complete drainage report rev 9

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 Subcatchment 28S: undetained impervious Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.06 0.00 2.00 0.13 0.02 3.00 0.20 0.07 4.00 0.27 0.12 5.00 0.36 0.19 6.00 0.45 0.27 7.00 0.55 0.36 8.00 0.68 0.48 9.00 0.83 0.63 10.00 1.03 0.82 11.00 1.36 1.14 12.00 2.50 2.27 13.00 3.86 3.63 14.00 4.19 3.95 15.00 4.39 4.16 16.00 4.54 4.31 17.00 4.67 4.43 18.00 4.77 4.54 19.00 4.86 4.63 20.00 4.95 4.71 21.00 5.02 4.79 22.00 5.09 4.86 23.00 5.16 4.92 24.00 5.22 4.98 25.00 5.22 4.98 26.00 5.22 4.98 27.00 5.22 4.98 28.00 5.22 4.98 29.00 5.22 4.98 30.00 5.22 4.98 31.00 5.22 4.98 32.00 5.22 4.98 33.00 5.22 4.98 34.00 5.22 4.98 35.00 5.22 4.98 36.00 5.22 4.98 37.00 5.22 4.98 38.00 5.22 4.98 39.00 5.22 4.98 40.00 5.22 4.98 41.00 5.22 4.98 42.00 5.22 4.98 43.00 5.22 4.98 44.00 5.22 4.98 45.00 5.22 4.98 46.00 5.22 4.98 47.00 5.22 4.98 48.00 5.22 4.98 49.00 5.22 4.98 50.00 5.22 4.98 Runoff (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 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 5.22 4.98 52.00 5.22 4.98 53.00 5.22 4.98 54.00 5.22 4.98 55.00 5.22 4.98 56.00 5.22 4.98 57.00 5.22 4.98 58.00 5.22 4.98 59.00 5.22 4.98 60.00 5.22 4.98 61.00 5.22 4.98 62.00 5.22 4.98 63.00 5.22 4.98 64.00 5.22 4.98 65.00 5.22 4.98 66.00 5.22 4.98 67.00 5.22 4.98 68.00 5.22 4.98 69.00 5.22 4.98 70.00 5.22 4.98 71.00 5.22 4.98 72.00 5.22 4.98 Runoff (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 Printed 10/25/2024 Page 70

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 71 Summary for Pond 16P: Basin 1 Inflow Area = 416,846 sf, 59.40% Impervious, Inflow Depth = 2.57" for 10-Year event Inflow = 20.44 cfs @ 12.21 hrs, Volume= 89,159 cf Outflow = 3.24 cfs @ 12.98 hrs, Volume= 72,781 cf, Atten= 84%, Lag= 45.8 min Primary = 3.24 cfs @ 12.98 hrs, Volume= 72,781 cf Routed to Link 25L : POA 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 544.64' @ 12.98 hrs Surf.Area= 46,729 sf Storage= 51,866 cf Plug-Flow detention time= 520.3 min calculated for 72,771 cf (82% of inflow) Center-of-Mass det. time= 439.8 min ( 1,222.3 - 782.5 ) Volume #1 Invert 543.50' Elevation (feet) 543.50 544.00 545.00 546.00 547.00 Avail.Storage 170,585 cf Surf.Area (sq-ft) 42,000 45,955 47,156 51,115 54,695 Device #1 Routing Primary Invert 546.00' #2 #3 Primary Primary 543.82' 544.40' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 21,989 46,556 49,136 52,905 Cum.Store (cubic-feet) 0 21,989 68,544 117,680 170,585 Outlet Devices 42.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 10.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 48.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.24 cfs @ 12.98 hrs HW=544.64' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 1.68 cfs @ 3.09 fps) 3=Orifice/Grate (Orifice Controls 1.55 cfs @ 1.59 fps) Pond 16P: Basin 1 Grate Orifice/Grate Orifice

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 1B-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 16P: Basin 1 Flow (cfs) Hydrograph Inflow Primary 20.44 cfs 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=416,846 sf Peak Elev=544.64' Storage=51,866 cf 3.24 cfs 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 Time (hours) Pond 16P: Basin 1 Stage-Discharge 547 Primary Grate Elevation (feet) 546 545 Orifice/Grate 544 Orifice 0 5 10 15 20 25 30 35 40 Discharge (cfs) 45 50 55 60 65 70

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 1B-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 16P: Basin 1 Stage-Area-Storage 0 5,000 10,000 15,000 Surface/Horizontal/Wetted Area (sq-ft) 20,000 25,000 30,000 35,000 40,000 45,000 50,000 547 Elevation (feet) 546 545 544 Custom Stage Data 0 20,000 40,000 60,000 80,000 100,000 Storage (cubic-feet) 120,000 140,000 160,000 Surface Storage

