complete drainage report rev 9

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 60 Subcatchment 22S: Basin 6 - Imp Hydrograph Runoff 6.99 cfs 7 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=56,858 sf Runoff Volume=23,610 cf Runoff Depth=4.98" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=98 6 Flow (cfs) 5 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 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 22S: Basin 6 - Imp Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.02 3.00 0.20 0.07 4.00 0.27 0.12 5.00 0.36 0.19 6.00 0.45 0.27 7.00 0.55 0.36 8.00 0.68 0.48 9.00 0.83 0.63 10.00 1.03 0.82 11.00 1.36 1.14 12.00 2.50 2.27 13.00 3.86 3.63 14.00 4.19 3.95 15.00 4.39 4.16 16.00 4.54 4.31 17.00 4.67 4.43 18.00 4.77 4.54 19.00 4.86 4.63 20.00 4.95 4.71 21.00 5.02 4.79 22.00 5.09 4.86 23.00 5.16 4.92 24.00 5.22 4.98 25.00 5.22 4.98 26.00 5.22 4.98 27.00 5.22 4.98 28.00 5.22 4.98 29.00 5.22 4.98 30.00 5.22 4.98 31.00 5.22 4.98 32.00 5.22 4.98 33.00 5.22 4.98 34.00 5.22 4.98 35.00 5.22 4.98 36.00 5.22 4.98 37.00 5.22 4.98 38.00 5.22 4.98 39.00 5.22 4.98 40.00 5.22 4.98 41.00 5.22 4.98 42.00 5.22 4.98 43.00 5.22 4.98 44.00 5.22 4.98 45.00 5.22 4.98 46.00 5.22 4.98 47.00 5.22 4.98 48.00 5.22 4.98 49.00 5.22 4.98 50.00 5.22 4.98 Runoff (cfs) 0.00 0.01 0.04 0.07 0.08 0.09 0.11 0.14 0.17 0.20 0.31 0.56 4.15 0.65 0.33 0.22 0.18 0.15 0.12 0.11 0.11 0.10 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 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 5.22 4.98 52.00 5.22 4.98 53.00 5.22 4.98 54.00 5.22 4.98 55.00 5.22 4.98 56.00 5.22 4.98 57.00 5.22 4.98 58.00 5.22 4.98 59.00 5.22 4.98 60.00 5.22 4.98 61.00 5.22 4.98 62.00 5.22 4.98 63.00 5.22 4.98 64.00 5.22 4.98 65.00 5.22 4.98 66.00 5.22 4.98 67.00 5.22 4.98 68.00 5.22 4.98 69.00 5.22 4.98 70.00 5.22 4.98 71.00 5.22 4.98 72.00 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 Printed 10/25/2024 Page 61

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 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 62 Summary for Subcatchment 23S: Basin 6 - Perv Runoff = 3.84 cfs @ 12.11 hrs, Volume= Routed to Pond 24P : Basin 6 10,845 cf, Depth= 2.54" 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 10-Year Rainfall=5.22" 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 Runoff 4 3.84 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=51,219 sf Runoff Volume=10,845 cf Runoff Depth=2.54" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=74 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 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 23S: Basin 6 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.03 11.00 1.36 0.10 12.00 2.50 0.61 13.00 3.86 1.50 14.00 4.19 1.73 15.00 4.39 1.89 16.00 4.54 2.01 17.00 4.67 2.10 18.00 4.77 2.19 19.00 4.86 2.26 20.00 4.95 2.32 21.00 5.02 2.38 22.00 5.09 2.44 23.00 5.16 2.49 24.00 5.22 2.54 25.00 5.22 2.54 26.00 5.22 2.54 27.00 5.22 2.54 28.00 5.22 2.54 29.00 5.22 2.54 30.00 5.22 2.54 31.00 5.22 2.54 32.00 5.22 2.54 33.00 5.22 2.54 34.00 5.22 2.54 35.00 5.22 2.54 36.00 5.22 2.54 37.00 5.22 2.54 38.00 5.22 2.54 39.00 5.22 2.54 40.00 5.22 2.54 41.00 5.22 2.54 42.00 5.22 2.54 43.00 5.22 2.54 44.00 5.22 2.54 45.00 5.22 2.54 46.00 5.22 2.54 47.00 5.22 2.54 48.00 5.22 2.54 49.00 5.22 2.54 50.00 5.22 2.54 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.05 0.14 2.00 0.42 0.22 0.15 0.13 0.11 0.09 0.08 0.08 0.07 0.07 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 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 5.22 2.54 52.00 5.22 2.54 53.00 5.22 2.54 54.00 5.22 2.54 55.00 5.22 2.54 56.00 5.22 2.54 57.00 5.22 2.54 58.00 5.22 2.54 59.00 5.22 2.54 60.00 5.22 2.54 61.00 5.22 2.54 62.00 5.22 2.54 63.00 5.22 2.54 64.00 5.22 2.54 65.00 5.22 2.54 66.00 5.22 2.54 67.00 5.22 2.54 68.00 5.22 2.54 69.00 5.22 2.54 70.00 5.22 2.54 71.00 5.22 2.54 72.00 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 Printed 10/25/2024 Page 63

