complete drainage report rev 9

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 247 Subcatchment 36S: DA 2 Und - Perv Hydrograph Runoff 17 16 15 14 13 12 Flow (cfs) 11 10 9 8 7 6 5 16.02 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=119,952 sf Runoff Volume=58,807 cf Runoff Depth=5.88" Flow Length=160' Tc=9.8 min CN=77 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 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 Hydrograph for Subcatchment 36S: DA 2 Und - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.00 1.60 0.16 0.00 2.40 0.25 0.00 3.20 0.35 0.00 4.00 0.45 0.00 4.80 0.56 0.00 5.60 0.68 0.00 6.40 0.80 0.01 7.20 0.95 0.04 8.00 1.12 0.08 8.80 1.32 0.14 9.60 1.56 0.24 10.40 1.89 0.39 11.20 2.42 0.69 12.00 4.15 1.93 12.80 6.24 3.69 13.60 6.77 4.16 14.40 7.10 4.45 15.20 7.34 4.67 16.00 7.54 4.85 16.80 7.71 5.01 17.60 7.86 5.14 18.40 7.98 5.26 19.20 8.10 5.36 20.00 8.21 5.46 20.80 8.31 5.56 21.60 8.41 5.65 22.40 8.50 5.73 23.20 8.58 5.81 24.00 8.66 5.88 24.80 8.66 5.88 25.60 8.66 5.88 26.40 8.66 5.88 27.20 8.66 5.88 28.00 8.66 5.88 28.80 8.66 5.88 29.60 8.66 5.88 30.40 8.66 5.88 31.20 8.66 5.88 32.00 8.66 5.88 32.80 8.66 5.88 33.60 8.66 5.88 34.40 8.66 5.88 35.20 8.66 5.88 36.00 8.66 5.88 36.80 8.66 5.88 37.60 8.66 5.88 38.40 8.66 5.88 39.20 8.66 5.88 40.00 8.66 5.88 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.05 0.10 0.16 0.24 0.39 0.62 1.34 7.23 2.65 1.30 0.94 0.68 0.60 0.52 0.44 0.38 0.36 0.34 0.32 0.30 0.28 0.27 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

94 0.68 0.60 0.52 0.44 0.38 0.36 0.34 0.32 0.30 0.28 0.27 0.25 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 8.66 5.88 41.60 8.66 5.88 42.40 8.66 5.88 43.20 8.66 5.88 44.00 8.66 5.88 44.80 8.66 5.88 45.60 8.66 5.88 46.40 8.66 5.88 47.20 8.66 5.88 48.00 8.66 5.88 48.80 8.66 5.88 49.60 8.66 5.88 50.40 8.66 5.88 51.20 8.66 5.88 52.00 8.66 5.88 52.80 8.66 5.88 53.60 8.66 5.88 54.40 8.66 5.88 55.20 8.66 5.88 56.00 8.66 5.88 56.80 8.66 5.88 57.60 8.66 5.88 58.40 8.66 5.88 59.20 8.66 5.88 60.00 8.66 5.88 60.80 8.66 5.88 61.60 8.66 5.88 62.40 8.66 5.88 63.20 8.66 5.88 64.00 8.66 5.88 64.80 8.66 5.88 65.60 8.66 5.88 66.40 8.66 5.88 67.20 8.66 5.88 68.00 8.66 5.88 68.80 8.66 5.88 69.60 8.66 5.88 70.40 8.66 5.88 71.20 8.66 5.88 72.00 8.66 5.88 72.80 8.66 5.88 73.60 8.66 5.88 74.40 8.66 5.88 75.20 8.66 5.88 76.00 8.66 5.88 76.80 8.66 5.88 77.60 8.66 5.88 78.40 8.66 5.88 79.20 8.66 5.88 80.00 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 248

