complete drainage report rev 9

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 211 Summary for Link 28L: POA 2 Inflow Area = Inflow = Primary = 722,187 sf, 47.85% Impervious, Inflow Depth = 1.71" for 10-Year event 15.29 cfs @ 12.20 hrs, Volume= 102,660 cf 15.29 cfs @ 12.20 hrs, Volume= 102,660 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Link 28L: POA 2 Hydrograph 17 16 15 Inflow Primary 15.29 cfs 15.29 cfs Inflow Area=722,187 sf 14 13 12 Flow (cfs) 11 10 9 8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 212 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 28L: POA 2 Time (hours) 0.00 0.80 1.60 2.40 3.20 4.00 4.80 5.60 6.40 7.20 8.00 8.80 9.60 10.40 11.20 12.00 12.80 13.60 14.40 15.20 16.00 16.80 17.60 18.40 19.20 20.00 20.80 21.60 22.40 23.20 24.00 24.80 25.60 26.40 27.20 28.00 28.80 29.60 30.40 31.20 32.00 32.80 33.60 34.40 35.20 36.00 36.80 37.60 38.40 39.20 40.00 Inflow (cfs) 0.00 0.00 0.03 0.05 0.06 0.07 0.08 0.09 0.11 0.13 0.17 0.22 0.34 0.52 1.09 6.04 4.89 3.33 2.55 1.97 1.63 1.38 1.17 1.00 0.90 0.82 0.76 0.70 0.65 0.60 0.56 0.28 0.22 0.18 0.14 0.12 0.10 0.09 0.07 0.06 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.02 0.02 0.02 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.03 0.05 0.06 0.07 0.08 0.09 0.11 0.13 0.17 0.22 0.34 0.52 1.09 6.04 4.89 3.33 2.55 1.97 1.63 1.38 1.17 1.00 0.90 0.82 0.76 0.70 0.65 0.60 0.56 0.28 0.22 0.18 0.14 0.12 0.10 0.09 0.07 0.06 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.02 0.02 0.02 Time (hours) 40.80 41.60 42.40 43.20 44.00 44.80 45.60 46.40 47.20 48.00 48.80 49.60 50.40 51.20 52.00 52.80 53.60 54.40 55.20 56.00 56.80 57.60 58.40 59.20 60.00 60.80 61.60 62.40 63.20 64.00 64.80 65.60 66.40 67.20 68.00 68.80 69.60 70.40 71.20 72.00 72.80 73.60 74.40 75.20 76.00 76.80 77.60 78.40 79.20 80.00 Inflow (cfs) 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0

.00 0.00 0.00 0.00 Primary (cfs) 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 213 Summary for Link 34L: DA 2 Undetained Inflow Area = 172,465 sf, 30.45% Impervious, Inflow Depth = 3.47" for 10-Year event Inflow = 13.00 cfs @ 12.17 hrs, Volume= 49,875 cf Primary = 13.00 cfs @ 12.17 hrs, Volume= 49,875 cf, Atten= 0%, Lag= 0.0 min Routed to Link 28L : POA 2 Primary outflow = Inflow, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Link 34L: DA 2 Undetained Hydrograph 14 13.00 cfs 13 Inflow Primary 13.00 cfs Inflow Area=172,465 sf 12 11 10 Flow (cfs) 9 8 7 6 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 214 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 34L: DA 2 Undetained Time (hours) 0.00 0.80 1.60 2.40 3.20 4.00 4.80 5.60 6.40 7.20 8.00 8.80 9.60 10.40 11.20 12.00 12.80 13.60 14.40 15.20 16.00 16.80 17.60 18.40 19.20 20.00 20.80 21.60 22.40 23.20 24.00 24.80 25.60 26.40 27.20 28.00 28.80 29.60 30.40 31.20 32.00 32.80 33.60 34.40 35.20 36.00 36.80 37.60 38.40 39.20 40.00 Inflow (cfs) 0.00 0.00 0.03 0.05 0.06 0.07 0.08 0.09 0.11 0.13 0.17 0.22 0.34 0.52 1.09 5.83 2.18 1.07 0.78 0.56 0.49 0.43 0.37 0.32 0.30 0.29 0.27 0.25 0.24 0.22 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.03 0.05 0.06 0.07 0.08 0.09 0.11 0.13 0.17 0.22 0.34 0.52 1.09 5.83 2.18 1.07 0.78 0.56 0.49 0.43 0.37 0.32 0.30 0.29 0.27 0.25 0.24 0.22 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time (hours) 40.80 41.60 42.40 43.20 44.00 44.80 45.60 46.40 47.20 48.00 48.80 49.60 50.40 51.20 52.00 52.80 53.60 54.40 55.20 56.00 56.80 57.60 58.40 59.20 60.00 60.80 61.60 62.40 63.20 64.00 64.80 65.60 66.40 67.20 68.00 68.80 69.60 70.40 71.20 72.00 72.80 73.60 74.40 75.20 76.00 76.80 77.60 78.40 79.20 80.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0

