLOW RATE(CFS) = 0.19 **************************************************************************** FLOW PROCESS FROM NODE 40.00 TO NODE 50.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 78.70 DOWNSTREAM(FEET) = 78.40 FLOW LENGTH(FEET) = 25.80 MANNING'S N = 0.013 DEPTH OF FLOW IN 6.0 INCH PIPE IS 2.3 INCHES PIPE-FLOW VELOCITY(FEET/SEC.) = 2.64 ESTIMATED PIPE DIAMETER(INCH) = 6.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.19 PIPE TRAVEL TIME(MIN.) = 0.16 Tc(MIN.) = 5.65 LONGEST FLOWPATH FROM NODE 30.00 TO NODE 50.00 = 63.20 FEET. **************************************************************************** FLOW PROCESS FROM NODE 50.00 TO NODE 50.00 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.) = 5.65 RAINFALL INTENSITY(INCH/HR) = 4.50 AREA-AVERAGED Fm(INCH/HR) = 0.28 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.70 EFFECTIVE STREAM AREA(ACRES) = 0.05 TOTAL STREAM AREA(ACRES) = 0.05 PEAK FLOW RATE(CFS) AT CONFLUENCE = 0.19 ** CONFLUENCE DATA ** STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE 1 0.26 5.88 4.402 0.40( 0.04) 0.10 0.1 10.00 2 0.19 5.65 4.503 0.40( 0.28) 0.70 0.0 30.00 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 0.44 5.65 4.503 0.40( 0.15) 0.37 0.1 30.00 2 0.44 5.88 4.402 0.40( 0.15) 0.37 0.1 10.00 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 0.44 Tc(MIN.) = 5.65 EFFECTIVE AREA(ACRES) = 0.11 AREA-AVERAGED Fm(INCH/HR) = 0.15 AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.37 TOTAL AREA(ACRES) = 0.1 LONGEST FLOWPATH FROM NODE 10.00 TO NODE 50.00 = 155.50 FEET. **************************************************************************** FLOW PROCESS FROM NODE 50.00 TO NODE 80.00 IS CODE = 31 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPE-FLOW TRAVEL TIME THRU SUBAREA<<<<< >>>>>USING COMPUTER-ESTIMATED PIPESIZE (NON-PRESSURE FLOW)<<<<< ============================================================================ ELEVATION DATA: UPSTREAM(FEET) = 78.40 DOWNSTREAM(FEET) = 78.17 FLOW LENGTH(FEET) = 36.20 MANNING'S N = 0.013 DEPTH OF FLOW IN 9.0 INCH PIPE IS 3.6 INCHES PIPE-FLOW VELOCITY(FEET/SEC.) = 2.62 ESTIMATED PIPE DIAMETER(INCH) = 9.00 NUMBER OF PIPES = 1 PIPE-FLOW(CFS) = 0.44 PIPE TRAVEL TIME(MIN.) = 0.23 Tc(MIN.) = 5.88 LONGEST FLOWPATH FROM NODE 10.00 TO NODE 80.00 = 191.70 FEET. **************************************************************************** FLOW PROCESS FROM NODE 80.00 TO NODE 80.00 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.) = 5.88 RAINFALL INTENSITY(INCH/HR) = 4.40 914-918 N Bewley St5/8/2025