2022 08 Drainage Report

2022-07-28 Proposed Hydrology Prepared by Dynamic Engineering HydroCAD® 10.20-2d_sin 08640_© 2021 HydroCAD Software Solutions LLC NOAA 24-hr D 100-Year Rainfall=8.66" Printed 8/5/2022 Page 107 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 18: Basin A- Imp. Subcatchment 3S: Basin A - Perv. ‘Subcatchment 4S: Basin B - Imp. ‘Subcatchment 5S: Basin B - Perv. ‘Subcatchment 7S: Basin C - Imp. Subcatchment 8S: Basin C - Perv. ‘Subcatchment 9S; Mt, Pleasant Ave ‘Subcatchment 10S: Mt. Pleasant Ave Subcatchment 11S: Basin D - Imp. ‘Subcatchment 12S: Basin D - Perv. Pond 3P: Basin A Pond 4P: Basin B Pond 5P: Basin C Pond 6P: Basin D Link 2L: Mt, Pleasant Ave. Link 3L: Mt, Pleasant Ave - Undetained Runoff Area=4,655 sf 10.00% impervious Runoff Depth=8.42" To=10.0 min CN=98 Runoff=0.76 cfs 0.075 af Runoff Area=24,500 sf 0.00% Impervious Runoff Depth=5.52" ‘Tc=10.0 min CN=74. Runoff=3.04 cfs 0.259 af Runoff Area=4,648 sf 10.00% Impervious Runoff Depth=8.42" Tc=10,0 min CN=98 Runoff=0.76 ofs 0.075 af Runoff Area=31,571 sf 0.00% Impervious Runoff Depth=5.52" Tc=10.0 min CN=74 Runoff=3.92 cfs 0.333 af Runoff Area=4,635 sf 100.00% Impervious Runoff Depth=8.42" Tc=10.0 min CN=98 Runoff=0.75 cts 0.075 af Runoff Area=31,149 sf 0.00% Impervious Runoff Depth=5.52" To=10.0 min CN=74 Runoff=3.87 cfs 0.329 af Runoff Area=1,706 sf 10.00% Impervious Runoff Depth=6.42" ‘To=10.0 min CN=98 Runoff=0.28 cfs 0.027 af Runoff Area=40,319 sf 0.00% Impervious Runoff Depth=5.52" Tc=10.0 min CN=74 Runoff=5.01 cfs 0.426 af Runoff Area=2,400 sf 100.00% Impervious Runoff Depth=8.42" Tc=10.0 min CN=98 Runoff=0.39 cfs 0.039 af Runoff Area=15,983 sf 0.00% Impervious Runoff Depth=5.52" To=10.0 min CN=74 Runoff=1.98 cfs 0.169 af Peak Elev=626.67' Storage=7,334 of inflow=3.80 cfs 0.334 af Outflow=0.77 cls 0.217 af Peak Elev=624.97" Storage=8,436 cf_Inflow=4.67 cfs 0.408 af Outflow=1.02 cfs 0.306 af Peak Elev=621.26' Storage=7,839 cf _Inflow=4.62 cfs 0.404 af Qutflow=1.47 cfs 0.285 af Peak Elev=616.75' Storage=4,291 of Inflow=2.37 cfs 0.207 af Outflow=0.82 cfs 0.125 af Inflow=7.51 ofs 1.387 af Primary=7.51 cfs 1.387 af Inflow=5.28 cfs 0.453 af Primary=5.28 cfs 0.453 af 2022-07-28 Proposed Hydrology NOAA 24-hr D.100-Year

2.37 cfs 0.207 af Outflow=0.82 cfs 0.125 af Inflow=7.51 ofs 1.387 af Primary=7.51 cfs 1.387 af Inflow=5.28 cfs 0.453 af Primary=5.28 cfs 0.453 af 2022-07-28 Proposed Hydrology NOAA 24-hr D.100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 8/5/2022 HydroCAD® 10.20-2d s/n 08640 © 2021 HydroCAD Software Solutions LLC. Page 108 Total Runoff Area = 3.709 ac_ Runoff Volume = 1.806 af Average Runoff Depth = 5.84" 98.83% Pervious = 3.295 ac 11.17% Impervious = 0.414 ac