.00 0.00 0.00 0.00 0.00 0.00 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 215 Time span=0.00-80.00 hrs, dt=0.04 hrs, 2001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=6,824 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=98 Runoff=1.19 cfs 4,788 cf Subcatchment 19S: Basin 3 - Imp Runoff Area=15,086 sf 0.00% Impervious Runoff Depth=5.52" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=74 Runoff=2.02 cfs 6,940 cf Subcatchment 20S: 15775.6 Runoff Area=41,524 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=98 Runoff=7.95 cfs 29,135 cf Subcatchment 21S: Basin 4 - Imp Runoff Area=7,526 sf 0.00% Impervious Runoff Depth=5.52" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=74 Runoff=1.11 cfs 3,462 cf Subcatchment 24S: Basin 4 - Perv Subcatchment 25S: Basin 2 - Perv Runoff Area=82,260 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=463' Tc=10.5 min CN=77 Runoff=10.70 cfs 40,328 cf Subcatchment 28S: Basin 2 - Imp Runoff Area=30,173 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=463' Tc=10.5 min CN=98 Runoff=4.86 cfs 21,171 cf Subcatchment 29S: Basin 8 - Imp Runoff Area=38,257 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=165' Tc=8.6 min CN=98 Runoff=6.60 cfs 26,843 cf Subcatchment 30S: Basin 8 - Perv Runoff Area=22,787 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=165' Tc=8.6 min CN=77 Runoff=3.19 cfs 11,171 cf Subcatchment 31S: Basin 7 - Imp Runoff Area=45,778 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=760' Tc=12.5 min CN=98 Runoff=6.97 cfs 32,120 cf Subcatchment 32S: Basin 7 - Perv Runoff Area=58,678 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=760' Tc=12.5 min CN=77 Runoff=7.20 cfs 28,767 cf Subcatchment 35S: DA 2 Und - Imp Runoff Area=52,513 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=160' Tc=9.8 min CN=98 Runoff=8.68 cfs 36,846 cf Subcatchment 36S: DA 2 Und - Perv Runoff Area=119,952 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=160' Tc=9.8 min CN=77 Runoff=16.02 cfs 58,807 cf Subcatchment 45S: Basin 11 - Imp Runoff Area=59,901 sf 100.00% Impervious Runoff Depth=8.42" Flow

sf 0.00% Impervious Runoff Depth=5.88" Flow Length=160' Tc=9.8 min CN=77 Runoff=16.02 cfs 58,807 cf Subcatchment 45S: Basin 11 - Imp Runoff Area=59,901 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=233' Tc=9.8 min CN=98 Runoff=9.90 cfs 42,030 cf Subcatchment 46S: Basin 11 - Perv Runoff Area=24,202 sf 0.00% Impervious Runoff Depth=5.76" Flow Length=233' Tc=9.8 min CN=76 Runoff=3.18 cfs 11,621 cf Subcatchment 51S: Basin 10 - Imp Runoff Area=53,114 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=379' Tc=10.7 min CN=98 Runoff=8.52 cfs 37,268 cf Subcatchment 52S: Basin 10 - Perv Runoff Area=37,235 sf 0.00% Impervious Runoff Depth=5.64" Flow Length=379' Tc=10.7 min CN=75 Runoff=4.65 cfs 17,503 cf

