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 Hydrograph for Subcatchment 23S: Basin 6 - 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 0.01 12.00 1.65 0.20 13.00 2.55 0.63 14.00 2.76 0.76 15.00 2.89 0.84 16.00 2.99 0.90 17.00 3.08 0.96 18.00 3.15 1.00 19.00 3.20 1.04 20.00 3.26 1.08 21.00 3.31 1.11 22.00 3.36 1.14 23.00 3.40 1.17 24.00 3.44 1.20 25.00 3.44 1.20 26.00 3.44 1.20 27.00 3.44 1.20 28.00 3.44 1.20 29.00 3.44 1.20 30.00 3.44 1.20 31.00 3.44 1.20 32.00 3.44 1.20 33.00 3.44 1.20 34.00 3.44 1.20 35.00 3.44 1.20 36.00 3.44 1.20 37.00 3.44 1.20 38.00 3.44 1.20 39.00 3.44 1.20 40.00 3.44 1.20 41.00 3.44 1.20 42.00 3.44 1.20 43.00 3.44 1.20 44.00 3.44 1.20 45.00 3.44 1.20 46.00 3.44 1.20 47.00 3.44 1.20 48.00 3.44 1.20 49.00 3.44 1.20 50.00 3.44 1.20 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.86 0.22 0.12 0.08 0.07 0.06 0.05 0.04 0.04 0.04 0.04 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 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 3.44 1.20 52.00 3.44 1.20 53.00 3.44 1.20 54.00 3.44 1.20 55.00 3.44 1.20 56.00 3.44 1.20 57.00 3.44 1.20 58.00 3.44 1.20 59.00 3.44 1.20 60.00 3.44 1.20 61.00 3.44 1.20 62.00 3.44 1.20 63.00 3.44 1.20 64.00 3.44 1.20 65.00 3.44 1.20 66.00 3.44 1.20 67.00 3.44 1.20 68.00 3.44 1.20 69.00 3.44 1.20 70.00 3.44 1.20 71.00 3.44 1.20 72.00 3.44 1.20 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 21

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 22 Summary for Subcatchment 26S: DA 1 Und - Perv Runoff = 2.31 cfs @ 12.15 hrs, Volume= Routed to Link 25L : POA 1 7,472 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) 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 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 23 Subcatchment 26S: DA 1 Und - Perv Hydrograph Runoff 2.31 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=64,687 sf Runoff Volume=7,472 cf Runoff Depth=1.39" Flow Length=150' Slope=0.1100 '/' Tc=7.1 min CN=77 Flow (cfs) 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 26S: DA 1 Und - 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 0.06 0.99 0.32 0.17 0.12 0.10 0.08 0.07 0.06 0.06 0.05 0.05 0.05 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 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 24