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 64 Summary for Subcatchment 26S: DA 1 Und - Perv Runoff = 4.71 cfs @ 12.14 hrs, Volume= Routed to Link 25L : POA 1 15,137 cf, Depth= 2.81" 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 10-Year Rainfall=5.22" Area (sf) 31,523 33,164 64,687 64,687 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) 6.9 100 0.1100 0.24 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.2 50 0.1100 5.34 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 7.1 150 Total Sheet Flow (A-B) Subcatchment 26S: DA(B-C) 1 Und - Perv SCF

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 65 Subcatchment 26S: DA 1 Und - Perv Hydrograph Runoff 5 4.71 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=64,687 sf Runoff Volume=15,137 cf Runoff Depth=2.81" Flow Length=150' Slope=0.1100 '/' Tc=7.1 min CN=77 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 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 26S: DA 1 Und - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.02 10.00 1.03 0.06 11.00 1.36 0.15 12.00 2.50 0.74 13.00 3.86 1.71 14.00 4.19 1.96 15.00 4.39 2.12 16.00 4.54 2.25 17.00 4.67 2.35 18.00 4.77 2.44 19.00 4.86 2.51 20.00 4.95 2.58 21.00 5.02 2.64 22.00 5.09 2.70 23.00 5.16 2.76 24.00 5.22 2.81 25.00 5.22 2.81 26.00 5.22 2.81 27.00 5.22 2.81 28.00 5.22 2.81 29.00 5.22 2.81 30.00 5.22 2.81 31.00 5.22 2.81 32.00 5.22 2.81 33.00 5.22 2.81 34.00 5.22 2.81 35.00 5.22 2.81 36.00 5.22 2.81 37.00 5.22 2.81 38.00 5.22 2.81 39.00 5.22 2.81 40.00 5.22 2.81 41.00 5.22 2.81 42.00 5.22 2.81 43.00 5.22 2.81 44.00 5.22 2.81 45.00 5.22 2.81 46.00 5.22 2.81 47.00 5.22 2.81 48.00 5.22 2.81 49.00 5.22 2.81 50.00 5.22 2.81 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.08 0.22 2.19 0.60 0.30 0.21 0.17 0.15 0.12 0.11 0.10 0.09 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 5.22 2.81 52.00 5.22 2.81 53.00 5.22 2.81 54.00 5.22 2.81 55.00 5.22 2.81 56.00 5.22 2.81 57.00 5.22 2.81 58.00 5.22 2.81 59.00 5.22 2.81 60.00 5.22 2.81 61.00 5.22 2.81 62.00 5.22 2.81 63.00 5.22 2.81 64.00 5.22 2.81 65.00 5.22 2.81 66.00 5.22 2.81 67.00 5.22 2.81 68.00 5.22 2.81 69.00 5.22 2.81 70.00 5.22 2.81 71.00 5.22 2.81 72.00 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 Printed 10/25/2024 Page 66

