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 171 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 22P: Basin 4 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 11,000 12,000 Elevation (feet) 574 573 Custom Stage Data 572 0 2,000 4,000 6,000 8,000 Storage (cubic-feet) 10,000 12,000 14,000 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 172 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 22P: Basin 4 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 0.12 0.23 2.98 0.28 0.15 0.10 0.09 0.08 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 4 7 10 15 29 703 39 20 13 11 10 8 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) 572.00 572.00 572.00 572.00 572.00 572.01 572.14 572.01 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 Outflow (cfs) 0.00 0.03 0.06 0.08 0.12 0.23 1.13 0.31 0.16 0.10 0.09 0.08 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 0.06 0.08 0.12 0.23 1.13 0.31 0.16 0.10 0.09 0.08 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 10-Year Rainfall=5.22" Printed 10/25/2024 Page 173 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 22P: Basin 4 Elevation (feet) 572.00 572.05 572.10 572.15 572.20 572.25 572.30 572.35 572.40 572.45 572.50 572.55 572.60 572.65 572.70 572.75 572.80 572.85 572.90 572.95 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 Discharge (cfs) 0.00 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.14 1.16 1.19 1.24 1.30 1.36 1.43 1.49 1.55 1.60 1.65 1.69 1.73 1.76 1.80 1.83 1.86 1.89 1.92 1.95 1.97 2.00 2.03 2.05 2.07 2.10 2.12 2.14 2.17 2.19 2.35 2.64 3.00 3.43 3.90 4.42 4.99 5.59 6.22 6.89 Discarded (cfs) 0.00 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 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 1.22 1.51 1.87 2.30 2.77 3.29 3.86 4.46 5.09 5.76 Elevation (feet) 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 Discharge (cfs) 7.59 8.31 9.06 9.84 10.64 11.47 12.31 13.18 Discarded (cfs) 1.13 1.13 1.13 1.13 1.13 1.13 1.13 1.13 Primary (cfs) 6.46 7.18 7.93 8.71 9.51 10.34 11.18 12.05

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 174 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 22P: Basin 4 Elevation (feet) 572.00 572.05 572.10 572.15 572.20 572.25 572.30 572.35 572.40 572.45 572.50 572.55 572.60 572.65 572.70 572.75 572.80 572.85 572.90 572.95 573.00 573.05 573.10 573.15 573.20 573.25 573.30 573.35 573.40 573.45 573.50 573.55 573.60 573.65 573.70 573.75 573.80 573.85 573.90 573.95 574.00 574.05 574.10 574.15 574.20 574.25 574.30 574.35 574.40 574.45 574.50 Surface (sq-ft) 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 Storage (cubic-feet) 0 244 488 732 976 1,220 1,464 1,708 1,952 2,195 2,439 2,683 2,927 3,171 3,415 3,659 3,903 4,147 4,391 4,635 4,879 5,123 5,367 5,611 5,855 6,099 6,342 6,586 6,830 7,074 7,318 7,562 7,806 8,050 8,294 8,538 8,782 9,026 9,270 9,514 9,758 10,002 10,245 10,489 10,733 10,977 11,221 11,465 11,709 11,953 12,197 Elevation (feet) 574.55 574.60 574.65 574.70 574.75 574.80 574.85 574.90 Surface (sq-ft) 12,197 12,197 12,197 12,197 12,197 12,197 12,197 12,197 Storage (cubic-feet) 12,441 12,685 12,929 13,173 13,417 13,661 13,905 14,149

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 175 Summary for Pond 27P: Basin 2 Inflow Area = 183,393 sf, 42.82% Impervious, Inflow Depth = 2.09" for 10-Year event Inflow = 8.13 cfs @ 12.18 hrs, Volume= 31,954 cf Outflow = 0.93 cfs @ 13.25 hrs, Volume= 22,643 cf, Atten= 89%, Lag= 64.2 min Primary = 0.93 cfs @ 13.25 hrs, Volume= 22,643 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= 545.18' @ 13.25 hrs Surf.Area= 28,204 sf Storage= 18,379 cf Plug-Flow detention time= 403.9 min calculated for 22,632 cf (71% of inflow) Center-of-Mass det. time= 300.9 min ( 1,107.1 - 806.2 ) Volume #1 Invert 544.50' Elevation (feet) 544.50 546.00 547.00 Avail.Storage 74,059 cf Surf.Area (sq-ft) 26,023 30,850 31,958 Device #1 Routing Primary Invert 545.50' #2 Primary 544.85' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 42,655 31,404 Cum.Store (cubic-feet) 0 42,655 74,059 Outlet Devices 42.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 1.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 0.7' Crest Height Primary OutFlow Max=0.93 cfs @ 13.25 hrs HW=545.18' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.93 cfs @ 1.98 fps) Pond 27P: Basin 2 Grate Sharp-Crested Rectangular 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 176 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 27P: Basin 2 Hydrograph 9 Inflow Primary 8.13 cfs Inflow Area=183,393 sf Peak Elev=545.18' Storage=18,379 cf 8 7 Flow (cfs) 6 5 4 3 2 0.93 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 74 76 78 80 Time (hours) Pond 27P: Basin 2 Stage-Discharge Elevation (feet) 547 Primary 546 Grate 545 Sharp-Crested Rectangular Weir 0 10 20 30 40 50 Discharge (cfs) 60 70 80 90