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 25 Summary for Subcatchment 27S: Basin 5 - Perv Runoff = 0.13 cfs @ 12.10 hrs, Volume= Routed to Pond 18P : Basin 5 344 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) 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 0.14 Runoff 0.13 cfs 0.13 NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=3,440 sf Runoff Volume=344 cf Runoff Depth=1.20" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=74 0.12 0.11 0.1 Flow (cfs) 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 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 27S: Basin 5 - 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 0.01 12.00 1.65 0.20 13.00 2.55 0.63 14.00 2.76 0.76 15.00 2.89 0.84 16.00 2.99 0.90 17.00 3.08 0.96 18.00 3.15 1.00 19.00 3.20 1.04 20.00 3.26 1.08 21.00 3.31 1.11 22.00 3.36 1.14 23.00 3.40 1.17 24.00 3.44 1.20 25.00 3.44 1.20 26.00 3.44 1.20 27.00 3.44 1.20 28.00 3.44 1.20 29.00 3.44 1.20 30.00 3.44 1.20 31.00 3.44 1.20 32.00 3.44 1.20 33.00 3.44 1.20 34.00 3.44 1.20 35.00 3.44 1.20 36.00 3.44 1.20 37.00 3.44 1.20 38.00 3.44 1.20 39.00 3.44 1.20 40.00 3.44 1.20 41.00 3.44 1.20 42.00 3.44 1.20 43.00 3.44 1.20 44.00 3.44 1.20 45.00 3.44 1.20 46.00 3.44 1.20 47.00 3.44 1.20 48.00 3.44 1.20 49.00 3.44 1.20 50.00 3.44 1.20 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 0.06 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 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 3.44 1.20 52.00 3.44 1.20 53.00 3.44 1.20 54.00 3.44 1.20 55.00 3.44 1.20 56.00 3.44 1.20 57.00 3.44 1.20 58.00 3.44 1.20 59.00 3.44 1.20 60.00 3.44 1.20 61.00 3.44 1.20 62.00 3.44 1.20 63.00 3.44 1.20 64.00 3.44 1.20 65.00 3.44 1.20 66.00 3.44 1.20 67.00 3.44 1.20 68.00 3.44 1.20 69.00 3.44 1.20 70.00 3.44 1.20 71.00 3.44 1.20 72.00 3.44 1.20 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 26

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 27 Summary for Subcatchment 28S: undetained impervious Runoff = 0.02 cfs @ 12.09 hrs, Volume= Routed to Link 25L : POA 1 80 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) 300 300 * CN 98 Description non pavement impervious 100.00% Impervious Area Subcatchment 28S: undetained impervious Hydrograph Runoff 0.026 0.02 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=300 sf Runoff Volume=80 cf Runoff Depth=3.21" Tc=0.0 min CN=98 0.024 0.022 0.02 Flow (cfs) 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)

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 28S: undetained impervious 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.00 0.00 0.00 0.00 0.00 0.00 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 28

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 29 Summary for Pond 16P: Basin 1 Inflow Area = 416,846 sf, 59.40% Impervious, Inflow Depth = 1.52" for 2-Year event Inflow = 11.66 cfs @ 12.22 hrs, Volume= 52,670 cf Outflow = 0.75 cfs @ 14.57 hrs, Volume= 36,406 cf, Atten= 94%, Lag= 141.2 min Primary = 0.75 cfs @ 14.57 hrs, Volume= 36,406 cf Routed to Link 25L : POA 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 544.29' @ 14.57 hrs Surf.Area= 46,306 sf Storage= 35,472 cf Plug-Flow detention time= 738.2 min calculated for 36,406 cf (69% of inflow) Center-of-Mass det. time= 629.4 min ( 1,419.7 - 790.2 ) Volume #1 Invert 543.50' Elevation (feet) 543.50 544.00 545.00 546.00 547.00 Avail.Storage 170,585 cf Surf.Area (sq-ft) 42,000 45,955 47,156 51,115 54,695 Device #1 Routing Primary Invert 546.00' #2 #3 Primary Primary 543.82' 544.40' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 21,989 46,556 49,136 52,905 Cum.Store (cubic-feet) 0 21,989 68,544 117,680 170,585 Outlet Devices 42.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 10.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 48.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.75 cfs @ 14.57 hrs HW=544.29' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.75 cfs @ 2.34 fps) 3=Orifice/Grate ( Controls 0.00 cfs) Pond 16P: Basin 1 Grate Orifice/Grate Orifice

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 30 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 16P: Basin 1 Hydrograph 13 Inflow Primary 11.66 cfs Inflow Area=416,846 sf Peak Elev=544.29' Storage=35,472 cf 12 11 10 9 Flow (cfs) 8 7 6 5 4 3 2 0.75 cfs 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) Pond 16P: Basin 1 Stage-Discharge 547 Primary Grate Elevation (feet) 546 545 Orifice/Grate 544 Orifice 0 5 10 15 20 25 30 35 40 Discharge (cfs) 45 50 55 60 65 70