complete drainage report rev 9

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 Hydrograph for Subcatchment 30S: Basin 8 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.00 2.40 0.15 0.00 3.20 0.21 0.00 4.00 0.27 0.00 4.80 0.34 0.00 5.60 0.41 0.00 6.40 0.48 0.00 7.20 0.57 0.00 8.00 0.68 0.00 8.80 0.80 0.01 9.60 0.94 0.04 10.40 1.14 0.08 11.20 1.46 0.19 12.00 2.50 0.74 12.80 3.76 1.63 13.60 4.08 1.87 14.40 4.28 2.03 15.20 4.42 2.15 16.00 4.54 2.25 16.80 4.65 2.33 17.60 4.74 2.40 18.40 4.81 2.47 19.20 4.88 2.52 20.00 4.95 2.58 20.80 5.01 2.63 21.60 5.07 2.68 22.40 5.12 2.73 23.20 5.17 2.77 24.00 5.22 2.81 24.80 5.22 2.81 25.60 5.22 2.81 26.40 5.22 2.81 27.20 5.22 2.81 28.00 5.22 2.81 28.80 5.22 2.81 29.60 5.22 2.81 30.40 5.22 2.81 31.20 5.22 2.81 32.00 5.22 2.81 32.80 5.22 2.81 33.60 5.22 2.81 34.40 5.22 2.81 35.20 5.22 2.81 36.00 5.22 2.81 36.80 5.22 2.81 37.60 5.22 2.81 38.40 5.22 2.81 39.20 5.22 2.81 40.00 5.22 2.81 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.04 0.10 0.68 0.26 0.13 0.10 0.07 0.06 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

10 0.07 0.06 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 40.80 5.22 2.81 41.60 5.22 2.81 42.40 5.22 2.81 43.20 5.22 2.81 44.00 5.22 2.81 44.80 5.22 2.81 45.60 5.22 2.81 46.40 5.22 2.81 47.20 5.22 2.81 48.00 5.22 2.81 48.80 5.22 2.81 49.60 5.22 2.81 50.40 5.22 2.81 51.20 5.22 2.81 52.00 5.22 2.81 52.80 5.22 2.81 53.60 5.22 2.81 54.40 5.22 2.81 55.20 5.22 2.81 56.00 5.22 2.81 56.80 5.22 2.81 57.60 5.22 2.81 58.40 5.22 2.81 59.20 5.22 2.81 60.00 5.22 2.81 60.80 5.22 2.81 61.60 5.22 2.81 62.40 5.22 2.81 63.20 5.22 2.81 64.00 5.22 2.81 64.80 5.22 2.81 65.60 5.22 2.81 66.40 5.22 2.81 67.20 5.22 2.81 68.00 5.22 2.81 68.80 5.22 2.81 69.60 5.22 2.81 70.40 5.22 2.81 71.20 5.22 2.81 72.00 5.22 2.81 72.80 5.22 2.81 73.60 5.22 2.81 74.40 5.22 2.81 75.20 5.22 2.81 76.00 5.22 2.81 76.80 5.22 2.81 77.60 5.22 2.81 78.40 5.22 2.81 79.20 5.22 2.81 80.00 5.22 2.81 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 132

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 133 Summary for Subcatchment 31S: Basin 7 - Imp Runoff = 4.18 cfs @ 12.20 hrs, Volume= Routed to Pond 49P : Basin 7 19,009 cf, Depth= 4.98" 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 10-Year Rainfall=5.22" * * Area (sf) 6,730 39,048 45,778 45,778 CN 98 98 98 Description other impervious vehicle pavement surface Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.9 83 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.1 272 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 0.1 40 0.0670 5.25 Shallow Concentrated Flow, SCF (C-D) Paved Kv= 20.3 fps 2.4 365 2.50 Direct Entry, Pipe Flow 12.5 760 Total Sheet Flow (A-B) SCF (B-C) SCF (C-D) Subcatchment 31S: Basin 7 - Imp Pipe Flow