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 249 Summary for Subcatchment 45S: Basin 11 - Imp Runoff = 9.90 cfs @ 12.17 hrs, Volume= Routed to Pond 33P : Basin 11 42,030 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) 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 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 250 Subcatchment 45S: Basin 11 - Imp Hydrograph 11 10 9 8 Flow (cfs) 7 6 5 4 3 Runoff 9.90 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=59,901 sf Runoff Volume=42,030 cf Runoff Depth=8.42" Flow Length=233' Tc=9.8 min CN=98 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 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 Hydrograph for Subcatchment 45S: Basin 11 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.01 1.60 0.16 0.05 2.40 0.25 0.11 3.20 0.35 0.19 4.00 0.45 0.28 4.80 0.56 0.38 5.60 0.68 0.48 6.40 0.80 0.60 7.20 0.95 0.74 8.00 1.12 0.91 8.80 1.32 1.10 9.60 1.56 1.34 10.40 1.89 1.67 11.20 2.42 2.19 12.00 4.15 3.91 12.80 6.24 6.00 13.60 6.77 6.53 14.40 7.10 6.86 15.20 7.34 7.10 16.00 7.54 7.30 16.80 7.71 7.47 17.60 7.86 7.62 18.40 7.98 7.74 19.20 8.10 7.86 20.00 8.21 7.97 20.80 8.31 8.07 21.60 8.41 8.17 22.40 8.50 8.26 23.20 8.58 8.34 24.00 8.66 8.42 24.80 8.66 8.42 25.60 8.66 8.42 26.40 8.66 8.42 27.20 8.66 8.42 28.00 8.66 8.42 28.80 8.66 8.42 29.60 8.66 8.42 30.40 8.66 8.42 31.20 8.66 8.42 32.00 8.66 8.42 32.80 8.66 8.42 33.60 8.66 8.42 34.40 8.66 8.42 35.20 8.66 8.42 36.00 8.66 8.42 36.80 8.66 8.42 37.60 8.66 8.42 38.40 8.66 8.42 39.20 8.66 8.42 40.00 8.66 8.42 Runoff (cfs) 0.00 0.03 0.08 0.12 0.14 0.16 0.18 0.19 0.22 0.26 0.30 0.35 0.46 0.61 1.12 4.83 1.51 0.73 0.52 0.37 0.33 0.29 0.24 0.21 0.20 0.19 0.18 0.16 0.15 0.14 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

52 0.37 0.33 0.29 0.24 0.21 0.20 0.19 0.18 0.16 0.15 0.14 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 8.66 8.42 41.60 8.66 8.42 42.40 8.66 8.42 43.20 8.66 8.42 44.00 8.66 8.42 44.80 8.66 8.42 45.60 8.66 8.42 46.40 8.66 8.42 47.20 8.66 8.42 48.00 8.66 8.42 48.80 8.66 8.42 49.60 8.66 8.42 50.40 8.66 8.42 51.20 8.66 8.42 52.00 8.66 8.42 52.80 8.66 8.42 53.60 8.66 8.42 54.40 8.66 8.42 55.20 8.66 8.42 56.00 8.66 8.42 56.80 8.66 8.42 57.60 8.66 8.42 58.40 8.66 8.42 59.20 8.66 8.42 60.00 8.66 8.42 60.80 8.66 8.42 61.60 8.66 8.42 62.40 8.66 8.42 63.20 8.66 8.42 64.00 8.66 8.42 64.80 8.66 8.42 65.60 8.66 8.42 66.40 8.66 8.42 67.20 8.66 8.42 68.00 8.66 8.42 68.80 8.66 8.42 69.60 8.66 8.42 70.40 8.66 8.42 71.20 8.66 8.42 72.00 8.66 8.42 72.80 8.66 8.42 73.60 8.66 8.42 74.40 8.66 8.42 75.20 8.66 8.42 76.00 8.66 8.42 76.80 8.66 8.42 77.60 8.66 8.42 78.40 8.66 8.42 79.20 8.66 8.42 80.00 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 251

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 252 Summary for Subcatchment 46S: Basin 11 - Perv Runoff = 3.18 cfs @ 12.17 hrs, Volume= Routed to Pond 33P : Basin 11 11,621 cf, Depth= 5.76" 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) 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 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 253 Subcatchment 46S: Basin 11 - Perv Hydrograph Runoff 3.18 cfs Flow (cfs) 3 2 1 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=24,202 sf Runoff Volume=11,621 cf Runoff Depth=5.76" Flow Length=233' Tc=9.8 min CN=76 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 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 46S: Basin 11 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.08 0.00 1.60 0.16 0.00 2.40 0.25 0.00 3.20 0.35 0.00 4.00 0.45 0.00 4.80 0.56 0.00 5.60 0.68 0.00 6.40 0.80 0.01 7.20 0.95 0.03 8.00 1.12 0.07 8.80 1.32 0.12 9.60 1.56 0.21 10.40 1.89 0.36 11.20 2.42 0.65 12.00 4.15 1.85 12.80 6.24 3.59 13.60 6.77 4.05 14.40 7.10 4.34 15.20 7.34 4.56 16.00 7.54 4.74 16.80 7.71 4.89 17.60 7.86 5.03 18.40 7.98 5.14 19.20 8.10 5.25 20.00 8.21 5.35 20.80 8.31 5.44 21.60 8.41 5.53 22.40 8.50 5.61 23.20 8.58 5.69 24.00 8.66 5.76 24.80 8.66 5.76 25.60 8.66 5.76 26.40 8.66 5.76 27.20 8.66 5.76 28.00 8.66 5.76 28.80 8.66 5.76 29.60 8.66 5.76 30.40 8.66 5.76 31.20 8.66 5.76 32.00 8.66 5.76 32.80 8.66 5.76 33.60 8.66 5.76 34.40 8.66 5.76 35.20 8.66 5.76 36.00 8.66 5.76 36.80 8.66 5.76 37.60 8.66 5.76 38.40 8.66 5.76 39.20 8.66 5.76 40.00 8.66 5.76 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.07 0.12 0.26 1.42 0.53 0.26 0.19 0.14 0.12 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 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)