complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 39 Subcatchment 36S: DA 2 Und - Perv Hydrograph Runoff 4 Flow (cfs) 3 2 3.80 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=119,952 sf Runoff Volume=13,855 cf Runoff Depth=1.39" Flow Length=160' Tc=9.8 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 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 36S: DA 2 Und - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.03 0.00 1.60 0.06 0.00 2.40 0.10 0.00 3.20 0.14 0.00 4.00 0.18 0.00 4.80 0.22 0.00 5.60 0.27 0.00 6.40 0.32 0.00 7.20 0.38 0.00 8.00 0.45 0.00 8.80 0.52 0.00 9.60 0.62 0.00 10.40 0.75 0.01 11.20 0.96 0.04 12.00 1.65 0.27 12.80 2.48 0.73 13.60 2.69 0.86 14.40 2.82 0.95 15.20 2.92 1.01 16.00 2.99 1.07 16.80 3.06 1.11 17.60 3.12 1.16 18.40 3.17 1.19 19.20 3.22 1.22 20.00 3.26 1.25 20.80 3.30 1.28 21.60 3.34 1.31 22.40 3.38 1.34 23.20 3.41 1.36 24.00 3.44 1.39 24.80 3.44 1.39 25.60 3.44 1.39 26.40 3.44 1.39 27.20 3.44 1.39 28.00 3.44 1.39 28.80 3.44 1.39 29.60 3.44 1.39 30.40 3.44 1.39 31.20 3.44 1.39 32.00 3.44 1.39 32.80 3.44 1.39 33.60 3.44 1.39 34.40 3.44 1.39 35.20 3.44 1.39 36.00 3.44 1.39 36.80 3.44 1.39 37.60 3.44 1.39 38.40 3.44 1.39 39.20 3.44 1.39 40.00 3.44 1.39 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 0.04 0.16 1.46 0.74 0.38 0.28 0.20 0.18 0.16 0.14 0.12 0.11 0.11 0.10 0.10 0.09 0.08 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

28 0.20 0.18 0.16 0.14 0.12 0.11 0.11 0.10 0.10 0.09 0.08 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 3.44 1.39 41.60 3.44 1.39 42.40 3.44 1.39 43.20 3.44 1.39 44.00 3.44 1.39 44.80 3.44 1.39 45.60 3.44 1.39 46.40 3.44 1.39 47.20 3.44 1.39 48.00 3.44 1.39 48.80 3.44 1.39 49.60 3.44 1.39 50.40 3.44 1.39 51.20 3.44 1.39 52.00 3.44 1.39 52.80 3.44 1.39 53.60 3.44 1.39 54.40 3.44 1.39 55.20 3.44 1.39 56.00 3.44 1.39 56.80 3.44 1.39 57.60 3.44 1.39 58.40 3.44 1.39 59.20 3.44 1.39 60.00 3.44 1.39 60.80 3.44 1.39 61.60 3.44 1.39 62.40 3.44 1.39 63.20 3.44 1.39 64.00 3.44 1.39 64.80 3.44 1.39 65.60 3.44 1.39 66.40 3.44 1.39 67.20 3.44 1.39 68.00 3.44 1.39 68.80 3.44 1.39 69.60 3.44 1.39 70.40 3.44 1.39 71.20 3.44 1.39 72.00 3.44 1.39 72.80 3.44 1.39 73.60 3.44 1.39 74.40 3.44 1.39 75.20 3.44 1.39 76.00 3.44 1.39 76.80 3.44 1.39 77.60 3.44 1.39 78.40 3.44 1.39 79.20 3.44 1.39 80.00 3.44 1.39 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 40

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 41 Summary for Subcatchment 45S: Basin 11 - Imp Runoff = 3.89 cfs @ 12.17 hrs, Volume= Routed to Pond 33P : Basin 11 16,007 cf, Depth= 3.21" 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 2-Year Rainfall=3.44" * * Area (sf) 22,270 32,203 5,428 59,901 59,901 CN 98 98 98 98 Description pavement surface area/ porous Roofs, HSG C other impervious 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 0.9 150 0.0330 2.92 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 9.8 233 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 45S: Basin 11 - Imp

