1010 N BROADWAY EVCC 2018-01-01 MF Import

Index Hall Replacement: Building Site Volume Reduction Calculations Volume Reduction(2-yr,24-hr event): POC 1 Predeveloped POC 1 Mitigated Predeveloped Predeveloped Developed Average Developed Ill flow flow Time(sec) Average Flow Rate Volume Flow Rate Volume cfs cfs sec cfs cf cfs cf 6/8/1984 9:00 0.001 0.000 3600 6/8/1984 10:00 0.001 0.000 3600 0.0011 4.03 0.0003 1.00 6/8/1984 11:00 0.001 0.000 3600 0.0009 3.27 0.0003 0.93 6/8/1984 12:00 0.001 0.000 3600 0.0008 2.73 0.0002 0.87 6/8/1984 13:00 0.001 0.000 3600 0.0006 2.34 0.0002 0.82 6/8/1984 14:00 0.001 0.000 3600 0.0006 2.04 0.0002 0.77 6/8/1984 15:00 0.000 0.000 3600 0.0005 1.81 0.0002 0.73 6/8/1984 16:00 0.000 0.000 3600 0.0005 1.63 0.0002 0.70 6/8/1984 17:00 0.000 0.000 3600 0.0004 1.48 0.0002 0.66 6/8/1984 18:00 0.033 0.011 3600 0.0167 59.94 0.0056 20.30 6/8/1984 19:001 .` '10.436 3600 0.3764 1355.16 0.2234 804.11 6/8/1984 20:00 0.163 0.336 3600 0.4415 1589.34 0.3859 1389.20 6/8/1984 21:00 0.053 0.013 3600 0.1080 388.89 0.1747 628.81 6/8/1984 22:00 0.024 0.007 3600 0.0383 138.01 0.0103 37.09 6/8/1984 23:00 0.013 0.005 3600 0.0184 66.28 0.0062 22.35 6/9/1984 0.009 0.004 3600 0.0109 39.40 0.0044 15.87 6/9/1984 1:00 0.006 0.003 3600 0.0076 27.25 0.0035 12.55 6/9/1984 2:00 0.005 0.003 3600 0.0058 20.94 0.0030 10.65 6/9/1984 3:00 0.092 0.011 3600 0.0487 175.38 0.0070 25.10 6/9/1984 4:00 0.044 0.009 3600 0.0680 244.65 0.0099 35.67 6/9/1984 5:00 0.021 0.006 3600 0.0322 115.95 0.0072 25.75 6/9/1984 6:00 0.012 0.004 3600 0.0165. 59.32 0.0050 17.93 6/9/1984 7:00 0.008 0.004 3600 0.0103 37.06 0.0039 14.06 6/9/1984 8:00 0.006 0.003 3600 0.0074 26.63 0.0033 11.87 6/9/1984 9:00 0.005 0.003 3600 0.0058 21.05 0.0029 10.51 4384.57 3088.26 Total Volume(cf) lito%:reduction in volume 0.800 .._.__ _..._. _.... _.___ _... _...... _.. _.. _._----.. .. ..- .... -.. 2-yr,24-hr Storm Event 0.700 awa 0.500 . . U 0.400 .---Predeveloped Flow s 3 LL ,. -• -Mitigated Flow 0.300 .._...__.... ..... ... .. __._....__ I .....-.__....... _ 0.200 __..._ __ ........... .. ..._._...._ - t0.100 .........__.,.,_....._.......___....__-__ .._. ............._ .__ ..........._ 1 ,.. 6/8/1984 4:48 6/8/1984 9:36 6/8/1984 14:24 6/8/1984 19:12 6/9/1984 0:00 6/9/1984 4:48 6/9/1984 9:36 6/9/1984 14:24 Date&Time Assumptions: Raingarden Detention/infiltration Pipe Located in Area#2 70.00 If 500.00 sf 3.00 ft diameter 0.20 porosity 0.10 in/hr infiltration rate 1.50 ft gravel bed MODELED AS 1.00 ft freeboard 350.00 sf trench(70x5) 0.10 in/hr infiltration rate 1st layer 3.00 ft deep 0.65 porosity 2nd layer 1 ft deep 0.33 porosity