complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 300 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 42P: Basin 9 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 0.03 0.05 0.06 0.10 0.20 2.31 0.25 0.14 0.09 0.08 0.07 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 0.00 0.00 Storage (cubic-feet) 0 3 5 6 11 20 930 2,706 15 10 8 7 6 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) 562.00 562.00 562.00 562.00 562.00 562.01 562.36 563.04 562.01 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 562.00 Outflow (cfs) 0.00 0.03 0.05 0.06 0.10 0.20 0.61 0.61 0.14 0.09 0.08 0.07 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 0.00 0.00 Discarded (cfs) 0.00 0.03 0.05 0.06 0.10 0.20 0.61 0.61 0.14 0.09 0.08 0.07 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 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" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 42P: Basin 9 Elevation (feet) 562.00 562.05 562.10 562.15 562.20 562.25 562.30 562.35 562.40 562.45 562.50 562.55 562.60 562.65 562.70 562.75 562.80 562.85 562.90 562.95 563.00 563.05 563.10 563.15 563.20 563.25 563.30 563.35 563.40 563.45 563.50 563.55 563.60 563.65 563.70 563.75 563.80 563.85 563.90 563.95 564.00 564.05 564.10 564.15 564.20 564.25 564.30 564.35 564.40 Discharge (cfs) 0.00 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.62 0.65 0.67 0.69 0.70 0.72 0.73 0.74 0.75 0.76 0.77 0.78 0.78 0.79 0.80 0.81 0.81 0.82 0.83 0.98 1.25 1.60 2.01 2.47 2.98 3.53 4.11 Discarded (cfs) 0.00 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 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 0.01 0.02 0.04 0.06 0.08 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.19 0.20 0.21 0.21 0.22 0.37 0.64 0.99 1.40 1.87 2.37 2.92 3.51 Printed 10/25/2024 Page 301

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 42P: Basin 9 Elevation (feet) 562.00 562.05 562.10 562.15 562.20 562.25 562.30 562.35 562.40 562.45 562.50 562.55 562.60 562.65 562.70 562.75 562.80 562.85 562.90 562.95 563.00 563.05 563.10 563.15 563.20 563.25 563.30 563.35 563.40 563.45 563.50 563.55 563.60 563.65 563.70 563.75 563.80 563.85 563.90 563.95 564.00 564.05 564.10 564.15 564.20 564.25 564.30 564.35 564.40 Surface (sq-ft) 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 6,534 Storage (cubic-feet) 0 131 261 392 523 653 784 915 1,045 1,176 1,307 1,437 1,568 1,699 1,830 1,960 2,091 2,222 2,352 2,483 2,614 2,744 2,875 3,006 3,136 3,267 3,398 3,528 3,659 3,790 3,920 4,051 4,182 4,312 4,443 4,574 4,704 4,835 4,966 5,097 5,227 5,358 5,489 5,619 5,750 5,881 6,011 6,142 6,273 Printed 10/25/2024 Page 302

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 303 Summary for Pond 48P: Basin 8 Inflow Area = 61,044 sf, 62.67% Impervious, Inflow Depth = 7.47" for 100-Year event Inflow = 9.79 cfs @ 12.16 hrs, Volume= 38,015 cf Outflow = 4.41 cfs @ 12.32 hrs, Volume= 38,015 cf, Atten= 55%, Lag= 9.7 min Discarded = 3.73 cfs @ 12.32 hrs, Volume= 36,926 cf Primary = 0.68 cfs @ 12.32 hrs, Volume= 1,089 cf Routed to Pond 49P : Basin 7 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 574.22' @ 12.32 hrs Surf.Area= 10,019 sf Storage= 4,871 cf Plug-Flow detention time= 5.7 min calculated for 37,996 cf (100% of inflow) Center-of-Mass det. time= 5.7 min ( 770.6 - 764.9 ) Volume #1 Invert 573.00' Elevation (feet) 573.00 574.00 575.00 576.00 Device #1 #2 #3 Avail.Storage 12,023 cf Surf.Area (sq-ft) 10,019 10,019 10,019 10,019 Routing Primary Primary Discarded Invert 575.00' 573.45' 573.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 30,057 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 10,019 10,019 10,019 Cum.Store (cubic-feet) 0 10,019 20,038 30,057 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 10.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 571.00' Discarded OutFlow Max=3.73 cfs @ 12.32 hrs HW=574.21' (Free Discharge) 3=Exfiltration ( Controls 3.73 cfs) Primary OutFlow Max=0.68 cfs @ 12.32 hrs HW=574.21' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.68 cfs @ 3.45 fps) Pond 48P: Basin 8 Sharp-Crested Rectangular Weir 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 304 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 48P: Basin 8 Hydrograph 9.79 cfs Inflow Area=61,044 sf Peak Elev=574.22' Storage=4,871 cf 10 9 Inflow Outflow Discarded Primary 8 Flow (cfs) 7 6 4.41 cfs 5 3.73 cfs 4 3 2 0.68 cfs 1 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 48P: Basin 8 Stage-Discharge Total Discarded Primary 576 Sharp-Crested Rectangular Weir Elevation (feet) 575 574 Orifice Exfiltration 573 0 2 4 6 8 10 Discharge (cfs) 12 14 16 18

