complete drainage report rev 9

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 11 Summary for Subcatchment 15S: Basin 1 - Perv Runoff = 3.18 cfs @ 12.23 hrs, Volume= Routed to Pond 16P : Basin 1 13,236 cf, Depth= 1.39" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) 64,900 49,690 114,590 114,590 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 59 0.0200 0.11 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" Using McCuen-Spiess flow length 1.7 425 0.0650 4.10 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 3.4 516 2.50 Direct Entry, Pipe Flow (C-D) 14.1 1,000 Total Sheet Flow (A-B) SCF (B-C) Subcatchment 15S: Basin 1 - Perv Pipe Flow (C-D)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 12 Subcatchment 15S: Basin 1 - Perv Hydrograph Runoff 3.18 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=114,590 sf Runoff Volume=13,236 cf Runoff Depth=1.39" Flow Length=1,000' Tc=14.1 min CN=77 Flow (cfs) 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 Time (hours)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 15S: Basin 1 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.04 0.00 2.00 0.08 0.00 3.00 0.13 0.00 4.00 0.18 0.00 5.00 0.24 0.00 6.00 0.29 0.00 7.00 0.36 0.00 8.00 0.45 0.00 9.00 0.55 0.00 10.00 0.68 0.00 11.00 0.89 0.03 12.00 1.65 0.27 13.00 2.55 0.77 14.00 2.76 0.91 15.00 2.89 1.00 16.00 2.99 1.07 17.00 3.08 1.13 18.00 3.15 1.17 19.00 3.20 1.22 20.00 3.26 1.25 21.00 3.31 1.29 22.00 3.36 1.33 23.00 3.40 1.36 24.00 3.44 1.39 25.00 3.44 1.39 26.00 3.44 1.39 27.00 3.44 1.39 28.00 3.44 1.39 29.00 3.44 1.39 30.00 3.44 1.39 31.00 3.44 1.39 32.00 3.44 1.39 33.00 3.44 1.39 34.00 3.44 1.39 35.00 3.44 1.39 36.00 3.44 1.39 37.00 3.44 1.39 38.00 3.44 1.39 39.00 3.44 1.39 40.00 3.44 1.39 41.00 3.44 1.39 42.00 3.44 1.39 43.00 3.44 1.39 44.00 3.44 1.39 45.00 3.44 1.39 46.00 3.44 1.39 47.00 3.44 1.39 48.00 3.44 1.39 49.00 3.44 1.39 50.00 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 0.01 0.10 1.04 0.63 0.31 0.22 0.17 0.15 0.12 0.11 0.10 0.10 0.09 0.08 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 51.00 3.44 1.39 52.00 3.44 1.39 53.00 3.44 1.39 54.00 3.44 1.39 55.00 3.44 1.39 56.00 3.44 1.39 57.00 3.44 1.39 58.00 3.44 1.39 59.00 3.44 1.39 60.00 3.44 1.39 61.00 3.44 1.39 62.00 3.44 1.39 63.00 3.44 1.39 64.00 3.44 1.39 65.00 3.44 1.39 66.00 3.44 1.39 67.00 3.44 1.39 68.00 3.44 1.39 69.00 3.44 1.39 70.00 3.44 1.39 71.00 3.44 1.39 72.00 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 Printed 10/25/2024 Page 13

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 14 Summary for Subcatchment 17S: Basin 5 - Imp Runoff = 3.55 cfs @ 12.10 hrs, Volume= Routed to Pond 18P : Basin 5 11,535 cf, Depth= 3.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year Rainfall=3.44" * Area (sf) 26,232 14,605 2,331 43,168 43,168 CN 98 98 98 98 Description Roofs, HSG C Paved parking, HSG C impervious other than pavement Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 40 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 1.2 182 2.50 Direct Entry, Pipe Flow (B-C) 1.8 222 Total Sheet Flow (A-B) Subcatchment 17S: Basin 5 - Imp Pipe Flow (B-C)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 15 Subcatchment 17S: Basin 5 - Imp Hydrograph Runoff 3.55 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=43,168 sf Runoff Volume=11,535 cf Runoff Depth=3.21" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=98 Flow (cfs) 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 Time (hours)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 17S: Basin 5 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.04 0.00 2.00 0.08 0.01 3.00 0.13 0.03 4.00 0.18 0.06 5.00 0.24 0.09 6.00 0.29 0.14 7.00 0.36 0.20 8.00 0.45 0.27 9.00 0.55 0.36 10.00 0.68 0.49 11.00 0.89 0.69 12.00 1.65 1.43 13.00 2.55 2.32 14.00 2.76 2.53 15.00 2.89 2.66 16.00 2.99 2.76 17.00 3.08 2.85 18.00 3.15 2.91 19.00 3.20 2.97 20.00 3.26 3.03 21.00 3.31 3.08 22.00 3.36 3.12 23.00 3.40 3.17 24.00 3.44 3.21 25.00 3.44 3.21 26.00 3.44 3.21 27.00 3.44 3.21 28.00 3.44 3.21 29.00 3.44 3.21 30.00 3.44 3.21 31.00 3.44 3.21 32.00 3.44 3.21 33.00 3.44 3.21 34.00 3.44 3.21 35.00 3.44 3.21 36.00 3.44 3.21 37.00 3.44 3.21 38.00 3.44 3.21 39.00 3.44 3.21 40.00 3.44 3.21 41.00 3.44 3.21 42.00 3.44 3.21 43.00 3.44 3.21 44.00 3.44 3.21 45.00 3.44 3.21 46.00 3.44 3.21 47.00 3.44 3.21 48.00 3.44 3.21 49.00 3.44 3.21 50.00 3.44 3.21 Runoff (cfs) 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.08 0.10 0.15 0.28 2.12 0.32 0.17 0.11 0.09 0.08 0.06 0.06 0.05 0.05 0.05 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 51.00 3.44 3.21 52.00 3.44 3.21 53.00 3.44 3.21 54.00 3.44 3.21 55.00 3.44 3.21 56.00 3.44 3.21 57.00 3.44 3.21 58.00 3.44 3.21 59.00 3.44 3.21 60.00 3.44 3.21 61.00 3.44 3.21 62.00 3.44 3.21 63.00 3.44 3.21 64.00 3.44 3.21 65.00 3.44 3.21 66.00 3.44 3.21 67.00 3.44 3.21 68.00 3.44 3.21 69.00 3.44 3.21 70.00 3.44 3.21 71.00 3.44 3.21 72.00 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 Printed 10/25/2024 Page 16

