Loading...
HomeMy WebLinkAboutPM 17771 Public Storm Drain COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 39.98 Tc(MIN.) = 10.54 EFFECTIVE AREA(ACRES) = 18.92 AREA- AVERAGED Fm(INCH /HR) = 0.46 AREA- AVERAGED Fp(INCH /HR) = 0.87 AREA- AVERAGED Ap = 0.52 TOTAL AREA(ACRES) = 34.00 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 111.00 = 1600.00 FEET. ********************************************* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 111.00 TO NODE 112.00 IS CODE = 61 » »>COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA« «< » »>(STANDARD CURB SECTION USED) « «< UPSTREAM ELEVATION(FEET) = 1645.00 DOWNSTREAM ELEVATION(FEET) = 1640.00 STREET LENGTH(FEET) = 400.00 CURB HEIGHT(INCHES) = 8.0 STREET HALFWIDTH(FEET) = 25.00 DISTANCE FROM CROWN TO CROSSFALL GRADEBREAK(FEET) = 10.00 INSIDE STREET CROSSFALL(DECIMAL) = 0.020 OUTSIDE STREET CROSSFALL(DECIMAL) = 0.020 SPECIFIED NUMBER OF HALFSTREETS CARRYING RUNOFF = 2 Manning's FRICTION FACTOR for Streetflow Section(curb -to -curb) = 0.0149 * *TRAVEL TIME COMPUTED USING ESTIMATED FLOW(CFS) = 59.32 ** *STREET FLOWING FULL * ** STREETFLOW MODEL RESULTS USING ESTIMATED FLOW: • STREET FLOW DEPTH(FEET) = 0.66 HALFSTREET FLOOD WIDTH(FEET) = 25.00 AVERAGE FLOW VELOCITY(FEET /SEC.) = 4.51 PRODUCT OF DEPTH & VELOCITY(FT*FT /SEC.) = 2.99 STREET FLOW TRAVEL TIME(MIN.) = 1.48 Tc(MIN.) = 12.01 * 10 YEAR RAINFALL INTENSITY(INCH /HR) = 2.625 SUBAREA LOSS RATE DATA(AMC II): DEVELOPMENT TYPE/ SCS SOIL AREA FP Ap SCS LAND USE GROUP (ACRES) (INCH /HR) (DECIMAL) CN COMMERCIAL A 10.00 0.98 0.10 32 NATURAL FAIR COVER "OPEN BRUSH" A 10.00 0.86 1.00 46 SUBAREA AVERAGE PERVIOUS LOSS RATE, Fp(INCH /HR) = 0.87 SUBAREA AVERAGE PERVIOUS AREA FRACTION, Ap = 0.55 SUBAREA AREA(ACRES) = 20.00 SUBAREA RUNOFF(CFS) = 38.63 EFFECTIVE AREA(ACRES) = 38.92 AREA- AVERAGED Fm(INCH /HR) = 0.47 AREA- AVERAGED Fp(INCH /HR) = 0.87 AREA- AVERAGED Ap = 0.54 TOTAL AREA(ACRES) = 54.00 PEAK FLOW RATE(CFS) = 75.54 END OF SUBAREA STREET FLOW HYDRAULICS: DEPTH(FEET) = 0.71 HALFSTREET FLOOD WIDTH(FEET) = 25.00 FLOW VELOCITY(FEET /SEC.) = 4.96 DEPTH *VELOCITY(FT *FT /SEC.) = 3.50 LONGEST FLOWPATH FROM NODE 100.00 TO NODE 112.00 = 2000.00 FEET. ********************************************* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 112.00 TO NODE 113.00 IS CODE = 61 » » >COMPUTE STREET FLOW TRAVEL TIME THRU SUBAREA« «< » »>(STANDARD CURB SECTION USED) « «< it 1 415.46 11.26 3.819 0.88( 0.38) 0.44 125.0 410.00 2 348.97 6.85 5.146 0.88( 0.38) 0.43 74.3 300.00 3 402.85 10.17 4.062 0.88( 0.38) 0.43 112.7 240.00 4 423.47 12.17 3.647 0.88( 0.38) 0.44 134.5 200.00 5 432.52 15.16 3.196 0.88( 0.40) 0.46 161.5 110.00 6 256.59 33.13 1.999 0.87( 0.44) 0.50 176.4 100.00 TOTAL AREA(ACRES) = 176.40 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 432.52 Tc(MIN.) = 15.159 EFFECTIVE AREA(ACRES) = 161.49 AREA- AVERAGED Fm(INCH /HR) = 0.40 AREA- AVERAGED Fp(INCH /HR) = 0.88 AREA- AVERAGED Ap = 0.46 TOTAL AREA(ACRES) = 176.40 LONGEST FLOWPATH FROM NODE 410.00 TO NODE 415.00 = 1220.00 FEET. FLOW PROCESS FROM NODE 415.00 TO NODE 415.00 IS CODE = 12 » » >CLEAR MEMORY BANK # 1 ««< ********************************************* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 415.00 TO NODE 422.00 IS CODE = 31 » » >COMPUTE PIPE -FLOW TRAVEL TIME THRU SUBAREA« «< » » >USING COMPUTER - ESTIMATED PIPESIZE (NON- PRESSURE FLOW) « «< ELEVATION DATA: UPSTREAM(FEET) = 1540.90 DOWNSTREAM(FEET) = 1538.23 FLOW LENGTH(FEET) = 291.80 MANNING'S N = 0.013 DEPTH OF FLOW IN 75.0 INCH PIPE IS 60.3 INCHES PIPE -FLOW VELOCITY(FEET /SEC.) = 16.36 ESTIMATED PIPE DIAMETER(INCH) = 75.00 NUMBER OF PIPES = 1 PIPE- FLOW(CFS) = 432.52 PIPE TRAVEL TIME(MIN.) = 0.30 Tc(MIN.) = 15.46 LONGEST FLOWPATH FROM NODE 410.00 TO NODE 422.00 = 1511.80 FEET. ********-************************************* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 422.00 TO NODE 422.00 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.) = 15.46 RAINFALL INTENSITY(INCH /HR) = 3.16 AREA- AVERAGED Fm(INCH /HR) = 0.40 AREA- AVERAGED Fp(INCH /HR) = 0.88 AREA- AVERAGED Ap = 0.46 EFFECTIVE STREAM AREA(ACRES) = 161.49 TOTAL STREAM AREA(ACRES) = 176.40 PEAK FLOW RATE(CFS) AT CONFLUENCE = 432.52 ********************************************* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** FLOW PROCESS FROM NODE 420.00 TO NODE 421.00 IS CODE = 21 » » >RATIONAL METHOD INITIAL SUBAREA ANALYSIS« «< »USE TIME -OF- CONCENTRATION NOMOGRAPH FOR INITIAL SUBAREA« 4