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HomeMy WebLinkAboutCHERRY STREET COTTAGES - PDP - PDP160041 - SUBMITTAL DOCUMENTS - ROUND 2 - STORMWATER-RELATED DOCUMENTS (20)100 Year This is to convert % imp. to a C value 100-year (must insert % imp. and C pervious). ft3 acre-ft. 'C' value 0.56 8507.5 0.195 'C' * 1.25 0.7 This has to be .7 for 100yr. From NRCS tables Area 1.12 acres Modified Modified Release Rate 0.35 M. FATER D. JUDISH C. LI 5/95 Nov-97 Nov-98 DETENTION POND SIZING TIME TIME INTENSITY Q 100 Runoff Release Required Required cum 100 year Volume Cum total Detention Detention (mins) (secs) (in/hr) (cfs) (ft^3) (ft^3) (ft^3) (ac-ft) 0 0 0 0.00 0 0.0 0.0 0.0000 5 300 9.950 7.80 2340.24 105.0 2235.2 0.0513 10 600 7.720 6.05 3631.488 210.0 3421.5 0.0785 15 900 6.520 5.11 4600.512 315.0 4285.5 0.0984 20 1200 5.600 4.39 5268.48 420.0 4848.5 0.1113 25 1500 4.980 3.90 5856.48 525.0 5331.5 0.1224 30 1800 4.520 3.54 6378.624 630.0 5748.6 0.1320 35 2100 4.080 3.20 6717.312 735.0 5982.3 0.1373 40 2400 3.740 2.93 7037.184 840.0 6197.2 0.1423 45 2700 3.460 2.71 7324.128 945.0 6379.1 0.1464 50 3000 3.230 2.53 7596.96 1050.0 6547.0 0.1503 55 3300 3.030 2.38 7839.216 1155.0 6684.2 0.1534 60 3600 2.860 2.24 8072.064 1260.0 6812.1 0.1564 65 3900 2.720 2.13 8316.672 1365.0 6951.7 0.1596 70 4200 2.590 2.03 8528.352 1470.0 7058.4 0.1620 75 4500 2.480 1.94 8749.44 1575.0 7174.4 0.1647 80 4800 2.380 1.87 8956.416 1680.0 7276.4 0.1670 85 5100 2.290 1.80 9156.336 1785.0 7371.3 0.1692 90 5400 2.210 1.73 9356.256 1890.0 7466.3 0.1714 95 5700 2.130 1.67 9518.544 1995.0 7523.5 0.1727 100 6000 2.060 1.62 9690.24 2100.0 7590.2 0.1742 105 6300 2.000 1.57 9878.4 2205.0 7673.4 0.1762 110 6600 1.940 1.52 10038.34 2310.0 7728.3 0.1774 115 6900 1.890 1.48 10224.14 2415.0 7809.1 0.1793 120 7200 1.840 1.44 10386.43 2520.0 7866.4 0.1806 125 7500 1.790 1.40 10525.2 2625.0 7900.2 0.1814 130 7800 1.750 1.37 10701.6 2730.0 7971.6 0.1830 135 8100 1.710 1.34 10859.18 2835.0 8024.2 0.1842 140 8400 1.670 1.31 10997.95 2940.0 8058.0 0.1850 145 8700 1.630 1.28 11117.9 3045.0 8072.9 0.1853 150 9000 1.600 1.25 11289.6 3150.0 8139.6 0.1869 155 9300 1.570 1.23 11447.18 3255.0 8192.2 0.1881 160 9600 1.540 1.21 11590.66 3360.0 8230.7 0.1889 165 9900 1.510 1.18 11720.02 3465.0 8255.0 0.1895 170 10200 1.480 1.16 11835.26 3570.0 8265.3 0.1897 175 10500 1.450 1.14 11936.4 3675.0 8261.4 0.1897 180 10800 1.420 1.11 12023.42 3780.0 8243.4 0.1892 185 11100 1.400 1.10 12183.36 3885.0 8298.4 0.1905 190 11400 1.380 1.08 12333.89 3990.0 8343.9 0.1915 195 11700 1.360 1.07 12475.01 4095.0 8380.0 0.1924 200 12000 1.340 1.05 12606.72 4200.0 8406.7 0.1930 205 12300 1.320 1.03 12729.02 4305.0 8424.0 0.1934 210 12600 1.300 1.02 12841.92 4410.0 8431.9 0.1936 215 12900 1.280 1.00 12945.41 4515.0 8430.4 0.1935 220 13200 1.260 0.99 13039.49 4620.0 8419.5 0.1933 225 13500 1.240 0.97 13124.16 4725.0 8399.2 0.1928 230 13800 1.220 0.96 13199.42 4830.0 8369.4 0.1921 235 14100 1.210 0.95 13375.82 4935.0 8440.8 0.1938 240 14400 1.200 0.94 13547.52 5040.0 8507.5 0.1953 Required detention Page 1