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 42 Subcatchment 45S: Basin 11 - Imp Hydrograph Runoff 4 Flow (cfs) 3 2 3.89 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=59,901 sf Runoff Volume=16,007 cf Runoff Depth=3.21" Flow Length=233' Tc=9.8 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 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 45S: Basin 11 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.03 0.00 1.60 0.06 0.00 2.40 0.10 0.01 3.20 0.14 0.03 4.00 0.18 0.06 4.80 0.22 0.09 5.60 0.27 0.12 6.40 0.32 0.16 7.20 0.38 0.21 8.00 0.45 0.27 8.80 0.52 0.34 9.60 0.62 0.43 10.40 0.75 0.55 11.20 0.96 0.75 12.00 1.65 1.43 12.80 2.48 2.25 13.60 2.69 2.46 14.40 2.82 2.59 15.20 2.92 2.68 16.00 2.99 2.76 16.80 3.06 2.83 17.60 3.12 2.89 18.40 3.17 2.94 19.20 3.22 2.98 20.00 3.26 3.03 20.80 3.30 3.07 21.60 3.34 3.11 22.40 3.38 3.14 23.20 3.41 3.18 24.00 3.44 3.21 24.80 3.44 3.21 25.60 3.44 3.21 26.40 3.44 3.21 27.20 3.44 3.21 28.00 3.44 3.21 28.80 3.44 3.21 29.60 3.44 3.21 30.40 3.44 3.21 31.20 3.44 3.21 32.00 3.44 3.21 32.80 3.44 3.21 33.60 3.44 3.21 34.40 3.44 3.21 35.20 3.44 3.21 36.00 3.44 3.21 36.80 3.44 3.21 37.60 3.44 3.21 38.40 3.44 3.21 39.20 3.44 3.21 40.00 3.44 3.21 Runoff (cfs) 0.00 0.00 0.01 0.02 0.04 0.05 0.05 0.06 0.07 0.09 0.11 0.13 0.17 0.23 0.43 1.89 0.60 0.29 0.21 0.15 0.13 0.11 0.10 0.08 0.08 0.07 0.07 0.07 0.06 0.06 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

21 0.15 0.13 0.11 0.10 0.08 0.08 0.07 0.07 0.07 0.06 0.06 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 3.44 3.21 41.60 3.44 3.21 42.40 3.44 3.21 43.20 3.44 3.21 44.00 3.44 3.21 44.80 3.44 3.21 45.60 3.44 3.21 46.40 3.44 3.21 47.20 3.44 3.21 48.00 3.44 3.21 48.80 3.44 3.21 49.60 3.44 3.21 50.40 3.44 3.21 51.20 3.44 3.21 52.00 3.44 3.21 52.80 3.44 3.21 53.60 3.44 3.21 54.40 3.44 3.21 55.20 3.44 3.21 56.00 3.44 3.21 56.80 3.44 3.21 57.60 3.44 3.21 58.40 3.44 3.21 59.20 3.44 3.21 60.00 3.44 3.21 60.80 3.44 3.21 61.60 3.44 3.21 62.40 3.44 3.21 63.20 3.44 3.21 64.00 3.44 3.21 64.80 3.44 3.21 65.60 3.44 3.21 66.40 3.44 3.21 67.20 3.44 3.21 68.00 3.44 3.21 68.80 3.44 3.21 69.60 3.44 3.21 70.40 3.44 3.21 71.20 3.44 3.21 72.00 3.44 3.21 72.80 3.44 3.21 73.60 3.44 3.21 74.40 3.44 3.21 75.20 3.44 3.21 76.00 3.44 3.21 76.80 3.44 3.21 77.60 3.44 3.21 78.40 3.44 3.21 79.20 3.44 3.21 80.00 3.44 3.21 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 43

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 44 Summary for Subcatchment 46S: Basin 11 - Perv Runoff = 0.73 cfs @ 12.18 hrs, Volume= Routed to Pond 33P : Basin 11 2,666 cf, Depth= 1.32" 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 2-Year Rainfall=3.44" Area (sf) 7,658 16,544 24,202 24,202 CN 80 74 76 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 0.9 150 0.0330 2.92 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 9.8 233 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 46S: Basin 11 - Perv

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 45 Subcatchment 46S: Basin 11 - Perv Hydrograph 0.8 0.75 0.7 0.65 0.6 0.55 Flow (cfs) 0.5 0.45 0.4 0.35 0.3 0.25 0.2 Runoff 0.73 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=24,202 sf Runoff Volume=2,666 cf Runoff Depth=1.32" Flow Length=233' Tc=9.8 min CN=76 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)

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Subcatchment 46S: Basin 11 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.03 0.00 1.60 0.06 0.00 2.40 0.10 0.00 3.20 0.14 0.00 4.00 0.18 0.00 4.80 0.22 0.00 5.60 0.27 0.00 6.40 0.32 0.00 7.20 0.38 0.00 8.00 0.45 0.00 8.80 0.52 0.00 9.60 0.62 0.00 10.40 0.75 0.00 11.20 0.96 0.03 12.00 1.65 0.25 12.80 2.48 0.68 13.60 2.69 0.81 14.40 2.82 0.90 15.20 2.92 0.96 16.00 2.99 1.01 16.80 3.06 1.06 17.60 3.12 1.10 18.40 3.17 1.13 19.20 3.22 1.16 20.00 3.26 1.19 20.80 3.30 1.22 21.60 3.34 1.25 22.40 3.38 1.28 23.20 3.41 1.30 24.00 3.44 1.32 24.80 3.44 1.32 25.60 3.44 1.32 26.40 3.44 1.32 27.20 3.44 1.32 28.00 3.44 1.32 28.80 3.44 1.32 29.60 3.44 1.32 30.40 3.44 1.32 31.20 3.44 1.32 32.00 3.44 1.32 32.80 3.44 1.32 33.60 3.44 1.32 34.40 3.44 1.32 35.20 3.44 1.32 36.00 3.44 1.32 36.80 3.44 1.32 37.60 3.44 1.32 38.40 3.44 1.32 39.20 3.44 1.32 40.00 3.44 1.32 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 0.01 0.03 0.28 0.14 0.07 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 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)