complete drainage report rev 9

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) (inches) 40.80 8.66 5.76 41.60 8.66 5.76 42.40 8.66 5.76 43.20 8.66 5.76 44.00 8.66 5.76 44.80 8.66 5.76 45.60 8.66 5.76 46.40 8.66 5.76 47.20 8.66 5.76 48.00 8.66 5.76 48.80 8.66 5.76 49.60 8.66 5.76 50.40 8.66 5.76 51.20 8.66 5.76 52.00 8.66 5.76 52.80 8.66 5.76 53.60 8.66 5.76 54.40 8.66 5.76 55.20 8.66 5.76 56.00 8.66 5.76 56.80 8.66 5.76 57.60 8.66 5.76 58.40 8.66 5.76 59.20 8.66 5.76 60.00 8.66 5.76 60.80 8.66 5.76 61.60 8.66 5.76 62.40 8.66 5.76 63.20 8.66 5.76 64.00 8.66 5.76 64.80 8.66 5.76 65.60 8.66 5.76 66.40 8.66 5.76 67.20 8.66 5.76 68.00 8.66 5.76 68.80 8.66 5.76 69.60 8.66 5.76 70.40 8.66 5.76 71.20 8.66 5.76 72.00 8.66 5.76 72.80 8.66 5.76 73.60 8.66 5.76 74.40 8.66 5.76 75.20 8.66 5.76 76.00 8.66 5.76 76.80 8.66 5.76 77.60 8.66 5.76 78.40 8.66 5.76 79.20 8.66 5.76 80.00 8.66 5.76 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 254

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 255 Summary for Subcatchment 51S: Basin 10 - Imp Runoff = 8.52 cfs @ 12.18 hrs, Volume= Routed to Pond 41P : Basin 10 37,268 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) 15,878 37,236 53,114 53,114 CN 98 98 98 Description 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 1.0 210 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 51S: 10 - Imp PipeBasin Flow (C-D)

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 256 Subcatchment 51S: Basin 10 - Imp Hydrograph Runoff 9 8 7 Flow (cfs) 6 5 4 3 8.52 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=53,114 sf Runoff Volume=37,268 cf Runoff Depth=8.42" Flow Length=379' Tc=10.7 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 51S: Basin 10 - 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 0.02 0.07 0.11 0.13 0.14 0.16 0.17 0.19 0.23 0.27 0.31 0.40 0.54 0.98 4.06 1.37 0.65 0.47 0.33 0.29 0.25 0.22 0.18 0.17 0.17 0.16 0.15 0.14 0.13 0.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

47 0.33 0.29 0.25 0.22 0.18 0.17 0.17 0.16 0.15 0.14 0.13 0.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 257

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 258 Summary for Subcatchment 52S: Basin 10 - Perv Runoff = 4.65 cfs @ 12.18 hrs, Volume= Routed to Pond 41P : Basin 10 17,503 cf, Depth= 5.64" 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) 7,626 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 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 259 Subcatchment 52S: Basin 10 - Perv Hydrograph Runoff 5 4.65 cfs Flow (cfs) 4 3 2 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=37,235 sf Runoff Volume=17,503 cf Runoff Depth=5.64" Flow Length=379' Tc=10.7 min CN=75 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 52S: Basin 10 - 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 0.02 8.00 1.12 0.06 8.80 1.32 0.11 9.60 1.56 0.19 10.40 1.89 0.33 11.20 2.42 0.61 12.00 4.15 1.78 12.80 6.24 3.49 13.60 6.77 3.95 14.40 7.10 4.23 15.20 7.34 4.45 16.00 7.54 4.63 16.80 7.71 4.78 17.60 7.86 4.91 18.40 7.98 5.02 19.20 8.10 5.13 20.00 8.21 5.23 20.80 8.31 5.32 21.60 8.41 5.41 22.40 8.50 5.49 23.20 8.58 5.57 24.00 8.66 5.64 24.80 8.66 5.64 25.60 8.66 5.64 26.40 8.66 5.64 27.20 8.66 5.64 28.00 8.66 5.64 28.80 8.66 5.64 29.60 8.66 5.64 30.40 8.66 5.64 31.20 8.66 5.64 32.00 8.66 5.64 32.80 8.66 5.64 33.60 8.66 5.64 34.40 8.66 5.64 35.20 8.66 5.64 36.00 8.66 5.64 36.80 8.66 5.64 37.60 8.66 5.64 38.40 8.66 5.64 39.20 8.66 5.64 40.00 8.66 5.64 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.04 0.06 0.10 0.17 0.38 2.02 0.82 0.40 0.29 0.21 0.18 0.16 0.14 0.12 0.11 0.10 0.10 0.09 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)

29 0.21 0.18 0.16 0.14 0.12 0.11 0.10 0.10 0.09 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 8.66 5.64 41.60 8.66 5.64 42.40 8.66 5.64 43.20 8.66 5.64 44.00 8.66 5.64 44.80 8.66 5.64 45.60 8.66 5.64 46.40 8.66 5.64 47.20 8.66 5.64 48.00 8.66 5.64 48.80 8.66 5.64 49.60 8.66 5.64 50.40 8.66 5.64 51.20 8.66 5.64 52.00 8.66 5.64 52.80 8.66 5.64 53.60 8.66 5.64 54.40 8.66 5.64 55.20 8.66 5.64 56.00 8.66 5.64 56.80 8.66 5.64 57.60 8.66 5.64 58.40 8.66 5.64 59.20 8.66 5.64 60.00 8.66 5.64 60.80 8.66 5.64 61.60 8.66 5.64 62.40 8.66 5.64 63.20 8.66 5.64 64.00 8.66 5.64 64.80 8.66 5.64 65.60 8.66 5.64 66.40 8.66 5.64 67.20 8.66 5.64 68.00 8.66 5.64 68.80 8.66 5.64 69.60 8.66 5.64 70.40 8.66 5.64 71.20 8.66 5.64 72.00 8.66 5.64 72.80 8.66 5.64 73.60 8.66 5.64 74.40 8.66 5.64 75.20 8.66 5.64 76.00 8.66 5.64 76.80 8.66 5.64 77.60 8.66 5.64 78.40 8.66 5.64 79.20 8.66 5.64 80.00 8.66 5.64 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 260

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 261 Summary for Subcatchment 53S: Basin 9 - Imp Runoff = 3.12 cfs @ 12.14 hrs, Volume= Routed to Pond 42P : Basin 9 12,252 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) 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)