complete drainage report rev 9

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 124 Summary for Subcatchment 28S: Basin 2 - Imp Runoff = 2.92 cfs @ 12.17 hrs, Volume= Routed to Pond 27P : Basin 2 12,529 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) 28,866 1,307 30,173 30,173 CN 98 98 98 Description Paved parking, sidewalk, other imp Paved parking, sidewalk other imp Weighted Average 100.00% Impervious 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 28S: Basin 2 - Imp

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 125 Subcatchment 28S: Basin 2 - Imp Hydrograph Runoff 3 Flow (cfs) 2 1 2.92 cfs NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=30,173 sf Runoff Volume=12,529 cf Runoff Depth=4.98" Flow Length=463' Tc=10.5 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 28S: Basin 2 - 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 0.03 0.04 0.04 0.05 0.05 0.06 0.07 0.09 0.10 0.14 0.18 0.33 1.40 0.46 0.22 0.16 0.11 0.10 0.09 0.07 0.06 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 Time Precip. Excess (hours) (inches)

16 0.11 0.10 0.09 0.07 0.06 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 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 126

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 127 Summary for Subcatchment 29S: Basin 8 - Imp Runoff = 3.97 cfs @ 12.15 hrs, Volume= Routed to Pond 48P : Basin 8 15,886 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) 8,924 11,475 17,858 38,257 38,257 CN 98 98 98 98 Description other impervious Roofs, HSG C pavement surface Weighted Average 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.3 100 0.0700 0.20 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.3 65 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 8.6 165 Total Sheet Flow (A-B) Subcatchment 29S: Basin 8 - Imp SCF (B-C)

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 128 Subcatchment 29S: Basin 8 - Imp Hydrograph Runoff 3.97 cfs 4 Flow (cfs) 3 2 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=38,257 sf Runoff Volume=15,886 cf Runoff Depth=4.98" Flow Length=165' Tc=8.6 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 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 29S: Basin 8 - 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 0.03 0.05 0.05 0.06 0.07 0.08 0.10 0.11 0.13 0.17 0.23 0.43 2.00 0.57 0.27 0.20 0.14 0.13 0.11 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.06 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)

20 0.14 0.13 0.11 0.09 0.08 0.08 0.07 0.07 0.06 0.06 0.06 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 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 129

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 130 Summary for Subcatchment 30S: Basin 8 - Perv Runoff = 1.55 cfs @ 12.16 hrs, Volume= Routed to Pond 48P : Basin 8 5,332 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) 11,542 11,245 22,787 22,787 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) 8.3 100 0.0700 0.20 Sheet Flow, Sheet Flow (A-B) Grass: Dense n= 0.240 P2= 3.47" 0.3 65 0.0600 3.94 Shallow Concentrated Flow, SCF (B-C) Unpaved Kv= 16.1 fps 8.6 165 Total Sheet Flow (A-B) Subcatchment 30S: Basin 8 - Perv SCF (B-C)

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 131 Subcatchment 30S: Basin 8 - Perv Hydrograph Runoff Flow (cfs) 1.55 cfs 1 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=22,787 sf Runoff Volume=5,332 cf Runoff Depth=2.81" Flow Length=165' Tc=8.6 min CN=77 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)