complete drainage report rev 9

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 201 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 10-Year Rainfall=5.22" Printed 10/25/2024 Page 202 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 0.03 0.05 0.07 0.12 0.23 2.68 0.34 0.19 0.13 0.11 0.09 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 1 3 4 6 12 136 17 10 6 5 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) 573.00 573.00 573.00 573.00 573.00 573.00 573.03 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 573.00 Outflow (cfs) 0.00 0.03 0.05 0.07 0.12 0.23 2.36 0.34 0.19 0.13 0.11 0.09 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.07 0.12 0.23 2.36 0.34 0.19 0.13 0.11 0.09 0.08 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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" Printed 10/25/2024 Page 203 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 10-Year Rainfall=5.22" Printed 10/25/2024 Page 204 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 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 205 Summary for Pond 49P: Basin 7 Inflow Area = 165,500 sf, 50.78% Impervious, Inflow Depth = 2.37" for 10-Year event Inflow = 7.67 cfs @ 12.20 hrs, Volume= 32,740 cf Outflow = 1.73 cfs @ 12.69 hrs, Volume= 26,967 cf, Atten= 77%, Lag= 29.6 min Primary = 1.73 cfs @ 12.69 hrs, Volume= 26,967 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= 532.09' @ 12.69 hrs Surf.Area= 16,282 sf Storage= 16,775 cf Plug-Flow detention time= 332.7 min calculated for 26,967 cf (82% of inflow) Center-of-Mass det. time= 253.4 min ( 1,045.3 - 791.8 ) 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=1.73 cfs @ 12.69 hrs HW=532.09' (Free Discharge) 1=Orifice (Orifice Controls 1.73 cfs @ 2.88 fps) Pond 49P: Basin 7 Orifice

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 206 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 49P: Basin 7 Hydrograph Inflow Primary 7.67 cfs Inflow Area=165,500 sf Peak Elev=532.09' Storage=16,775 cf 8 7 Flow (cfs) 6 5 4 3 1.73 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 74 76 78 80 Time (hours) Pond 49P: Basin 7 Stage-Discharge 534 Primary Elevation (feet) 533 532 Orifice 531 0 1 2 3 Discharge (cfs) 4 5

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 207 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 49P: Basin 7 Stage-Area-Storage 0 2,000 4,000 Surface/Horizontal/Wetted Area (sq-ft) 6,000 8,000 10,000 12,000 14,000 16,000 18,000 45,000 50,000 534 Elevation (feet) 533 532 Custom Stage Data 531 0 5,000 10,000 15,000 20,000 25,000 30,000 Storage (cubic-feet) 35,000 40,000 Surface Storage

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 Pond 49P: Basin 7 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 0.06 0.08 0.14 0.31 3.25 0.56 0.31 0.21 0.18 0.15 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 71 429 967 1,749 3,199 9,007 14,247 11,370 10,053 9,311 8,897 8,591 7,772 7,266 6,947 6,725 6,567 6,443 6,345 6,267 6,205 6,155 6,109 6,069 6,032 5,999 5,970 5,943 5,919 5,898 5,879 5,861 5,846 5,832 5,819 5,808 5,798 5,789 5,781 5,773 Elevation (feet) 531.00 531.00 531.03 531.07 531.12 531.22 531.60 531.94 531.76 531.67 531.62 531.60 531.58 531.52 531.49 531.47 531.46 531.44 531.44 531.43 531.43 531.42 531.42 531.41 531.41 531.41 531.41 531.41 531.40 531.40 531.40 531.40 531.40 531.40 531.40 531.40 531.39 531.39 531.39 531.39 531.39 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.21 1.15 0.56 0.35 0.25 0.20 0.17 0.09 0.05 0.04 0.03 0.02 0.02 0.01 0.01 0.01 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 Printed 10/25/2024 Page 208

