complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" 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 290

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 291 Summary for Pond 41P: Basin 10 Inflow Area = 90,349 sf, 58.79% Impervious, Inflow Depth = 7.27" for 100-Year event Inflow = 13.17 cfs @ 12.18 hrs, Volume= 54,771 cf Outflow = 7.53 cfs @ 12.32 hrs, Volume= 54,771 cf, Atten= 43%, Lag= 8.5 min Discarded = 2.22 cfs @ 11.68 hrs, Volume= 44,788 cf Primary = 5.31 cfs @ 12.32 hrs, Volume= 9,983 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= 576.86' @ 12.32 hrs Surf.Area= 9,583 sf Storage= 8,209 cf Plug-Flow detention time= 10.0 min calculated for 54,744 cf (100% of inflow) Center-of-Mass det. time= 10.0 min ( 780.2 - 770.2 ) 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 @ 11.68 hrs HW=576.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 2.22 cfs) Primary OutFlow Max=5.31 cfs @ 12.32 hrs HW=576.86' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs) 2=Orifice/Grate (Orifice Controls 5.31 cfs @ 2.50 fps) Pond 41P: Basin 10 Orifice/Grate Orifice/Grate Exfiltration

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 292 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 41P: Basin 10 Hydrograph 13.17 cfs Inflow Area=90,349 sf Peak Elev=576.86' Storage=8,209 cf 14 13 12 Inflow Outflow Discarded Primary 11 10 Flow (cfs) 7.53 cfs 9 8 7 6 5.31 cfs 5 4 2.22 cfs 3 2 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 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 293 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 100-Year Rainfall=8.66" Printed 10/25/2024 Page 294 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 0.09 0.14 0.18 0.31 0.61 6.08 0.86 0.47 0.32 0.27 0.23 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 12 18 23 40 78 2,008 125 62 42 35 30 25 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) 576.00 576.00 576.00 576.00 576.00 576.01 576.21 576.01 576.01 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 576.00 Outflow (cfs) 0.00 0.09 0.14 0.18 0.31 0.60 2.22 0.97 0.48 0.32 0.27 0.23 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.09 0.14 0.18 0.31 0.60 2.22 0.97 0.48 0.32 0.27 0.23 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 100-Year Rainfall=8.66" Printed 10/25/2024 Page 295 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 41P: Basin 10 Elevation (feet) 576.00 576.05 576.10 576.15 576.20 576.25 576.30 576.35 576.40 576.45 576.50 576.55 576.60 576.65 576.70 576.75 576.80 576.85 576.90 576.95 577.00 577.05 577.10 577.15 577.20 577.25 577.30 577.35 577.40 577.45 577.50 577.55 577.60 577.65 577.70 577.75 577.80 577.85 577.90 577.95 578.00 578.05 578.10 578.15 578.20 578.25 578.30 578.35 578.40 578.45 578.50 Discharge (cfs) 0.00 2.22 2.22 2.22 2.22 2.22 2.34 2.57 2.87 3.22 3.62 4.06 4.54 5.06 5.61 6.19 6.80 7.44 8.11 8.80 9.52 10.26 11.02 11.81 12.62 13.45 14.18 14.82 15.42 15.98 16.52 17.61 19.17 21.03 23.12 25.43 27.91 30.57 33.38 36.33 39.43 42.65 46.00 49.47 53.05 56.74 60.54 64.45 68.45 72.56 76.75 Discarded (cfs) 0.00 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.36 0.65 1.00 1.40 1.85 2.33 2.84 3.39 3.97 4.58 5.22 5.89 6.58 7.30 8.04 8.80 9.59 10.40 11.23 11.96 12.61 13.20 13.76 14.30 15.39 16.95 18.81 20.90 23.21 25.69 28.35 31.16 34.12 37.21 40.43 43.78 47.25 50.83 54.53 58.33 62.23 66.23 70.34 74.54 Elevation (feet) 578.55 578.60 578.65 578.70 578.75 578.80 578.85 578.90 578.95 579.00 Discharge (cfs) 81.05 85.43 89.90 94.46 99.11 103.84 108.65 113.54 118.51 121.80 Discarded (cfs) 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 2.22 Primary (cfs) 78.83 83.21 87.68 92.24 96.89 101.62 106.43 111.32 116.29 119.58