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 16P: Basin 1 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 Inflow (cfs) 0.00 0.10 0.21 0.27 0.44 0.89 8.04 1.47 0.80 0.55 0.46 0.39 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 0 220 1,364 3,095 5,595 9,950 25,663 48,806 43,005 39,608 36,646 34,341 32,434 29,169 26,676 24,840 23,439 22,341 21,460 20,733 20,127 19,618 19,179 18,798 18,469 18,182 17,924 17,692 17,483 17,294 17,124 16,971 16,833 16,708 16,592 16,482 16,379 Elevation (feet) 543.50 543.51 543.53 543.57 543.63 543.73 544.08 544.58 544.45 544.38 544.32 544.27 544.23 544.16 544.10 544.06 544.03 544.01 543.99 543.97 543.96 543.95 543.94 543.93 543.92 543.92 543.91 543.91 543.90 543.90 543.89 543.89 543.89 543.88 543.88 543.88 543.88 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.25 2.52 1.38 1.00 0.82 0.68 0.57 0.41 0.29 0.22 0.17 0.14 0.11 0.09 0.08 0.07 0.06 0.05 0.04 0.04 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 Printed 10/25/2024 Page 74

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 75 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 16P: Basin 1 Elevation (feet) 543.50 543.52 543.54 543.56 543.58 543.60 543.62 543.64 543.66 543.68 543.70 543.72 543.74 543.76 543.78 543.80 543.82 543.84 543.86 543.88 543.90 543.92 543.94 543.96 543.98 544.00 544.02 544.04 544.06 544.08 544.10 544.12 544.14 544.16 544.18 544.20 544.22 544.24 544.26 544.28 544.30 544.32 544.34 544.36 544.38 544.40 544.42 544.44 544.46 544.48 544.50 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 0.01 0.01 0.03 0.04 0.06 0.08 0.10 0.13 0.15 0.18 0.22 0.25 0.29 0.33 0.37 0.42 0.46 0.51 0.56 0.61 0.66 0.71 0.77 0.82 0.88 0.94 0.99 1.05 1.15 1.27 1.41 1.57 1.74 Elevation (feet) 544.52 544.54 544.56 544.58 544.60 544.62 544.64 544.66 544.68 544.70 544.72 544.74 544.76 544.78 544.80 544.82 544.84 544.86 544.88 544.90 544.92 544.94 544.96 544.98 545.00 545.02 545.04 545.06 545.08 545.10 545.12 545.14 545.16 545.18 545.20 545.22 545.24 545.26 545.28 545.30 545.32 545.34 545.36 545.38 545.40 545.42 545.44 545.46 545.48 545.50 545.52 Primary (cfs) 1.93 2.12 2.32 2.53 2.74 2.96 3.19 3.41 3.65 3.90 4.15 4.41 4.67 4.94 5.22 5.50 5.79 6.08 6.38 6.68 6.99 7.30 7.61 7.94 8.26 8.59 8.93 9.27 9.59 9.88 10.15 10.41 10.66 10.91 11.14 11.37 11.59 11.81 12.02 12.22 12.43 12.63 12.82 13.01 13.20 13.39 13.57 13.75 13.93 14.10 14.28 Elevation (feet) 545.54 545.56 545.58 545.60 545.62 545.64 545.66 545.68 545.70 545.72 545.74 545.76 545.78 545.80 545.82 545.84 545.86 545.88 545.90 545.92 545.94 545.96 545.98 546.00 546.02 546.04 546.06 546.08 546.10 546.12 546.14 546.16 546.18 546.20 546.22 546.24 546.26 546.28 546.30 546.32 546.34 546.36 546.38 546.40 546.42 546.44 546.46 546.48 546.50 546.52 546.54 Primary (cfs) 14.45 14.61 14.78 14.94 15.11 15.27 15.42 15.58 15.74 15.89 16.04 16.19 16.34 16.49 16.64 16.78 16.92 17.07 17.21 17.35 17.49 17.62 17.76 17.90 18.17 18.56 19.02 19.54 20.11 20.73 21.39 22.08 22.82 23.58 24.38 25.21 26.07 26.96 27.87 28.81 29.78 30.77 31.78 32.82 33.88 34.96 36.06 37.19 38.33 39.50 40.68 Elevation (feet) 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.