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 216 Subcatchment 53S: Basin 9 - Imp Runoff Area=17,461 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=140' Tc=7.4 min CN=98 Runoff=3.12 cfs 12,252 cf Subcatchment 54S: Basin 9 - Perv Runoff Area=8,916 sf 0.00% Impervious Runoff Depth=6.00" Flow Length=140' Tc=7.4 min CN=78 Runoff=1.31 cfs 4,461 cf Pond 21P: Basin 3 Peak Elev=559.42' Storage=876 cf Inflow=3.21 cfs 11,728 cf Discarded=1.21 cfs 10,971 cf Primary=1.15 cfs 756 cf Outflow=2.36 cfs 11,728 cf Pond 22P: Basin 4 Peak Elev=573.49' Storage=7,284 cf Inflow=9.06 cfs 32,597 cf Discarded=1.13 cfs 28,845 cf Primary=0.81 cfs 3,752 cf Outflow=1.94 cfs 32,597 cf Pond 27P: Basin 2 Peak Elev=545.62' Storage=31,128 cf Inflow=17.10 cfs 66,008 cf Outflow=5.38 cfs 56,696 cf Pond 33P: Basin 11 Peak Elev=590.71' Storage=3,818 cf Inflow=13.07 cfs 53,651 cf Discarded=3.13 cfs 44,987 cf Primary=7.54 cfs 8,664 cf Outflow=10.67 cfs 53,651 cf Pond 41P: Basin 10 Peak Elev=576.86' Storage=8,209 cf Inflow=13.17 cfs 54,771 cf Discarded=2.22 cfs 44,788 cf Primary=5.31 cfs 9,983 cf Outflow=7.53 cfs 54,771 cf Pond 42P: Basin 9 Peak Elev=563.59' Storage=4,157 cf Inflow=4.43 cfs 16,713 cf Discarded=0.61 cfs 15,973 cf Primary=0.16 cfs 739 cf Outflow=0.77 cfs 16,713 cf Pond 48P: Basin 8 Peak Elev=574.22' Storage=4,871 cf Inflow=9.79 cfs 38,015 cf Discarded=3.73 cfs 36,926 cf Primary=0.68 cfs 1,089 cf Outflow=4.41 cfs 38,015 cf Pond 49P: Basin 7 Peak Elev=532.81' Storage=28,901 cf Inflow=14.70 cfs 61,976 cf Outflow=3.65 cfs 56,198 cf Link 28L: POA 2 Inflow=38.99 cfs 227,933 cf Primary=38.99 cfs 227,933 cf Link 34L: DA 2 Undetained Inflow=24.70 cfs 95,653 cf Primary=24.70 cfs 95,653 cf Total Runoff Area = 722,187 sf Runoff Volume = 425,513 cf Average Runoff Depth = 7.07" 52.15% Pervious = 376,642 sf 47.85% Impervious = 345,545 sf

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 217 Summary for Subcatchment 19S: Basin 3 - Imp Runoff = 1.19 cfs @ 12.15 hrs, Volume= Routed to Pond 21P : Basin 3 4,788 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 5,876 948 6,824 6,824 * CN 98 98 98 Description Paved parking, HSG C impervious other than pavement Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.3 75 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Sheet Flow (A-B) Subcatchment 19S: Basin 3 - Imp Subcatchment 19S: Basin 3 - Imp Hydrograph Runoff 1.19 cfs Flow (cfs) 1 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=6,824 sf Runoff Volume=4,788 cf Runoff Depth=8.42" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 Time (hours)