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 117 Summary for Subcatchment 21S: Basin 4 - Imp Runoff = 4.78 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 17,242 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) 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 5 Flow (cfs) 4 3 2 1 4.78 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=41,524 sf Runoff Volume=17,242 cf Runoff Depth=4.98" Flow Length=755' Slope=0.0200 '/' Tc=5.5 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 21S: Basin 4 - 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 0.02 0.04 0.05 0.06 0.07 0.07 0.09 0.11 0.12 0.14 0.19 0.26 0.50 2.72 0.59 0.28 0.21 0.15 0.14 0.12 0.10 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.14 0.12 0.10 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 118

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 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 119 Summary for Subcatchment 24S: Basin 4 - Perv Runoff = 0.52 cfs @ 12.12 hrs, Volume= Routed to Pond 22P : Basin 4 1,594 cf, Depth= 2.54" 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) 7,526 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 0.55 0.5 0.45 0.4 Flow (cfs) 0.35 0.3 0.25 0.2 0.15 0.1 0.52 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=7,526 sf Runoff Volume=1,594 cf Runoff Depth=2.54" Flow Length=755' Slope=0.0200 '/' Tc=5.5 min CN=74 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 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 24S: Basin 4 - 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 0.05 11.20 1.46 0.13 12.00 2.50 0.61 12.80 3.76 1.42 13.60 4.08 1.65 14.40 4.28 1.80 15.20 4.42 1.91 16.00 4.54 2.01 16.80 4.65 2.09 17.60 4.74 2.16 18.40 4.81 2.21 19.20 4.88 2.27 20.00 4.95 2.32 20.80 5.01 2.37 21.60 5.07 2.42 22.40 5.12 2.46 23.20 5.17 2.50 24.00 5.22 2.54 24.80 5.22 2.54 25.60 5.22 2.54 26.40 5.22 2.54 27.20 5.22 2.54 28.00 5.22 2.54 28.80 5.22 2.54 29.60 5.22 2.54 30.40 5.22 2.54 31.20 5.22 2.54 32.00 5.22 2.54 32.80 5.22 2.54 33.60 5.22 2.54 34.40 5.22 2.54 35.20 5.22 2.54 36.00 5.22 2.54 36.80 5.22 2.54 37.60 5.22 2.54 38.40 5.22 2.54 39.20 5.22 2.54 40.00 5.22 2.54 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 0.26 0.08 0.04 0.03 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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)

03 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2.54 41.60 5.22 2.54 42.40 5.22 2.54 43.20 5.22 2.54 44.00 5.22 2.54 44.80 5.22 2.54 45.60 5.22 2.54 46.40 5.22 2.54 47.20 5.22 2.54 48.00 5.22 2.54 48.80 5.22 2.54 49.60 5.22 2.54 50.40 5.22 2.54 51.20 5.22 2.54 52.00 5.22 2.54 52.80 5.22 2.54 53.60 5.22 2.54 54.40 5.22 2.54 55.20 5.22 2.54 56.00 5.22 2.54 56.80 5.22 2.54 57.60 5.22 2.54 58.40 5.22 2.54 59.20 5.22 2.54 60.00 5.22 2.54 60.80 5.22 2.54 61.60 5.22 2.54 62.40 5.22 2.54 63.20 5.22 2.54 64.00 5.22 2.54 64.80 5.22 2.54 65.60 5.22 2.54 66.40 5.22 2.54 67.20 5.22 2.54 68.00 5.22 2.54 68.80 5.22 2.54 69.60 5.22 2.54 70.40 5.22 2.54 71.20 5.22 2.54 72.00 5.22 2.54 72.80 5.22 2.54 73.60 5.22 2.54 74.40 5.22 2.54 75.20 5.22 2.54 76.00 5.22 2.54 76.80 5.22 2.54 77.60 5.22 2.54 78.40 5.22 2.54 79.20 5.22 2.54 80.00 5.22 2.54 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 120

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 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 121 Summary for Subcatchment 25S: Basin 2 - Perv Runoff = 5.19 cfs @ 12.18 hrs, Volume= Routed to Pond 27P : Basin 2 19,249 cf, Depth= 2.81" 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) 47,097 35,163 82,260 82,260 CN 80 74 77 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 93 0.0500 0.17 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.5 370 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 10.5 463 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 25S: Basin 2 - Perv

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 122 Subcatchment 25S: Basin 2 - Perv Hydrograph Runoff 5.19 cfs 5 Flow (cfs) 4 3 2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=82,260 sf Runoff Volume=19,249 cf Runoff Depth=2.81" Flow Length=463' Tc=10.5 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 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 25S: Basin 2 - 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 0.01 9.60 0.94 0.04 10.40 1.14 0.08 11.20 1.46 0.19 12.00 2.50 0.74 12.80 3.76 1.63 13.60 4.08 1.87 14.40 4.28 2.03 15.20 4.42 2.15 16.00 4.54 2.25 16.80 4.65 2.33 17.60 4.74 2.40 18.40 4.81 2.47 19.20 4.88 2.52 20.00 4.95 2.58 20.80 5.01 2.63 21.60 5.07 2.68 22.40 5.12 2.73 23.20 5.17 2.77 24.00 5.22 2.81 24.80 5.22 2.81 25.60 5.22 2.81 26.40 5.22 2.81 27.20 5.22 2.81 28.00 5.22 2.81 28.80 5.22 2.81 29.60 5.22 2.81 30.40 5.22 2.81 31.20 5.22 2.81 32.00 5.22 2.81 32.80 5.22 2.81 33.60 5.22 2.81 34.40 5.22 2.81 35.20 5.22 2.81 36.00 5.22 2.81 36.80 5.22 2.81 37.60 5.22 2.81 38.40 5.22 2.81 39.20 5.22 2.81 40.00 5.22 2.81 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.07 0.14 0.34 2.14 0.96 0.48 0.35 0.25 0.22 0.19 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 0.19 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 5.22 2.81 41.60 5.22 2.81 42.40 5.22 2.81 43.20 5.22 2.81 44.00 5.22 2.81 44.80 5.22 2.81 45.60 5.22 2.81 46.40 5.22 2.81 47.20 5.22 2.81 48.00 5.22 2.81 48.80 5.22 2.81 49.60 5.22 2.81 50.40 5.22 2.81 51.20 5.22 2.81 52.00 5.22 2.81 52.80 5.22 2.81 53.60 5.22 2.81 54.40 5.22 2.81 55.20 5.22 2.81 56.00 5.22 2.81 56.80 5.22 2.81 57.60 5.22 2.81 58.40 5.22 2.81 59.20 5.22 2.81 60.00 5.22 2.81 60.80 5.22 2.81 61.60 5.22 2.81 62.40 5.22 2.81 63.20 5.22 2.81 64.00 5.22 2.81 64.80 5.22 2.81 65.60 5.22 2.81 66.40 5.22 2.81 67.20 5.22 2.81 68.00 5.22 2.81 68.80 5.22 2.81 69.60 5.22 2.81 70.40 5.22 2.81 71.20 5.22 2.81 72.00 5.22 2.81 72.80 5.22 2.81 73.60 5.22 2.81 74.40 5.22 2.81 75.20 5.22 2.81 76.00 5.22 2.81 76.80 5.22 2.81 77.60 5.22 2.81 78.40 5.22 2.81 79.20 5.22 2.81 80.00 5.22 2.81 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 123