complete drainage report rev 9

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 72 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 27P: Basin 2 Hydrograph Inflow Primary 4.44 cfs Inflow Area=183,393 sf Peak Elev=544.96' Storage=12,418 cf Flow (cfs) 4 3 2 1 0.19 cfs 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 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 73 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 2-Year Rainfall=3.44" 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 0.01 0.02 0.03 0.05 0.11 1.86 0.34 0.19 0.13 0.11 0.10 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 13 129 332 646 1,171 3,984 11,941 12,419 12,241 11,937 11,687 11,462 10,872 10,474 10,204 10,019 9,886 9,778 9,690 9,619 9,560 9,513 9,474 9,443 9,417 9,396 9,379 9,366 9,354 9,345 9,338 9,332 9,327 9,323 9,320 9,317 9,315 9,313 9,311 9,310 Elevation (feet) 544.50 544.50 544.50 544.51 544.52 544.54 544.65 544.95 544.96 544.96 544.95 544.94 544.93 544.91 544.89 544.88 544.88 544.87 544.87 544.86 544.86 544.86 544.86 544.86 544.86 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 544.85 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 0.19 0.17 0.15 0.13 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 0.00 Printed 10/25/2024 Page 74

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" 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 75

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" 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 76

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 77 Summary for Pond 33P: Basin 11 Inflow Area = 84,103 sf, 71.22% Impervious, Inflow Depth = 2.66" for 2-Year event Inflow = 4.62 cfs @ 12.17 hrs, Volume= 18,673 cf Outflow = 3.23 cfs @ 12.26 hrs, Volume= 18,673 cf, Atten= 30%, Lag= 5.7 min Discarded = 3.13 cfs @ 12.12 hrs, Volume= 18,638 cf Primary = 0.10 cfs @ 12.26 hrs, Volume= 35 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= 590.13' @ 12.26 hrs Surf.Area= 13,504 sf Storage= 717 cf Plug-Flow detention time= 1.1 min calculated for 18,664 cf (100% of inflow) Center-of-Mass det. time= 1.1 min ( 776.6 - 775.5 ) 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 @ 12.12 hrs HW=590.04' (Free Discharge) 2=Exfiltration (Exfiltration Controls 3.13 cfs) Primary OutFlow Max=0.09 cfs @ 12.26 hrs HW=590.13' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 0.09 cfs @ 0.57 fps) Pond 33P: Basin 11 Sharp-Crested Rectangular Exfiltration Weir

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 78 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 33P: Basin 11 Hydrograph 4.62 cfs Inflow Area=84,103 sf Peak Elev=590.13' Storage=717 cf 5 4 Inflow Outflow Discarded Primary 3.23 cfs Flow (cfs) 3.13 cfs 3 2 1 0.10 cfs 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 2-Year Rainfall=3.44" Printed 10/25/2024 Page 79 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 2-Year Rainfall=3.44" Printed 10/25/2024 Page 80 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 0.02 0.05 0.07 0.11 0.20 2.17 0.30 0.17 0.11 0.09 0.08 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2 3 5 8 86 13 7 5 4 3 3 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) 590.00 590.00 590.00 590.00 590.00 590.00 590.02 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 590.00 Outflow (cfs) 0.00 0.02 0.05 0.07 0.11 0.20 2.05 0.30 0.17 0.11 0.09 0.08 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.02 0.05 0.07 0.11 0.20 2.05 0.30 0.17 0.11 0.09 0.08 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 2-Year Rainfall=3.44" 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 81