29.78 30.77 31.78 32.82 33.88 34.96 36.06 37.19 38.33 39.50 40.68 Elevation (feet) 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) 41.89 43.11 44.35 45.61 46.89 48.19 49.50 50.83 52.18 53.55 54.93 56.33 57.74 59.17 60.62 62.08 63.55 65.05 66.55 68.08 69.61 71.16 72.73

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Printed 10/25/2024 Page 76 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 16P: Basin 1 Elevation (feet) 543.50 543.55 543.60 543.65 543.70 543.75 543.80 543.85 543.90 543.95 544.00 544.05 544.10 544.15 544.20 544.25 544.30 544.35 544.40 544.45 544.50 544.55 544.60 544.65 544.70 544.75 544.80 544.85 544.90 544.95 545.00 545.05 545.10 545.15 545.20 545.25 545.30 545.35 545.40 545.45 545.50 545.55 545.60 545.65 545.70 545.75 545.80 545.85 545.90 545.95 546.00 Surface (sq-ft) 42,000 42,395 42,791 43,186 43,582 43,978 44,373 44,769 45,164 45,560 45,955 46,015 46,075 46,135 46,195 46,255 46,315 46,375 46,435 46,495 46,556 46,616 46,676 46,736 46,796 46,856 46,916 46,976 47,036 47,096 47,156 47,354 47,552 47,750 47,948 48,146 48,344 48,542 48,740 48,938 49,136 49,333 49,531 49,729 49,927 50,125 50,323 50,521 50,719 50,917 51,115 Storage (cubic-feet) 0 2,110 4,240 6,389 8,558 10,747 12,956 15,184 17,433 19,701 21,989 24,288 26,590 28,896 31,204 33,515 35,829 38,147 40,467 42,790 45,116 47,446 49,778 52,113 54,451 56,793 59,137 61,484 63,835 66,188 68,544 70,907 73,280 75,662 78,055 80,457 82,869 85,291 87,723 90,165 92,617 95,079 97,550 100,032 102,523 105,025 107,536 110,057 112,588 115,129 117,680 Elevation (feet) 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) 51,294 51,473 51,652 51,831 52,010 52,189 52,368 52,547 52,726 52,905 53,084 53,263 53,442 53,621 53,800 53,979 54,158 54,337 54,516 54,695 Storage (cubic-feet) 120,240 122,809 125,387 127,974 130,570 133,175 135,789 138,412 141,044 143,685 146,334 148,993 151,661 154,337 157,023 159,717 162,421 165,133 167,854 170,585

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 77 Summary for Pond 18P: Basin 5 Inflow Area = 46,608 sf, 92.62% Impervious, Inflow Depth = 4.80" for 10-Year event Inflow = 5.69 cfs @ 12.10 hrs, Volume= 18,653 cf Outflow = 2.43 cfs @ 12.14 hrs, Volume= 18,653 cf, Atten= 57%, Lag= 2.7 min Discarded = 1.37 cfs @ 11.84 hrs, Volume= 17,616 cf Primary = 1.06 cfs @ 12.14 hrs, Volume= 1,038 cf Routed to Pond 16P : Basin 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 579.44' @ 12.14 hrs Surf.Area= 14,810 sf Storage= 2,595 cf Plug-Flow detention time= 8.1 min calculated for 18,651 cf (100% of inflow) Center-of-Mass det. time= 8.1 min ( 756.5 - 748.4 ) Volume #1 Invert 579.00' Elevation (feet) 579.00 580.00 581.00 582.00 583.00 584.00 584.30 Device #1 #2 Avail.Storage 31,397 cf Surf.Area (sq-ft) 14,810 14,810 14,810 14,810 14,810 14,810 14,810 Routing Primary Discarded Invert 579.25' 579.00' Storage Description Custom Stage Data (Prismatic) Listed below 78,493 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 14,810 14,810 14,810 14,810 14,810 4,443 Cum.Store (cubic-feet) 0 14,810 29,620 44,430 59,240 74,050 78,493 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=1.37 cfs @ 11.84 hrs HW=579.06' (Free Discharge) 2=Exfiltration (Exfiltration Controls 1.37 cfs) Primary OutFlow Max=1.05 cfs @ 12.14 hrs HW=579.44' (Free Discharge) 1=Sharp-Crested Rectangular Weir (Weir Controls 1.05 cfs @ 1.42 fps) Pond 18P: Basin 5 Sharp-Crested Rectangular Exfiltration Weir

POA-1 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 1B-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 18P: Basin 5 Hydrograph 5.69 cfs Inflow Area=46,608 sf Peak Elev=579.44' Storage=2,595 cf 6 5 Inflow Outflow Discarded Primary Flow (cfs) 4 2.43 cfs 3 2 1.37 cfs 1.06 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 Time (hours) Pond 18P: Basin 5 Stage-Discharge Total Discarded Primary 584 Elevation (feet) 583 582 581 580 Sharp-Crested Exfiltration Rectangular Weir 579 0 10 20 30 40 50 60 Discharge (cfs) 70 80 90 100 110