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 Printed 10/25/2024 Page 154 Summary for Subcatchment 52S: Basin 10 - Perv Runoff = 2.19 cfs @ 12.18 hrs, Volume= Routed to Pond 41P : Basin 10 8,157 cf, Depth= 2.63" 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) 7,626 29,609 37,235 37,235 CN 80 74 75 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 1.0 210 0.0480 3.53 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 0.7 110 2.50 Direct Entry, Pipe Flow (C-D) 10.7 379 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 52S: - Perv PipeBasin Flow 10 (C-D)

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 155 Subcatchment 52S: Basin 10 - Perv Hydrograph Runoff 2.19 cfs Flow (cfs) 2 1 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=37,235 sf Runoff Volume=8,157 cf Runoff Depth=2.63" Flow Length=379' Tc=10.7 min CN=75 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 52S: Basin 10 - 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 0.00 9.60 0.94 0.02 10.40 1.14 0.06 11.20 1.46 0.15 12.00 2.50 0.65 12.80 3.76 1.49 13.60 4.08 1.73 14.40 4.28 1.88 15.20 4.42 1.99 16.00 4.54 2.08 16.80 4.65 2.17 17.60 4.74 2.24 18.40 4.81 2.30 19.20 4.88 2.35 20.00 4.95 2.41 20.80 5.01 2.46 21.60 5.07 2.50 22.40 5.12 2.55 23.20 5.17 2.59 24.00 5.22 2.63 24.80 5.22 2.63 25.60 5.22 2.63 26.40 5.22 2.63 27.20 5.22 2.63 28.00 5.22 2.63 28.80 5.22 2.63 29.60 5.22 2.63 30.40 5.22 2.63 31.20 5.22 2.63 32.00 5.22 2.63 32.80 5.22 2.63 33.60 5.22 2.63 34.40 5.22 2.63 35.20 5.22 2.63 36.00 5.22 2.63 36.80 5.22 2.63 37.60 5.22 2.63 38.40 5.22 2.63 39.20 5.22 2.63 40.00 5.22 2.63 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 0.05 0.13 0.88 0.42 0.21 0.15 0.11 0.10 0.08 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

15 0.11 0.10 0.08 0.07 0.06 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2.63 41.60 5.22 2.63 42.40 5.22 2.63 43.20 5.22 2.63 44.00 5.22 2.63 44.80 5.22 2.63 45.60 5.22 2.63 46.40 5.22 2.63 47.20 5.22 2.63 48.00 5.22 2.63 48.80 5.22 2.63 49.60 5.22 2.63 50.40 5.22 2.63 51.20 5.22 2.63 52.00 5.22 2.63 52.80 5.22 2.63 53.60 5.22 2.63 54.40 5.22 2.63 55.20 5.22 2.63 56.00 5.22 2.63 56.80 5.22 2.63 57.60 5.22 2.63 58.40 5.22 2.63 59.20 5.22 2.63 60.00 5.22 2.63 60.80 5.22 2.63 61.60 5.22 2.63 62.40 5.22 2.63 63.20 5.22 2.63 64.00 5.22 2.63 64.80 5.22 2.63 65.60 5.22 2.63 66.40 5.22 2.63 67.20 5.22 2.63 68.00 5.22 2.63 68.80 5.22 2.63 69.60 5.22 2.63 70.40 5.22 2.63 71.20 5.22 2.63 72.00 5.22 2.63 72.80 5.22 2.63 73.60 5.22 2.63 74.40 5.22 2.63 75.20 5.22 2.63 76.00 5.22 2.63 76.80 5.22 2.63 77.60 5.22 2.63 78.40 5.22 2.63 79.20 5.22 2.63 80.00 5.22 2.63 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 156

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 157 Summary for Subcatchment 53S: Basin 9 - Imp Runoff = 1.87 cfs @ 12.14 hrs, Volume= Routed to Pond 42P : Basin 9 7,250 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) 13,382 2,932 1,147 17,461 17,461 CN 98 98 98 98 Description vehicle surface area other impervious roofs Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.1000 0.23 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.2 40 0.0750 4.41 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 7.4 140 Total Sheet Flow (A-B) Subcatchment 53S: Basin 9 - Imp SCF (B-C)

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 158 Subcatchment 53S: Basin 9 - Imp Hydrograph Flow (cfs) 2 1 Runoff 1.87 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=17,461 sf Runoff Volume=7,250 cf Runoff Depth=4.98" Flow Length=140' Tc=7.4 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)

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 53S: Basin 9 - 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 0.01 0.02 0.02 0.02 0.03 0.03 0.04 0.04 0.05 0.06 0.08 0.11 0.20 0.99 0.25 0.12 0.09 0.06 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

09 0.06 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.03 0.03 0.03 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 159

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 160 Summary for Subcatchment 54S: Basin 9 - Perv Runoff = 0.65 cfs @ 12.15 hrs, Volume= Routed to Pond 42P : Basin 9 2,154 cf, Depth= 2.90" 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) 2,537 6,379 8,916 8,916 CN 74 80 78 Description >75% Grass cover, Good, HSG C >75% Grass cover, Good, HSG D Weighted Average 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.2 100 0.1000 0.23 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.2 40 0.0750 4.41 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 7.4 140 Total Sheet Flow (A-B) Subcatchment 54S: Basin 9 - Perv SCF (B-C)

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 161 Subcatchment 54S: Basin 9 - Perv Hydrograph Runoff 0.7 0.65 cfs 0.65 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 0.2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=8,916 sf Runoff Volume=2,154 cf Runoff Depth=2.90" Flow Length=140' Tc=7.4 min CN=78 0.15 0.1 0.05 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)