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 134 Subcatchment 31S: Basin 7 - Imp Hydrograph Runoff 4.18 cfs 4 Flow (cfs) 3 2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=45,778 sf Runoff Volume=19,009 cf Runoff Depth=4.98" Flow Length=760' Tc=12.5 min CN=98 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 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 Hydrograph for Subcatchment 31S: Basin 7 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.01 2.40 0.15 0.04 3.20 0.21 0.08 4.00 0.27 0.12 4.80 0.34 0.18 5.60 0.41 0.24 6.40 0.48 0.30 7.20 0.57 0.39 8.00 0.68 0.48 8.80 0.80 0.59 9.60 0.94 0.74 10.40 1.14 0.93 11.20 1.46 1.24 12.00 2.50 2.27 12.80 3.76 3.53 13.60 4.08 3.84 14.40 4.28 4.04 15.20 4.42 4.19 16.00 4.54 4.31 16.80 4.65 4.41 17.60 4.74 4.50 18.40 4.81 4.57 19.20 4.88 4.64 20.00 4.95 4.71 20.80 5.01 4.77 21.60 5.07 4.83 22.40 5.12 4.88 23.20 5.17 4.94 24.00 5.22 4.98 24.80 5.22 4.98 25.60 5.22 4.98 26.40 5.22 4.98 27.20 5.22 4.98 28.00 5.22 4.98 28.80 5.22 4.98 29.60 5.22 4.98 30.40 5.22 4.98 31.20 5.22 4.98 32.00 5.22 4.98 32.80 5.22 4.98 33.60 5.22 4.98 34.40 5.22 4.98 35.20 5.22 4.98 36.00 5.22 4.98 36.80 5.22 4.98 37.60 5.22 4.98 38.40 5.22 4.98 39.20 5.22 4.98 40.00 5.22 4.98 Runoff (cfs) 0.00 0.00 0.02 0.04 0.05 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.20 0.27 0.49 1.90 0.74 0.35 0.24 0.18 0.15 0.13 0.11 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

24 0.18 0.15 0.13 0.11 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 40.80 5.22 4.98 41.60 5.22 4.98 42.40 5.22 4.98 43.20 5.22 4.98 44.00 5.22 4.98 44.80 5.22 4.98 45.60 5.22 4.98 46.40 5.22 4.98 47.20 5.22 4.98 48.00 5.22 4.98 48.80 5.22 4.98 49.60 5.22 4.98 50.40 5.22 4.98 51.20 5.22 4.98 52.00 5.22 4.98 52.80 5.22 4.98 53.60 5.22 4.98 54.40 5.22 4.98 55.20 5.22 4.98 56.00 5.22 4.98 56.80 5.22 4.98 57.60 5.22 4.98 58.40 5.22 4.98 59.20 5.22 4.98 60.00 5.22 4.98 60.80 5.22 4.98 61.60 5.22 4.98 62.40 5.22 4.98 63.20 5.22 4.98 64.00 5.22 4.98 64.80 5.22 4.98 65.60 5.22 4.98 66.40 5.22 4.98 67.20 5.22 4.98 68.00 5.22 4.98 68.80 5.22 4.98 69.60 5.22 4.98 70.40 5.22 4.98 71.20 5.22 4.98 72.00 5.22 4.98 72.80 5.22 4.98 73.60 5.22 4.98 74.40 5.22 4.98 75.20 5.22 4.98 76.00 5.22 4.98 76.80 5.22 4.98 77.60 5.22 4.98 78.40 5.22 4.98 79.20 5.22 4.98 80.00 5.22 4.98 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 135