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 296 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 41P: Basin 10 Elevation (feet) 576.00 576.05 576.10 576.15 576.20 576.25 576.30 576.35 576.40 576.45 576.50 576.55 576.60 576.65 576.70 576.75 576.80 576.85 576.90 576.95 577.00 577.05 577.10 577.15 577.20 577.25 577.30 577.35 577.40 577.45 577.50 577.55 577.60 577.65 577.70 577.75 577.80 577.85 577.90 577.95 578.00 578.05 578.10 578.15 578.20 578.25 578.30 578.35 578.40 578.45 578.50 Surface (sq-ft) 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 Storage (cubic-feet) 0 479 958 1,437 1,917 2,396 2,875 3,354 3,833 4,312 4,792 5,271 5,750 6,229 6,708 7,187 7,666 8,146 8,625 9,104 9,583 10,062 10,541 11,020 11,500 11,979 12,458 12,937 13,416 13,895 14,375 14,854 15,333 15,812 16,291 16,770 17,249 17,729 18,208 18,687 19,166 19,645 20,124 20,603 21,083 21,562 22,041 22,520 22,999 23,478 23,958 Elevation (feet) 578.55 578.60 578.65 578.70 578.75 578.80 578.85 578.90 578.95 579.00 Surface (sq-ft) 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 9,583 Storage (cubic-feet) 24,437 24,916 25,395 25,874 26,353 26,832 27,312 27,791 28,270 28,749

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 297 Summary for Pond 42P: Basin 9 Inflow Area = 26,377 sf, 66.20% Impervious, Inflow Depth = 7.60" for 100-Year event Inflow = 4.43 cfs @ 12.14 hrs, Volume= 16,713 cf Outflow = 0.77 cfs @ 12.63 hrs, Volume= 16,713 cf, Atten= 83%, Lag= 29.2 min Discarded = 0.61 cfs @ 11.56 hrs, Volume= 15,973 cf Primary = 0.16 cfs @ 12.63 hrs, Volume= 739 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= 563.59' @ 12.63 hrs Surf.Area= 6,534 sf Storage= 4,157 cf Plug-Flow detention time= 35.2 min calculated for 16,713 cf (100% of inflow) Center-of-Mass det. time= 35.2 min ( 796.3 - 761.1 ) Volume #1 Invert 562.00' Elevation (feet) 562.00 563.00 564.00 564.42 Device #1 #2 #3 Avail.Storage 6,325 cf Surf.Area (sq-ft) 6,534 6,534 6,534 6,534 Routing Primary Primary Discarded Invert 564.00' 563.00' 562.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 15,812 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 6,534 6,534 2,744 Cum.Store (cubic-feet) 0 6,534 13,068 15,812 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 3.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.61 cfs @ 11.56 hrs HW=562.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.61 cfs) Primary OutFlow Max=0.16 cfs @ 12.63 hrs HW=563.59' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.16 cfs @ 3.28 fps) Sharp-Crested Rectangular Weir Pond 42P: Basin 9 Orifice Exfiltration

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 298 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 42P: Basin 9 Hydrograph 4.43 cfs Inflow Area=26,377 sf Peak Elev=563.59' Storage=4,157 cf Flow (cfs) 4 Inflow Outflow Discarded Primary 3 2 0.77 cfs 0.61 cfs 1 0.16 cfs 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 42P: Basin 9 Stage-Discharge Total Discarded Primary Sharp-Crested Rectangular Weir Elevation (feet) 564 Orifice 563 Exfiltration 562 0 1 2 Discharge (cfs) 3 4

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 299 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 42P: Basin 9 Stage-Area-Storage 0 500 1,000 1,500 Surface/Horizontal/Wetted Area (sq-ft) 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 Elevation (feet) 564 563 Custom Stage Data 562 0 1,000 2,000 3,000 Storage (cubic-feet) 4,000 5,000 6,000 6,500 Surface Storage