2022 08 Drainage Report

2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" 2022-07-28 Proposed Hydrology NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Dynamic Engineering Printed 8/5/2022 Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d_s/n 08640 © 2021 HydroCAD Software Solutions LLC Page 57 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC. Page 58 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Basin A- Imp. Runoff Area=4,655 sf 100.0% Impervious Runoff Depth=4.98" Tc=10,0 min CN=98 Runoff=0.45 cis 0.044 af Subcatchment 3S: Basin A - Perv. Runoff Area=24,500 sf 0,00% Impervious Runoff Depth=2.54" To=10.0 min CN=74 Runoff=1.41 cfs 0.119 af Subcatchment 4S: Basin B -Imp. Runoff Area=4,648 sf 100.00% Impervious Runoff Depth=4.98" Tc=10.0 min CN=98 Runoff=0.45 cfs 0.044 af ‘Subcatchment 5S: Basin B - Perv. Runoff Area=31,571 sf 0.00% Impervious Runoff Depth=2.54" To=10.0 min CN=74 Runoff=1.82 cfs 0.193 af Subcatchment 7S: Basin C - Imp. Runoff Area=4,635 sf 100.00% Impervious Runoff Depth=4.98" Te=10.0 min CN=98 Runoff=0.45 cfs 0.044 af ‘Subcatchment 8S: Basin C - Perv. Runoff Area=31,149 sf 0.00% Impervious Runoff Depth=2.54" To=10.0 min CN=74 Runoff=1.79 cis 0.151 af ‘Subcatchment 95: Mt. Pleasant Ave Runoff Area=1,706 sf _100.00% Impervious Runoff Depth=4,98" Tc=10.0 min CN=98 Runoff=0.17 cfs 0.016 af ‘Subcatchment 10S: Mt, Pleasant Ave Runoff Area=40,319 sf 0.00% Impervious Runoff Depth=2.54” To=10.0 min CN=74 Runoff=2.32 cfs 0.196 af ‘Subcatchment 11S: Basin D - Imp. Runoff Area=2,400 sf 100.00% Impervious Runoff Depth=4.98" Tc=10.0 min CN=98 Runoff=0.23 cfs 0.023 af ‘Subcatchment 12S: Basin D - Perv. Runoff Area=15,983 sf 0.00% Impervious Runoff Depth=2.54" Tc=10.0 min CN=74 Runoff=0.92 cfs 0.078 af Pond 3P: Basin A Peak Elev=626.06' Storage=5,275 cf_Inflow=1.87 cfs 0.163 af Outflow=0.09 cis 0.047 af Pond 4P: Basin B Peak Elev=623.95' Storage=4,910 cf _Inflow=2.27 cfs 0.198 af Outfiow=0.30 cfs 0.096 af Pond 5P: Basin C Peak Elev=620.59' Storage=5,470 of _Inflow=2.24 cfs 0.196 af Outfiow=0.18 cfs 0.077 af Pond 6P: Basin D Peak Elev=616.53' Storage=3,655 of Inflow=1.15 ofs 0.101 af Outfiow=0.03 cfs 0.019 af Link 2L: Mt, Pleasant Ave. Inflow=2.49 cfs 0.450 af Primary=2,49

6 af Outfiow=0.18 cfs 0.077 af Pond 6P: Basin D Peak Elev=616.53' Storage=3,655 of Inflow=1.15 ofs 0.101 af Outfiow=0.03 cfs 0.019 af Link 2L: Mt, Pleasant Ave. Inflow=2.49 cfs 0.450 af Primary=2,49 cfs 0.450 af Link 3L: Mt. Pleasant Ave - Undetained Inflow=2.49 cfs 0.212 af Primary=2.49 cfs. 0.212 af Total Runoff Area = 3.709 ac Runoff Volume = 0.870 af Average Runoff Depth = 2.81" 88.83% Pervious = 3.295 ac 11.17% Impervious = 0.414 ac