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 181 Summary for Pond 33P: Basin 11 Inflow Area = 84,103 sf, 71.22% Impervious, Inflow Depth = 4.33" for 10-Year event Inflow = 7.47 cfs @ 12.17 hrs, Volume= 30,355 cf Outflow = 5.37 cfs @ 12.26 hrs, Volume= 30,355 cf, Atten= 28%, Lag= 5.4 min Discarded = 3.13 cfs @ 12.00 hrs, Volume= 28,464 cf Primary = 2.25 cfs @ 12.26 hrs, Volume= 1,891 cf Routed to Link 28L : POA 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 590.37' @ 12.26 hrs Surf.Area= 13,504 sf Storage= 1,989 cf Plug-Flow detention time= 1.9 min calculated for 30,339 cf (100% of inflow) Center-of-Mass det. time= 1.9 min ( 770.5 - 768.6 ) Volume #1 Invert 590.00' Elevation (feet) 590.00 591.00 592.00 592.42 Device #1 #2 Avail.Storage 13,072 cf Surf.Area (sq-ft) 13,504 13,504 13,504 13,504 Routing Primary Discarded Invert 590.10' 590.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 32,680 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 13,504 13,504 5,672 Cum.Store (cubic-feet) 0 13,504 27,008 32,680 Outlet Devices 5.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=3.13 cfs @ 12.00 hrs HW=590.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 3.13 cfs) Primary OutFlow Max=2.19 cfs @ 12.26 hrs HW=590.36' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 2.19 cfs @ 1.68 fps) Pond 33P: Basin 11 Sharp-Crested Rectangular Exfiltration Weir

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 182 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 33P: Basin 11 Hydrograph 7.47 cfs Inflow Area=84,103 sf Peak Elev=590.37' Storage=1,989 cf 8 7 5.37 cfs Inflow Outflow Discarded Primary Flow (cfs) 6 5 4 3.13 cfs 3 2.25 cfs 2 1 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 33P: Basin 11 Stage-Discharge Total Discarded Primary Elevation (feet) 592 591 Exfiltration Rectangular Weir Sharp-Crested 590 0 5 10 15 20 25 30 Discharge (cfs) 35 40 45 50 55

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 183 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 33P: Basin 11 Stage-Area-Storage 0 1,000 2,000 3,000 4,000 Surface/Horizontal/Wetted Area (sq-ft) 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 Elevation (feet) 592 591 Custom Stage Data 590 0 2,000 4,000 6,000 8,000 Storage (cubic-feet) 10,000 12,000 Surface Storage

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 184 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 33P: Basin 11 Time (hours) 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 Inflow (cfs) 0.00 0.04 0.08 0.11 0.18 0.34 3.53 0.47 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Storage (cubic-feet) 0 2 4 5 7 14 155 20 11 7 6 5 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 590.00 590.00 590.00 590.00 590.00 590.00 590.03 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 Outflow (cfs) 0.00 0.04 0.08 0.11 0.18 0.34 3.13 0.48 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Discarded (cfs) 0.00 0.04 0.08 0.11 0.18 0.34 3.13 0.48 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (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

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 Stage-Discharge for Pond 33P: Basin 11 Elevation (feet) 590.00 590.05 590.10 590.15 590.20 590.25 590.30 590.35 590.40 590.45 590.50 590.55 590.60 590.65 590.70 590.75 590.80 590.85 590.90 590.95 591.00 591.05 591.10 591.15 591.20 591.25 591.30 591.35 591.40 591.45 591.50 591.55 591.60 591.65 591.70 591.75 591.80 591.85 591.90 591.95 592.00 592.05 592.10 592.15 592.20 592.25 592.30 592.35 592.40 Discharge (cfs) 0.00 3.13 3.13 3.31 3.64 4.07 4.58 5.15 5.78 6.46 7.20 7.97 8.79 9.65 10.54 11.47 12.43 13.43 14.45 15.50 16.58 17.69 18.82 19.98 21.16 22.36 23.59 24.83 26.10 27.39 28.69 30.02 31.36 32.72 34.10 35.49 36.90 38.33 39.77 41.22 42.69 44.17 45.67 47.18 48.70 50.24 51.78 53.34 54.91 Discarded (cfs) 0.00 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 3.13 Primary (cfs) 0.00 0.00 0.00 0.18 0.51 0.94 1.45 2.02 2.65 3.34 4.07 4.85 5.66 6.52 7.42 8.35 9.31 10.30 11.32 12.38 13.46 14.56 15.70 16.85 18.03 19.24 20.46 21.71 22.97 24.26 25.57 26.89 28.23 29.59 30.97 32.37 33.78 35.20 36.64 38.10 39.57 41.05 42.55 44.05 45.58 47.11 48.66 50.21 51.78 Printed 10/25/2024 Page 185

