complete drainage report rev 9

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 1B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 89 Summary for Link 25L: POA 1 Inflow Area = Inflow = Primary = 481,833 sf, 51.45% Impervious, Inflow Depth > 2.19" for 10-Year event 5.27 cfs @ 12.15 hrs, Volume= 88,042 cf 5.27 cfs @ 12.15 hrs, Volume= 88,042 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 25L: POA 1 Hydrograph Inflow Primary 5.27 cfs 5.27 cfs Inflow Area=481,833 sf 5 Flow (cfs) 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 Time (hours)

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 90 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 25L: POA 1 Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.08 0.22 2.48 3.84 2.83 2.04 1.55 1.27 1.12 1.01 0.92 0.84 0.77 0.71 0.65 0.49 0.41 0.34 0.29 0.25 0.22 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 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 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.08 0.22 2.48 3.84 2.83 2.04 1.55 1.27 1.12 1.01 0.92 0.84 0.77 0.71 0.65 0.49 0.41 0.34 0.29 0.25 0.22 0.19 0.17 0.15 0.14 0.12 0.11 0.10 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.04 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 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 Primary (cfs) 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 91 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 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 14S: Basin 1 - Imp Runoff Area=147,571 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=1,000' Tc=14.1 min CN=98 Runoff=21.60 cfs 103,543 cf Subcatchment 15S: Basin 1 - Perv Runoff Area=114,590 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=1,000' Tc=14.1 min CN=77 Runoff=13.48 cfs 56,178 cf Runoff Area=43,168 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=98 Runoff=9.01 cfs 30,289 cf Subcatchment 17S: Basin 5 - Imp Runoff Area=56,858 sf 100.00% Impervious Runoff Depth=8.42" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=98 Runoff=11.63 cfs 39,895 cf Subcatchment 22S: Basin 6 - Imp Runoff Area=51,219 sf 0.00% Impervious Runoff Depth=5.52" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=74 Runoff=8.16 cfs 23,561 cf Subcatchment 23S: Basin 6 - Perv Runoff Area=64,687 sf 0.00% Impervious Runoff Depth=5.88" Flow Length=150' Slope=0.1100 '/' Tc=7.1 min CN=77 Runoff=9.65 cfs 31,713 cf Subcatchment 26S: DA 1 Und - Perv Runoff Area=3,440 sf 0.00% Impervious Runoff Depth=5.52" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=74 Runoff=0.57 cfs 1,582 cf Subcatchment 27S: Basin 5 - Perv Subcatchment 28S: undetained impervious Runoff Area=300 sf 100.00% Impervious Runoff Depth=8.42" Tc=0.0 min CN=98 Runoff=0.06 cfs 210 cf Pond 16P: Basin 1 Peak Elev=545.30' Storage=83,095 cf Inflow=41.28 cfs 167,378 cf Outflow=12.27 cfs 150,907 cf Pond 18P: Basin 5 Peak Elev=579.76' Storage=4,513 cf Inflow=9.58 cfs 31,871 cf Discarded=1.37 cfs 26,452 cf Primary=4.67 cfs 5,419 cf Outflow=6.04 cfs 31,871 cf Pond 24P: Basin 6 Peak Elev=600.31' Storage=4,419 cf Inflow=19.78 cfs 63,455 cf Discarded=8.27 cfs 61,217 cf Primary=3.02 cfs 2,238 cf Outflow=11.29 cfs 63,455 cf Link 25L: POA 1 Inflow=14.86 cfs 182,831 cf Primary=14.86 cfs 182,831 cf Total Runoff Area = 481,833 sf Runoff Volume = 286,972 cf Average Runoff Depth = 7.15" 48.55% Pervious = 233,936 sf 51.45% Impervious = 247,897 sf

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 92 Summary for Subcatchment 14S: Basin 1 - Imp Runoff = 21.60 cfs @ 12.21 hrs, Volume= Routed to Pond 16P : Basin 1 103,543 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" * Area (sf) 9,022 28,163 110,386 147,571 147,571 CN 98 98 98 98 Description non parking impervious Paved parking, HSG C Roofs, HSG C Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 59 0.0200 0.11 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.7 425 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 3.4 516 2.50 Direct Entry, Pipe Flow (C-D) 14.1 1,000 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 14S: Basin 1 - Imp Pipe Flow (C-D)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 93 Subcatchment 14S: Basin 1 - Imp Flow (cfs) Hydrograph 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Runoff 21.60 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=147,571 sf Runoff Volume=103,543 cf Runoff Depth=8.42" Flow Length=1,000' Tc=14.1 min CN=98 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 Time (hours)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 Hydrograph for Subcatchment 14S: Basin 1 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.10 0.01 2.00 0.21 0.08 3.00 0.33 0.17 4.00 0.45 0.28 5.00 0.59 0.40 6.00 0.74 0.54 7.00 0.91 0.71 8.00 1.12 0.91 9.00 1.37 1.16 10.00 1.72 1.49 11.00 2.25 2.02 12.00 4.15 3.91 13.00 6.41 6.17 14.00 6.94 6.70 15.00 7.29 7.05 16.00 7.54 7.30 17.00 7.75 7.51 18.00 7.92 7.68 19.00 8.07 7.83 20.00 8.21 7.97 21.00 8.33 8.09 22.00 8.45 8.21 23.00 8.56 8.32 24.00 8.66 8.42 25.00 8.66 8.42 26.00 8.66 8.42 27.00 8.66 8.42 28.00 8.66 8.42 29.00 8.66 8.42 30.00 8.66 8.42 31.00 8.66 8.42 32.00 8.66 8.42 33.00 8.66 8.42 34.00 8.66 8.42 35.00 8.66 8.42 36.00 8.66 8.42 37.00 8.66 8.42 38.00 8.66 8.42 39.00 8.66 8.42 40.00 8.66 8.42 41.00 8.66 8.42 42.00 8.66 8.42 43.00 8.66 8.42 44.00 8.66 8.42 45.00 8.66 8.42 46.00 8.66 8.42 47.00 8.66 8.42 48.00 8.66 8.42 49.00 8.66 8.42 50.00 8.66 8.42 Runoff (cfs) 0.00 0.10 0.25 0.33 0.39 0.44 0.48 0.60 0.74 0.87 1.29 2.17 9.42 3.30 1.51 1.04 0.82 0.69 0.55 0.49 0.46 0.43 0.40 0.36 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 Precip. Excess (hours) (inches) (inches) 51.00 8.66 8.42 52.00 8.66 8.42 53.00 8.66 8.42 54.00 8.66 8.42 55.00 8.66 8.42 56.00 8.66 8.42 57.00 8.66 8.42 58.00 8.66 8.42 59.00 8.66 8.42 60.00 8.66 8.42 61.00 8.66 8.42 62.00 8.66 8.42 63.00 8.66 8.42 64.00 8.66 8.42 65.00 8.66 8.42 66.00 8.66 8.42 67.00 8.66 8.42 68.00 8.66 8.42 69.00 8.66 8.42 70.00 8.66 8.42 71.00 8.66 8.42 72.00 8.66 8.42 Runoff (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 Printed 10/25/2024 Page 94