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 136 Summary for Subcatchment 32S: Basin 7 - Perv Runoff = 3.49 cfs @ 12.20 hrs, Volume= Routed to Pond 49P : Basin 7 13,731 cf, Depth= 2.81" 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 10-Year Rainfall=5.22" Area (sf) 25,517 33,161 58,678 58,678 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) 8.9 83 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.1 272 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 0.1 40 0.0670 5.25 Shallow Concentrated Flow, SCF (C-D) Paved Kv= 20.3 fps 2.4 365 2.50 Direct Entry, Pipe Flow 12.5 760 Total Sheet Flow (A-B) SCF (B-C) SCF (C-D) Subcatchment 32S: Basin 7 - Perv Pipe Flow

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 137 Subcatchment 32S: Basin 7 - Perv Hydrograph Runoff 3.49 cfs Flow (cfs) 3 2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=58,678 sf Runoff Volume=13,731 cf Runoff Depth=2.81" Flow Length=760' Tc=12.5 min CN=77 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 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 Hydrograph for Subcatchment 32S: Basin 7 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.00 2.40 0.15 0.00 3.20 0.21 0.00 4.00 0.27 0.00 4.80 0.34 0.00 5.60 0.41 0.00 6.40 0.48 0.00 7.20 0.57 0.00 8.00 0.68 0.00 8.80 0.80 0.01 9.60 0.94 0.04 10.40 1.14 0.08 11.20 1.46 0.19 12.00 2.50 0.74 12.80 3.76 1.63 13.60 4.08 1.87 14.40 4.28 2.03 15.20 4.42 2.15 16.00 4.54 2.25 16.80 4.65 2.33 17.60 4.74 2.40 18.40 4.81 2.47 19.20 4.88 2.52 20.00 4.95 2.58 20.80 5.01 2.63 21.60 5.07 2.68 22.40 5.12 2.73 23.20 5.17 2.77 24.00 5.22 2.81 24.80 5.22 2.81 25.60 5.22 2.81 26.40 5.22 2.81 27.20 5.22 2.81 28.00 5.22 2.81 28.80 5.22 2.81 29.60 5.22 2.81 30.40 5.22 2.81 31.20 5.22 2.81 32.00 5.22 2.81 32.80 5.22 2.81 33.60 5.22 2.81 34.40 5.22 2.81 35.20 5.22 2.81 36.00 5.22 2.81 36.80 5.22 2.81 37.60 5.22 2.81 38.40 5.22 2.81 39.20 5.22 2.81 40.00 5.22 2.81 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.05 0.09 0.23 1.35 0.71 0.35 0.25 0.18 0.16 0.14 0.12 0.10 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

25 0.18 0.16 0.14 0.12 0.10 0.10 0.09 0.09 0.08 0.08 0.07 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 40.80 5.22 2.81 41.60 5.22 2.81 42.40 5.22 2.81 43.20 5.22 2.81 44.00 5.22 2.81 44.80 5.22 2.81 45.60 5.22 2.81 46.40 5.22 2.81 47.20 5.22 2.81 48.00 5.22 2.81 48.80 5.22 2.81 49.60 5.22 2.81 50.40 5.22 2.81 51.20 5.22 2.81 52.00 5.22 2.81 52.80 5.22 2.81 53.60 5.22 2.81 54.40 5.22 2.81 55.20 5.22 2.81 56.00 5.22 2.81 56.80 5.22 2.81 57.60 5.22 2.81 58.40 5.22 2.81 59.20 5.22 2.81 60.00 5.22 2.81 60.80 5.22 2.81 61.60 5.22 2.81 62.40 5.22 2.81 63.20 5.22 2.81 64.00 5.22 2.81 64.80 5.22 2.81 65.60 5.22 2.81 66.40 5.22 2.81 67.20 5.22 2.81 68.00 5.22 2.81 68.80 5.22 2.81 69.60 5.22 2.81 70.40 5.22 2.81 71.20 5.22 2.81 72.00 5.22 2.81 72.80 5.22 2.81 73.60 5.22 2.81 74.40 5.22 2.81 75.20 5.22 2.81 76.00 5.22 2.81 76.80 5.22 2.81 77.60 5.22 2.81 78.40 5.22 2.81 79.20 5.22 2.81 80.00 5.22 2.81 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 138