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 Stage-Area-Storage for Pond 33P: Basin 11 Elevation (feet) 590.00 590.05 590.10 590.15 590.20 590.25 590.30 590.35 590.40 590.45 590.50 590.55 590.60 590.65 590.70 590.75 590.80 590.85 590.90 590.95 591.00 591.05 591.10 591.15 591.20 591.25 591.30 591.35 591.40 591.45 591.50 591.55 591.60 591.65 591.70 591.75 591.80 591.85 591.90 591.95 592.00 592.05 592.10 592.15 592.20 592.25 592.30 592.35 592.40 Surface (sq-ft) 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 13,504 Storage (cubic-feet) 0 270 540 810 1,080 1,350 1,620 1,891 2,161 2,431 2,701 2,971 3,241 3,511 3,781 4,051 4,321 4,591 4,861 5,132 5,402 5,672 5,942 6,212 6,482 6,752 7,022 7,292 7,562 7,832 8,102 8,372 8,643 8,913 9,183 9,453 9,723 9,993 10,263 10,533 10,803 11,073 11,343 11,613 11,884 12,154 12,424 12,694 12,964 Printed 10/25/2024 Page 186

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 187 Summary for Pond 41P: Basin 10 Inflow Area = 90,349 sf, 58.79% Impervious, Inflow Depth = 4.01" for 10-Year event Inflow = 7.31 cfs @ 12.18 hrs, Volume= 30,212 cf Outflow = 3.14 cfs @ 12.38 hrs, Volume= 30,212 cf, Atten= 57%, Lag= 12.3 min Discarded = 2.22 cfs @ 11.96 hrs, Volume= 28,927 cf Primary = 0.93 cfs @ 12.38 hrs, Volume= 1,285 cf Routed to Link 28L : POA 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 576.44' @ 12.38 hrs Surf.Area= 9,583 sf Storage= 4,207 cf Plug-Flow detention time= 8.1 min calculated for 30,197 cf (100% of inflow) Center-of-Mass det. time= 8.1 min ( 786.5 - 778.4 ) Volume #1 Invert 576.00' Elevation (feet) 576.00 577.00 578.00 579.00 Avail.Storage 28,749 cf Surf.Area (sq-ft) 9,583 9,583 9,583 9,583 Device #1 Routing Primary Invert 577.50' #2 Primary 576.25' #3 Discarded 576.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 9,583 9,583 9,583 Cum.Store (cubic-feet) 0 9,583 19,166 28,749 Outlet Devices 48.0" x 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads 42.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=2.22 cfs @ 11.96 hrs HW=576.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 2.22 cfs) Primary OutFlow Max=0.92 cfs @ 12.38 hrs HW=576.44' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs) 2=Orifice/Grate (Orifice Controls 0.92 cfs @ 1.39 fps) Pond 41P: Basin 10 Orifice/Grate Orifice/Grate Exfiltration

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 188 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 41P: Basin 10 Hydrograph 7.31 cfs Inflow Area=90,349 sf Peak Elev=576.44' Storage=4,207 cf 8 7 Inflow Outflow Discarded Primary Flow (cfs) 6 5 3.14 cfs 4 3 2.22 cfs 2 0.93 cfs 1 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 41P: Basin 10 Stage-Discharge Total Discarded Primary 579 Elevation (feet) 578 Orifice/Grate 577 Orifice/Grate Exfiltration 576 0 10 20 30 40 50 60 70 Discharge (cfs) 80 90 100 110 120

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 189 Pond 41P: Basin 10 Stage-Area-Storage 0 Surface/Horizontal/Wetted Area (sq-ft) 500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500 579 Elevation (feet) 578 577 Custom Stage Data 576 0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 24,000 26,000 28,000 Storage (cubic-feet) Surface Storage

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 190 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 41P: Basin 10 Time (hours) 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00 62.00 64.00 66.00 68.00 70.00 72.00 74.00 76.00 78.00 80.00 Inflow (cfs) 0.00 0.04 0.07 0.10 0.16 0.31 3.32 0.49 0.27 0.18 0.16 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Storage (cubic-feet) 0 5 10 13 20 40 449 65 35 24 20 17 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Elevation (feet) 576.00 576.00 576.00 576.00 576.00 576.00 576.05 576.01 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 Outflow (cfs) 0.00 0.04 0.07 0.10 0.15 0.31 2.22 0.50 0.27 0.19 0.16 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Discarded (cfs) 0.00 0.04 0.07 0.10 0.15 0.31 2.22 0.50 0.27 0.19 0.16 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Primary (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