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 49P: Basin 7 Elevation (feet) 531.00 531.02 531.04 531.06 531.08 531.10 531.12 531.14 531.16 531.18 531.20 531.22 531.24 531.26 531.28 531.30 531.32 531.34 531.36 531.38 531.40 531.42 531.44 531.46 531.48 531.50 531.52 531.54 531.56 531.58 531.60 531.62 531.64 531.66 531.68 531.70 531.72 531.74 531.76 531.78 531.80 531.82 531.84 531.86 531.88 531.90 531.92 531.94 531.96 531.98 532.00 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 0.01 0.02 0.03 0.04 0.06 0.09 0.11 0.14 0.17 0.20 0.24 0.28 0.32 0.37 0.42 0.47 0.52 0.57 0.63 0.69 0.75 0.81 0.88 0.95 1.01 1.08 1.15 1.22 1.30 1.37 Elevation (feet) 532.02 532.04 532.06 532.08 532.10 532.12 532.14 532.16 532.18 532.20 532.22 532.24 532.26 532.28 532.30 532.32 532.34 532.36 532.38 532.40 532.42 532.44 532.46 532.48 532.50 532.52 532.54 532.56 532.58 532.60 532.62 532.64 532.66 532.68 532.70 532.72 532.74 532.76 532.78 532.80 532.82 532.84 532.86 532.88 532.90 532.92 532.94 532.96 532.98 533.00 533.02 Primary (cfs) 1.45 1.52 1.60 1.67 1.75 1.83 1.90 1.98 2.05 2.13 2.20 2.27 2.34 2.40 2.47 2.53 2.58 2.63 2.67 2.73 2.78 2.83 2.88 2.93 2.98 3.03 3.07 3.12 3.16 3.21 3.25 3.30 3.34 3.38 3.42 3.47 3.51 3.55 3.59 3.63 3.67 3.71 3.74 3.78 3.82 3.86 3.89 3.93 3.97 4.00 4.04 Elevation (feet) 533.04 533.06 533.08 533.10 533.12 533.14 533.16 533.18 533.20 533.22 533.24 533.26 533.28 533.30 533.32 533.34 533.36 533.38 533.40 533.42 533.44 533.46 533.48 533.50 533.52 533.54 533.56 533.58 533.60 533.62 533.64 533.66 533.68 533.70 533.72 533.74 533.76 533.78 533.80 533.82 533.84 533.86 533.88 533.90 533.92 533.94 533.96 533.98 534.00 Primary (cfs) 4.07 4.11 4.14 4.18 4.21 4.24 4.28 4.31 4.34 4.38 4.41 4.44 4.47 4.51 4.54 4.57 4.60 4.63 4.66 4.69 4.72 4.75 4.78 4.81 4.84 4.87 4.90 4.93 4.96 4.99 5.02 5.05 5.07 5.10 5.13 5.16 5.19 5.21 5.24 5.27 5.29 5.32 5.35 5.37 5.40 5.43 5.45 5.48 5.51 Printed 10/25/2024 Page 209

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 210 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 49P: Basin 7 Elevation (feet) 531.00 531.05 531.10 531.15 531.20 531.25 531.30 531.35 531.40 531.45 531.50 531.55 531.60 531.65 531.70 531.75 531.80 531.85 531.90 531.95 532.00 532.05 532.10 532.15 532.20 532.25 532.30 532.35 532.40 532.45 532.50 532.55 532.60 532.65 532.70 532.75 532.80 532.85 532.90 532.95 533.00 533.05 533.10 533.15 533.20 533.25 533.30 533.35 533.40 533.45 533.50 Surface (sq-ft) 14,375 14,462 14,549 14,636 14,723 14,811 14,898 14,985 15,072 15,159 15,246 15,333 15,420 15,507 15,594 15,682 15,769 15,856 15,943 16,030 16,117 16,204 16,291 16,378 16,466 16,553 16,640 16,727 16,814 16,901 16,989 17,076 17,163 17,250 17,337 17,424 17,511 17,599 17,686 17,773 17,860 17,947 18,034 18,121 18,208 18,296 18,383 18,470 18,557 18,644 18,731 Storage (cubic-feet) 0 721 1,446 2,176 2,910 3,648 4,391 5,138 5,889 6,645 7,405 8,170 8,939 9,712 10,489 11,271 12,057 12,848 13,643 14,442 15,246 16,054 16,866 17,683 18,504 19,330 20,160 20,994 21,832 22,675 23,522 24,374 25,230 26,090 26,955 27,824 28,697 29,575 30,457 31,344 32,235 33,130 34,029 34,933 35,841 36,754 37,671 38,592 39,518 40,448 41,382 Elevation (feet) 533.55 533.60 533.65 533.70 533.75 533.80 533.85 533.90 533.95 534.00 Surface (sq-ft) 18,818 18,905 18,992 19,079 19,167 19,254 19,341 19,428 19,515 19,602 Storage (cubic-feet) 42,321 43,264 44,211 45,163 46,119 47,080 48,045 49,014 49,988 50,966