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 177 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 27P: Basin 2 Stage-Area-Storage 0 Surface/Horizontal/Wetted Area (sq-ft) 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 30,000 Elevation (feet) 547 546 545 Custom Stage Data 0 10,000 20,000 30,000 40,000 Storage (cubic-feet) 50,000 60,000 70,000 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 27P: Basin 2 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 0.02 0.04 0.06 0.10 0.26 3.54 0.58 0.32 0.22 0.19 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 49 287 644 1,167 2,301 8,017 17,862 15,796 14,349 13,392 12,808 12,382 11,420 10,817 10,438 10,180 10,002 9,872 9,767 9,681 9,611 9,554 9,508 9,470 9,440 9,415 9,394 9,378 9,364 9,353 9,344 9,337 9,331 9,326 9,322 9,319 9,317 9,314 9,313 9,311 Elevation (feet) 544.50 544.50 544.51 544.52 544.54 544.59 544.80 545.16 545.09 545.03 545.00 544.98 544.96 544.93 544.91 544.89 544.88 544.88 544.87 544.87 544.86 544.86 544.86 544.86 544.86 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.85 0.57 0.39 0.28 0.23 0.19 0.11 0.07 0.04 0.03 0.02 0.02 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 0.00 Printed 10/25/2024 Page 178

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 27P: Basin 2 Elevation (feet) 544.50 544.52 544.54 544.56 544.58 544.60 544.62 544.64 544.66 544.68 544.70 544.72 544.74 544.76 544.78 544.80 544.82 544.84 544.86 544.88 544.90 544.92 544.94 544.96 544.98 545.00 545.02 545.04 545.06 545.08 545.10 545.12 545.14 545.16 545.18 545.20 545.22 545.24 545.26 545.28 545.30 545.32 545.34 545.36 545.38 545.40 545.42 545.44 545.46 545.48 545.50 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 0.03 0.05 0.09 0.13 0.18 0.23 0.29 0.35 0.41 0.48 0.55 0.62 0.69 0.77 0.86 0.94 1.03 1.12 1.21 1.30 1.40 1.50 1.60 1.71 1.81 1.92 2.03 2.14 2.26 2.38 2.49 2.61 Elevation (feet) 545.52 545.54 545.56 545.58 545.60 545.62 545.64 545.66 545.68 545.70 545.72 545.74 545.76 545.78 545.80 545.82 545.84 545.86 545.88 545.90 545.92 545.94 545.96 545.98 546.00 546.02 546.04 546.06 546.08 546.10 546.12 546.14 546.16 546.18 546.20 546.22 546.24 546.26 546.28 546.30 546.32 546.34 546.36 546.38 546.40 546.42 546.44 546.46 546.48 546.50 546.52 Primary (cfs) 2.88 3.25 3.71 4.22 4.79 5.41 6.08 6.78 7.52 8.30 9.11 9.96 10.84 11.75 12.68 13.65 14.64 15.66 16.71 17.78 18.88 20.00 21.14 22.30 23.49 24.70 25.93 27.19 28.46 29.76 31.07 32.41 33.76 35.13 36.52 37.93 39.36 40.81 42.27 43.76 45.26 46.77 48.31 49.86 51.42 53.01 54.60 56.22 57.85 59.50 61.16 Elevation (feet) 546.54 546.56 546.58 546.60 546.62 546.64 546.66 546.68 546.70 546.72 546.74 546.76 546.78 546.80 546.82 546.84 546.86 546.88 546.90 546.92 546.94 546.96 546.98 547.00 Primary (cfs) 62.84 64.53 66.23 67.96 69.69 71.44 73.21 74.99 76.78 78.59 80.41 82.24 84.09 85.96 87.83 89.72 91.62 93.21 93.97 94.73 95.49 96.24 96.99 97.73 Printed 10/25/2024 Page 179

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 27P: Basin 2 Elevation (feet) 544.50 544.55 544.60 544.65 544.70 544.75 544.80 544.85 544.90 544.95 545.00 545.05 545.10 545.15 545.20 545.25 545.30 545.35 545.40 545.45 545.50 545.55 545.60 545.65 545.70 545.75 545.80 545.85 545.90 545.95 546.00 546.05 546.10 546.15 546.20 546.25 546.30 546.35 546.40 546.45 546.50 546.55 546.60 546.65 546.70 546.75 546.80 546.85 546.90 546.95 547.00 Surface (sq-ft) 26,023 26,184 26,345 26,506 26,667 26,828 26,988 27,149 27,310 27,471 27,632 27,793 27,954 28,115 28,276 28,437 28,597 28,758 28,919 29,080 29,241 29,402 29,563 29,724 29,885 30,046 30,206 30,367 30,528 30,689 30,850 30,905 30,961 31,016 31,072 31,127 31,182 31,238 31,293 31,349 31,404 31,459 31,515 31,570 31,626 31,681 31,736 31,792 31,847 31,903 31,958 Storage (cubic-feet) 0 1,305 2,618 3,940 5,269 6,606 7,952 9,305 10,667 12,036 13,414 14,799 16,193 17,595 19,005 20,422 21,848 23,282 24,724 26,174 27,632 29,098 30,572 32,054 33,545 35,043 36,549 38,063 39,586 41,116 42,655 44,199 45,745 47,295 48,847 50,402 51,960 53,520 55,083 56,649 58,218 59,790 61,364 62,941 64,521 66,104 67,689 69,278 70,868 72,462 74,059 Printed 10/25/2024 Page 180