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 Hydrograph for Subcatchment 19S: Basin 3 - 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 0.00 0.01 0.01 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.04 0.05 0.07 0.13 0.61 0.17 0.08 0.06 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)

06 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) (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 218

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 219 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Subcatchment 20S: 15775.6 Runoff = 2.02 cfs @ 12.15 hrs, Volume= Routed to Pond 21P : Basin 3 6,940 cf, Depth= 5.52" 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) 15,086 15,086 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.3 75 0.0400 0.15 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Sheet Flow (A-B) Subcatchment 20S: 15775.6 Subcatchment 20S: 15775.6 Hydrograph Runoff 2.02 cfs Flow (cfs) 2 1 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=15,086 sf Runoff Volume=6,940 cf Runoff Depth=5.52" Flow Length=75' Slope=0.0400 '/' Tc=8.3 min CN=74 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 20S: 15775.6 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 0.00 7.20 0.95 0.02 8.00 1.12 0.05 8.80 1.32 0.09 9.60 1.56 0.17 10.40 1.89 0.30 11.20 2.42 0.57 12.00 4.15 1.71 12.80 6.24 3.39 13.60 6.77 3.84 14.40 7.10 4.13 15.20 7.34 4.34 16.00 7.54 4.51 16.80 7.71 4.67 17.60 7.86 4.80 18.40 7.98 4.91 19.20 8.10 5.01 20.00 8.21 5.11 20.80 8.31 5.20 21.60 8.41 5.29 22.40 8.50 5.37 23.20 8.58 5.45 24.00 8.66 5.52 24.80 8.66 5.52 25.60 8.66 5.52 26.40 8.66 5.52 27.20 8.66 5.52 28.00 8.66 5.52 28.80 8.66 5.52 29.60 8.66 5.52 30.40 8.66 5.52 31.20 8.66 5.52 32.00 8.66 5.52 32.80 8.66 5.52 33.60 8.66 5.52 34.40 8.66 5.52 35.20 8.66 5.52 36.00 8.66 5.52 36.80 8.66 5.52 37.60 8.66 5.52 38.40 8.66 5.52 39.20 8.66 5.52 40.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.02 0.02 0.04 0.07 0.15 0.94 0.31 0.15 0.11 0.08 0.07 0.06 0.05 0.05 0.04 0.04 0.04 0.04 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)

11 0.08 0.07 0.06 0.05 0.05 0.04 0.04 0.04 0.04 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 8.66 5.52 41.60 8.66 5.52 42.40 8.66 5.52 43.20 8.66 5.52 44.00 8.66 5.52 44.80 8.66 5.52 45.60 8.66 5.52 46.40 8.66 5.52 47.20 8.66 5.52 48.00 8.66 5.52 48.80 8.66 5.52 49.60 8.66 5.52 50.40 8.66 5.52 51.20 8.66 5.52 52.00 8.66 5.52 52.80 8.66 5.52 53.60 8.66 5.52 54.40 8.66 5.52 55.20 8.66 5.52 56.00 8.66 5.52 56.80 8.66 5.52 57.60 8.66 5.52 58.40 8.66 5.52 59.20 8.66 5.52 60.00 8.66 5.52 60.80 8.66 5.52 61.60 8.66 5.52 62.40 8.66 5.52 63.20 8.66 5.52 64.00 8.66 5.52 64.80 8.66 5.52 65.60 8.66 5.52 66.40 8.66 5.52 67.20 8.66 5.52 68.00 8.66 5.52 68.80 8.66 5.52 69.60 8.66 5.52 70.40 8.66 5.52 71.20 8.66 5.52 72.00 8.66 5.52 72.80 8.66 5.52 73.60 8.66 5.52 74.40 8.66 5.52 75.20 8.66 5.52 76.00 8.66 5.52 76.80 8.66 5.52 77.60 8.66 5.52 78.40 8.66 5.52 79.20 8.66 5.52 80.00 8.66 5.52 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 220

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 221 Summary for Subcatchment 21S: Basin 4 - Imp Runoff = 7.95 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 29,135 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) 29,022 12,502 41,524 41,524 CN 98 98 98 Description Roofs, HSG D Paved parking, HSG C Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 70 0.0200 1.33 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 4.6 685 2.50 Direct Entry, Pipe Flow (B-C) 5.5 755 Total Sheet Flow (A-B) Pipe Flow (B-C) Subcatchment 21S: Basin 4 - Imp Subcatchment 21S: Basin 4 - Imp Hydrograph Runoff 7.95 cfs 8 7 Flow (cfs) 6 5 4 3 2 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=41,524 sf Runoff Volume=29,135 cf Runoff Depth=8.42" Flow Length=755' Slope=0.0200 '/' Tc=5.5 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 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 21S: Basin 4 - 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 0.06 0.08 0.10 0.11 0.12 0.13 0.15 0.18 0.21 0.24 0.33 0.43 0.83 4.54 0.98 0.47 0.35 0.25 0.22 0.20 0.17 0.14 0.14 0.13 0.12 0.11 0.11 0.10 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

35 0.25 0.22 0.20 0.17 0.14 0.14 0.13 0.12 0.11 0.11 0.10 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 222

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 223 Summary for Subcatchment 24S: Basin 4 - Perv Runoff = 1.11 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 3,462 cf, Depth= 5.52" 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) 7,526 7,526 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.9 70 0.0200 1.33 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 4.6 685 2.50 Direct Entry, Pipe Flow (B-C) 5.5 755 Total Sheet Flow (A-B) Pipe Flow (B-C) Subcatchment 24S: Basin 4 - Perv Subcatchment 24S: Basin 4 - Perv Hydrograph Runoff 1.11 cfs Flow (cfs) 1 NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=7,526 sf Runoff Volume=3,462 cf Runoff Depth=5.52" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=74 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 24S: Basin 4 - 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 0.00 7.20 0.95 0.02 8.00 1.12 0.05 8.80 1.32 0.09 9.60 1.56 0.17 10.40 1.89 0.30 11.20 2.42 0.57 12.00 4.15 1.71 12.80 6.24 3.39 13.60 6.77 3.84 14.40 7.10 4.13 15.20 7.34 4.34 16.00 7.54 4.51 16.80 7.71 4.67 17.60 7.86 4.80 18.40 7.98 4.91 19.20 8.10 5.01 20.00 8.21 5.11 20.80 8.31 5.20 21.60 8.41 5.29 22.40 8.50 5.37 23.20 8.58 5.45 24.00 8.66 5.52 24.80 8.66 5.52 25.60 8.66 5.52 26.40 8.66 5.52 27.20 8.66 5.52 28.00 8.66 5.52 28.80 8.66 5.52 29.60 8.66 5.52 30.40 8.66 5.52 31.20 8.66 5.52 32.00 8.66 5.52 32.80 8.66 5.52 33.60 8.66 5.52 34.40 8.66 5.52 35.20 8.66 5.52 36.00 8.66 5.52 36.80 8.66 5.52 37.60 8.66 5.52 38.40 8.66 5.52 39.20 8.66 5.52 40.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.03 0.08 0.59 0.15 0.07 0.06 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)