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 95 Summary for Subcatchment 15S: Basin 1 - Perv Runoff = 13.48 cfs @ 12.22 hrs, Volume= Routed to Pond 16P : Basin 1 56,178 cf, Depth= 5.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 64,900 49,690 114,590 114,590 CN 80 74 77 Description >75% Grass cover, Good, HSG D >75% Grass cover, Good, HSG C Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 59 0.0200 0.11 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.7 425 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 3.4 516 2.50 Direct Entry, Pipe Flow (C-D) 14.1 1,000 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 15S: Basin 1 - Perv Pipe Flow (C-D)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 96 Subcatchment 15S: Basin 1 - Perv Hydrograph 15 Runoff 14 13.48 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=114,590 sf Runoff Volume=56,178 cf Runoff Depth=5.88" Flow Length=1,000' Tc=14.1 min CN=77 13 12 11 Flow (cfs) 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 Time (hours)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 Hydrograph for Subcatchment 15S: Basin 1 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.10 0.00 2.00 0.21 0.00 3.00 0.33 0.00 4.00 0.45 0.00 5.00 0.59 0.00 6.00 0.74 0.01 7.00 0.91 0.03 8.00 1.12 0.08 9.00 1.37 0.16 10.00 1.72 0.31 11.00 2.25 0.59 12.00 4.15 1.93 13.00 6.41 3.84 14.00 6.94 4.31 15.00 7.29 4.62 16.00 7.54 4.85 17.00 7.75 5.04 18.00 7.92 5.20 19.00 8.07 5.34 20.00 8.21 5.46 21.00 8.33 5.58 22.00 8.45 5.69 23.00 8.56 5.79 24.00 8.66 5.88 25.00 8.66 5.88 26.00 8.66 5.88 27.00 8.66 5.88 28.00 8.66 5.88 29.00 8.66 5.88 30.00 8.66 5.88 31.00 8.66 5.88 32.00 8.66 5.88 33.00 8.66 5.88 34.00 8.66 5.88 35.00 8.66 5.88 36.00 8.66 5.88 37.00 8.66 5.88 38.00 8.66 5.88 39.00 8.66 5.88 40.00 8.66 5.88 41.00 8.66 5.88 42.00 8.66 5.88 43.00 8.66 5.88 44.00 8.66 5.88 45.00 8.66 5.88 46.00 8.66 5.88 47.00 8.66 5.88 48.00 8.66 5.88 49.00 8.66 5.88 50.00 8.66 5.88 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.08 0.15 0.24 0.45 0.95 5.36 2.25 1.05 0.73 0.58 0.49 0.39 0.35 0.33 0.31 0.28 0.26 0.24 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 Precip. Excess (hours) (inches) (inches) 51.00 8.66 5.88 52.00 8.66 5.88 53.00 8.66 5.88 54.00 8.66 5.88 55.00 8.66 5.88 56.00 8.66 5.88 57.00 8.66 5.88 58.00 8.66 5.88 59.00 8.66 5.88 60.00 8.66 5.88 61.00 8.66 5.88 62.00 8.66 5.88 63.00 8.66 5.88 64.00 8.66 5.88 65.00 8.66 5.88 66.00 8.66 5.88 67.00 8.66 5.88 68.00 8.66 5.88 69.00 8.66 5.88 70.00 8.66 5.88 71.00 8.66 5.88 72.00 8.66 5.88 Runoff (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 Printed 10/25/2024 Page 97

POA-1 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 1B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 98 Summary for Subcatchment 17S: Basin 5 - Imp Runoff = 9.01 cfs @ 12.10 hrs, Volume= Routed to Pond 18P : Basin 5 30,289 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" * Area (sf) 26,232 14,605 2,331 43,168 43,168 CN 98 98 98 98 Description Roofs, HSG C 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) 0.6 40 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 1.2 182 2.50 Direct Entry, Pipe Flow (B-C) 1.8 222 Total Sheet Flow (A-B) Subcatchment 17S: Basin 5 - Imp Pipe Flow (B-C)