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MEB2.OUT <br />>>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< <br />>>USE TIME -OF -CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA<< <br />---------------------------------------------------------------------------- <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 />* 2 YEAR RAINFALL INTENSITY(INCH/HR) = 2.264 <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 0.10 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) = 0.20 <br />TOTAL AREA(ACRES) = 0.10 PEAK FLOW RATE(CFS) = 0.20 <br />FLOW PROCESS FROM NODE 231.00 TO NODE 240.00 IS CODE = 61 <br />>>>>>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA<<<<< <br />>>>>>(STANDARD CURB SECTION USED)<<<<< <br />---------------------------------------------------------------------------- <br />--------- <br />UPSTREAM ELEVATION(FEET) = 154.60 DOWNSTREAM ELEVATION(FEET) = 142.70 <br />STREET LENGTH(FEET) = 1200.00 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) _ <br />STREETFLOW MODEL RESULTS USING ESTIMATED FLOW: <br />STREET FLOW DEPTH(FEET) = 0.21 <br />HALFSTREET FLOOD WIDTH(FEET) = 4.06 <br />AVERAGE FLOW VELOCITY(FEET/SEC.) = 1.84 <br />PRODUCT OF DEPTH&VELOCITY(FT*FT/SEC.) = 0.38 <br />STREET FLOW TRAVEL TIME(MIN.) = 10.87 Tc(MIN.) _ <br />* 2 YEAR RAINFALL INTENSITY(INCH/HR) = 1.166 <br />SUBAREA LOSS RATE DATA(AMC II): <br />DEVELOPMENT TYPE/ SCS SOIL AREA Fp <br />LAND USE GROUP (ACRES) (INCH/HR) <br />Page 7 <br />15.87 <br />Ap SCS <br />(DECIMAL) CN <br />