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**************************************************************************** <br /> FLOW PROCESS FROM NODE 30.00 TO NODE 40.00 IS CODE = 21 <br /> ---------------------------------------------------------------------------- <br /> >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< <br /> >>USE TIME-OF-CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br /> ============================================================================ <br /> INITIAL SUBAREA FLOW-LENGTH(FEET) = 129.10 <br /> ELEVATION DATA: UPSTREAM(FEET) = 80.86 DOWNSTREAM(FEET) = 79.88 <br /> Tc = K*[(LENGTH** 3.00)/(ELEVATION CHANGE)]**0.20 <br /> SUBAREA ANALYSIS USED MINIMUM Tc(MIN.) = 6.677 <br /> * 100 YEAR RAINFALL INTENSITY(INCH/HR) = 5.242 <br /> SUBAREA Tc AND LOSS RATE DATA(AMC III): <br /> DEVELOPMENT TYPE/ SCS SOIL AREA Fp Ap SCS Tc <br /> LAND USE GROUP (ACRES) (INCH/HR) (DECIMAL) CN (MIN.) <br /> CONDOMINIUMS A 0.36 0.40 0.350 52 6.68 <br /> SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH/HR) = 0.40 <br /> SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.350 <br /> SUBAREA RUNOFF(CFS) = 1.64 <br /> TOTAL AREA(ACRES) = 0.36 PEAK FLOW RATE(CFS) = 1.64 <br /> **************************************************************************** <br /> FLOW PROCESS FROM NODE 50.00 TO NODE 50.00 IS CODE = 1 <br /> ---------------------------------------------------------------------------- <br /> >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<<<<< <br /> >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< <br /> ============================================================================ <br /> TOTAL NUMBER OF STREAMS = 2 <br /> CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: <br /> TIME OF CONCENTRATION(MIN.) = 6.68 <br /> RAINFALL INTENSITY(INCH/HR) = 5.24 <br /> AREA-AVERAGED Fm(INCH/HR) = 0.14 <br /> AREA-AVERAGED Fp(INCH/HR) = 0.40 <br /> AREA-AVERAGED Ap = 0.35 <br /> EFFECTIVE STREAM AREA(ACRES) = 0.36 <br /> TOTAL STREAM AREA(ACRES) = 0.36 <br /> PEAK FLOW RATE(CFS) AT CONFLUENCE = 1.64 <br /> ** CONFLUENCE DATA ** <br /> STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER <br /> NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE <br /> 1 2.37 6.75 5.209 0.40( 0.08) 0.20 0.5 10.00 <br /> 2 1.64 6.68 5.242 0.40( 0.14) 0.35 0.4 30.00 <br /> RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO <br /> CONFLUENCE FORMULA USED FOR 2 STREAMS. <br /> ** PEAK FLOW RATE TABLE ** <br /> STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER <br /> NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE <br /> 1 4.00 6.68 5.242 0.40( 0.10) 0.26 0.9 30.00 <br /> 2 4.00 6.75 5.209 0.40( 0.10) 0.26 0.9 10.00 <br /> COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: <br /> PEAK FLOW RATE(CFS) = 4.00 Tc(MIN.) = 6.75 <br /> EFFECTIVE AREA(ACRES) = 0.87 AREA-AVERAGED Fm(INCH/HR) = 0.10 <br /> AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.26 <br /> TOTAL AREA(ACRES) = 0.9 <br /> LONGEST FLOWPATH FROM NODE 10.00 TO NODE 50.00 = 176.80 FEET. <br /> ============================================================================ <br /> END OF STUDY SUMMARY: <br /> TOTAL AREA(ACRES) = 0.9 TC(MIN.) = 6.75 <br /> EFFECTIVE AREA(ACRES) = 0.87 AREA-AVERAGED Fm(INCH/HR)= 0.10 <br /> AREA-AVERAGED Fp(INCH/HR) = 0.40 AREA-AVERAGED Ap = 0.262 <br /> PEAK FLOW RATE(CFS) = 4.00 <br /> ** PEAK FLOW RATE TABLE ** <br /> STREAM Q Tc Intensity Fp(Fm) Ap Ae HEADWATER <br /> NUMBER (CFS) (MIN.) (INCH/HR) (INCH/HR) (ACRES) NODE <br /> 1 4.00 6.68 5.242 0.40( 0.10) 0.26 0.9 30.00 <br /> 2 4.00 6.75 5.209 0.40( 0.10) 0.26 0.9 10.00 <br /> ============================================================================ <br /> ============================================================================ <br /> END OF RATIONAL METHOD ANALYSIS <br />914-918 N Bewley <br />St5/8/2025