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 17 Summary for Subcatchment 22S: Basin 6 - Imp Runoff = 4.58 cfs @ 12.11 hrs, Volume= Routed to Pond 24P : Basin 6 15,194 cf, Depth= 3.21" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year Rainfall=3.44" * * Area (sf) 16,127 21,053 4,437 15,241 56,858 56,858 CN 98 98 98 98 98 Description Paved parking, HSG D Paved parking, HSG C impervious non pavement fire lane pervoius pavers Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 40 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 3.0 450 2.50 Direct Entry, Pipe Flow (B-C) 3.6 490 Total Sheet Flow (A-B) Pipe Flow (B-C) Subcatchment 22S: Basin 6 - Imp

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 18 Subcatchment 22S: Basin 6 - Imp Hydrograph Runoff 5 4.58 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=56,858 sf Runoff Volume=15,194 cf Runoff Depth=3.21" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=98 Flow (cfs) 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 Time (hours)

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 22S: Basin 6 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.04 0.00 2.00 0.08 0.01 3.00 0.13 0.03 4.00 0.18 0.06 5.00 0.24 0.09 6.00 0.29 0.14 7.00 0.36 0.20 8.00 0.45 0.27 9.00 0.55 0.36 10.00 0.68 0.49 11.00 0.89 0.69 12.00 1.65 1.43 13.00 2.55 2.32 14.00 2.76 2.53 15.00 2.89 2.66 16.00 2.99 2.76 17.00 3.08 2.85 18.00 3.15 2.91 19.00 3.20 2.97 20.00 3.26 3.03 21.00 3.31 3.08 22.00 3.36 3.12 23.00 3.40 3.17 24.00 3.44 3.21 25.00 3.44 3.21 26.00 3.44 3.21 27.00 3.44 3.21 28.00 3.44 3.21 29.00 3.44 3.21 30.00 3.44 3.21 31.00 3.44 3.21 32.00 3.44 3.21 33.00 3.44 3.21 34.00 3.44 3.21 35.00 3.44 3.21 36.00 3.44 3.21 37.00 3.44 3.21 38.00 3.44 3.21 39.00 3.44 3.21 40.00 3.44 3.21 41.00 3.44 3.21 42.00 3.44 3.21 43.00 3.44 3.21 44.00 3.44 3.21 45.00 3.44 3.21 46.00 3.44 3.21 47.00 3.44 3.21 48.00 3.44 3.21 49.00 3.44 3.21 50.00 3.44 3.21 Runoff (cfs) 0.00 0.00 0.02 0.03 0.04 0.05 0.06 0.08 0.11 0.13 0.20 0.36 2.71 0.43 0.22 0.15 0.12 0.10 0.08 0.07 0.07 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 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 3.44 3.21 52.00 3.44 3.21 53.00 3.44 3.21 54.00 3.44 3.21 55.00 3.44 3.21 56.00 3.44 3.21 57.00 3.44 3.21 58.00 3.44 3.21 59.00 3.44 3.21 60.00 3.44 3.21 61.00 3.44 3.21 62.00 3.44 3.21 63.00 3.44 3.21 64.00 3.44 3.21 65.00 3.44 3.21 66.00 3.44 3.21 67.00 3.44 3.21 68.00 3.44 3.21 69.00 3.44 3.21 70.00 3.44 3.21 71.00 3.44 3.21 72.00 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 Printed 10/25/2024 Page 19

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 20 Summary for Subcatchment 23S: Basin 6 - Perv Runoff = 1.80 cfs @ 12.11 hrs, Volume= Routed to Pond 24P : Basin 6 5,116 cf, Depth= 1.20" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 2-Year Rainfall=3.44" Area (sf) 51,219 51,219 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) 0.6 40 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 3.0 450 2.50 Direct Entry, Pipe Flow (B-C) 3.6 490 Total Sheet Flow (A-B) Pipe Flow (B-C) Subcatchment 23S: Basin 6 - Perv Subcatchment 23S: Basin 6 - Perv Hydrograph 2 Runoff Flow (cfs) 1.80 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=51,219 sf Runoff Volume=5,116 cf Runoff Depth=1.20" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=74 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 Time (hours)