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 305 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 48P: Basin 8 Stage-Area-Storage 0 1,000 2,000 3,000 Surface/Horizontal/Wetted Area (sq-ft) 4,000 5,000 6,000 7,000 8,000 9,000 10,000 576 Elevation (feet) 575 574 Custom Stage Data 573 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Storage (cubic-feet) 8,000 9,000 10,000 11,000 12,000 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 306 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 48P: Basin 8 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 0.07 0.10 0.13 0.23 0.44 4.82 0.58 0.32 0.22 0.18 0.16 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 3 5 7 11 22 736 30 16 11 9 8 7 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) 573.00 573.00 573.00 573.00 573.00 573.01 573.18 573.01 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 Outflow (cfs) 0.00 0.07 0.10 0.13 0.23 0.44 2.53 0.59 0.32 0.22 0.18 0.16 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.07 0.10 0.13 0.23 0.44 2.53 0.59 0.32 0.22 0.18 0.16 0.13 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 307 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 48P: Basin 8 Elevation (feet) 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 574.95 575.00 575.05 575.10 575.15 575.20 575.25 575.30 575.35 575.40 575.45 575.50 Discharge (cfs) 0.00 2.38 2.44 2.49 2.55 2.61 2.67 2.73 2.78 2.84 2.91 2.99 3.08 3.18 3.30 3.42 3.54 3.67 3.79 3.89 4.00 4.10 4.19 4.29 4.38 4.47 4.56 4.65 4.73 4.82 4.90 4.99 5.07 5.15 5.24 5.32 5.40 5.48 5.56 5.64 5.72 5.94 6.28 6.70 7.19 7.72 8.30 8.92 9.58 10.27 11.00 Discarded (cfs) 0.00 2.38 2.44 2.49 2.55 2.61 2.67 2.73 2.78 2.84 2.90 2.96 3.01 3.07 3.13 3.19 3.25 3.30 3.36 3.42 3.48 3.54 3.59 3.65 3.71 3.77 3.83 3.88 3.94 4.00 4.06 4.12 4.17 4.23 4.29 4.35 4.41 4.46 4.52 4.58 4.64 4.70 4.75 4.81 4.87 4.93 4.99 5.04 5.10 5.16 5.22 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.07 0.11 0.17 0.23 0.30 0.36 0.43 0.47 0.52 0.56 0.60 0.63 0.67 0.70 0.73 0.76 0.79 0.82 0.85 0.87 0.90 0.92 0.95 0.97 0.99 1.01 1.04 1.06 1.08 1.24 1.53 1.89 2.32 2.79 3.31 3.88 4.48 5.11 5.78 Elevation (feet) 575.55 575.60 575.65 575.70 575.75 575.80 575.85 575.90 575.95 576.00 Discharge (cfs) 11.75 12.53 13.34 14.18 15.04 15.92 16.82 17.75 18.69 19.66 Discarded (cfs) 5.28 5.33 5.39 5.45 5.51 5.57 5.62 5.68 5.74 5.80 Primary (cfs) 6.47 7.20 7.95 8.73 9.53 10.35 11.20 12.07 12.95 13.86

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 308 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 48P: Basin 8 Elevation (feet) 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 574.95 575.00 575.05 575.10 575.15 575.20 575.25 575.30 575.35 575.40 575.45 575.50 Surface (sq-ft) 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 Storage (cubic-feet) 0 200 401 601 802 1,002 1,202 1,403 1,603 1,803 2,004 2,204 2,405 2,605 2,805 3,006 3,206 3,406 3,607 3,807 4,008 4,208 4,408 4,609 4,809 5,010 5,210 5,410 5,611 5,811 6,011 6,212 6,412 6,613 6,813 7,013 7,214 7,414 7,614 7,815 8,015 8,216 8,416 8,616 8,817 9,017 9,217 9,418 9,618 9,819 10,019 Elevation (feet) 575.55 575.60 575.65 575.70 575.75 575.80 575.85 575.90 575.95 576.00 Surface (sq-ft) 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 10,019 Storage (cubic-feet) 10,219 10,420 10,620 10,821 11,021 11,221 11,422 11,622 11,822 12,023

POA-2 NOAA 24-hr D 100-Year Rainfall=8.66" 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 309 Summary for Pond 49P: Basin 7 Inflow Area = 165,500 sf, 50.78% Impervious, Inflow Depth = 4.49" for 100-Year event Inflow = 14.70 cfs @ 12.20 hrs, Volume= 61,976 cf Outflow = 3.65 cfs @ 12.65 hrs, Volume= 56,198 cf, Atten= 75%, Lag= 27.1 min Primary = 3.65 cfs @ 12.65 hrs, Volume= 56,198 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= 532.81' @ 12.65 hrs Surf.Area= 17,532 sf Storage= 28,901 cf Plug-Flow detention time= 235.8 min calculated for 56,170 cf (91% of inflow) Center-of-Mass det. time= 187.5 min ( 968.3 - 780.9 ) Volume #1 Invert 531.00' Elevation (feet) 531.00 532.00 533.00 534.00 Device #1 Avail.Storage 50,966 cf Surf.Area (sq-ft) 14,375 16,117 17,860 19,602 Routing Primary Invert 531.38' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 15,246 16,989 18,731 Cum.Store (cubic-feet) 0 15,246 32,235 50,966 Outlet Devices 12.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.65 cfs @ 12.65 hrs HW=532.81' (Free Discharge) 1=Orifice (Orifice Controls 3.65 cfs @ 4.65 fps) Pond 49P: Basin 7 Orifice