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 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 67 Summary for Subcatchment 27S: Basin 5 - Perv Runoff = 0.27 cfs @ 12.10 hrs, Volume= Routed to Pond 18P : Basin 5 728 cf, Depth= 2.54" 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 10-Year Rainfall=5.22" Area (sf) 3,440 3,440 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" 1.2 182 2.50 Direct Entry, Pipe Flow (B-C) 1.8 222 Total Sheet Flow (A-B) Subcatchment 27S: Basin 5 - Perv Pipe Flow (B-C) Subcatchment 27S: Basin 5 - Perv Hydrograph 0.3 Runoff 0.28 0.27 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=3,440 sf Runoff Volume=728 cf Runoff Depth=2.54" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=74 0.26 0.24 0.22 Flow (cfs) 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 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 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 27S: Basin 5 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.00 3.00 0.20 0.00 4.00 0.27 0.00 5.00 0.36 0.00 6.00 0.45 0.00 7.00 0.55 0.00 8.00 0.68 0.00 9.00 0.83 0.00 10.00 1.03 0.03 11.00 1.36 0.10 12.00 2.50 0.61 13.00 3.86 1.50 14.00 4.19 1.73 15.00 4.39 1.89 16.00 4.54 2.01 17.00 4.67 2.10 18.00 4.77 2.19 19.00 4.86 2.26 20.00 4.95 2.32 21.00 5.02 2.38 22.00 5.09 2.44 23.00 5.16 2.49 24.00 5.22 2.54 25.00 5.22 2.54 26.00 5.22 2.54 27.00 5.22 2.54 28.00 5.22 2.54 29.00 5.22 2.54 30.00 5.22 2.54 31.00 5.22 2.54 32.00 5.22 2.54 33.00 5.22 2.54 34.00 5.22 2.54 35.00 5.22 2.54 36.00 5.22 2.54 37.00 5.22 2.54 38.00 5.22 2.54 39.00 5.22 2.54 40.00 5.22 2.54 41.00 5.22 2.54 42.00 5.22 2.54 43.00 5.22 2.54 44.00 5.22 2.54 45.00 5.22 2.54 46.00 5.22 2.54 47.00 5.22 2.54 48.00 5.22 2.54 49.00 5.22 2.54 50.00 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 0.01 0.14 0.03 0.02 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 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 5.22 2.54 52.00 5.22 2.54 53.00 5.22 2.54 54.00 5.22 2.54 55.00 5.22 2.54 56.00 5.22 2.54 57.00 5.22 2.54 58.00 5.22 2.54 59.00 5.22 2.54 60.00 5.22 2.54 61.00 5.22 2.54 62.00 5.22 2.54 63.00 5.22 2.54 64.00 5.22 2.54 65.00 5.22 2.54 66.00 5.22 2.54 67.00 5.22 2.54 68.00 5.22 2.54 69.00 5.22 2.54 70.00 5.22 2.54 71.00 5.22 2.54 72.00 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 Printed 10/25/2024 Page 68

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 69 Summary for Subcatchment 28S: undetained impervious Runoff = 0.04 cfs @ 12.09 hrs, Volume= Routed to Link 25L : POA 1 125 cf, Depth= 4.98" 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 10-Year Rainfall=5.22" Area (sf) 300 300 * CN 98 Description non pavement impervious 100.00% Impervious Area Subcatchment 28S: undetained impervious Hydrograph Flow (cfs) 0.042 0.04 0.038 0.036 0.034 0.032 Runoff 0.04 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=300 sf Runoff Volume=125 cf Runoff Depth=4.98" Tc=0.0 min CN=98 0.03 0.028 0.026 0.024 0.022 0.02 0.018 0.016 0.014 0.012 0.01 0.008 0.006 0.004 0.002 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)