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 270 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 21P: Basin 3 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 0.02 0.05 0.11 1.55 0.20 0.11 0.07 0.06 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0 1 1 2 4 73 7 4 3 2 2 2 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) 559.00 559.00 559.00 559.00 559.00 559.00 559.03 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 Outflow (cfs) 0.00 0.01 0.02 0.02 0.05 0.11 1.21 0.20 0.11 0.07 0.06 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.01 0.02 0.02 0.05 0.11 1.21 0.20 0.11 0.07 0.06 0.05 0.05 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 21P: Basin 3 Elevation (feet) 559.00 559.05 559.10 559.15 559.20 559.25 559.30 559.35 559.40 559.45 559.50 559.55 559.60 559.65 559.70 559.75 559.80 559.85 559.90 559.95 560.00 560.05 560.10 560.15 560.20 560.25 560.30 560.35 560.40 560.45 560.50 560.55 560.60 560.65 560.70 560.75 560.80 560.85 560.90 560.95 561.00 561.05 561.10 561.15 Discharge (cfs) 0.00 1.21 1.21 1.21 1.21 1.28 1.50 1.82 2.20 2.64 3.12 3.65 4.22 4.82 5.46 6.12 6.82 7.54 8.30 9.07 9.87 10.69 11.53 12.40 13.28 14.18 15.10 16.03 16.99 17.96 18.94 19.94 20.95 21.98 23.02 24.07 25.14 26.21 27.30 28.40 29.51 30.63 31.76 32.90 Discarded (cfs) 0.00 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 1.21 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.07 0.29 0.61 0.99 1.43 1.91 2.44 3.01 3.61 4.25 4.91 5.61 6.33 7.09 7.86 8.66 9.48 10.32 11.19 12.07 12.97 13.89 14.82 15.78 16.75 17.73 18.73 19.74 20.77 21.81 22.86 23.93 25.00 26.09 27.19 28.30 29.42 30.55 31.69 Printed 10/25/2024 Page 271

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 21P: Basin 3 Elevation (feet) 559.00 559.05 559.10 559.15 559.20 559.25 559.30 559.35 559.40 559.45 559.50 559.55 559.60 559.65 559.70 559.75 559.80 559.85 559.90 559.95 560.00 560.05 560.10 560.15 560.20 560.25 560.30 560.35 560.40 560.45 560.50 560.55 560.60 560.65 560.70 560.75 560.80 560.85 560.90 560.95 561.00 561.05 561.10 561.15 Surface (sq-ft) 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 5,227 Storage (cubic-feet) 0 105 209 314 418 523 627 732 836 941 1,045 1,150 1,254 1,359 1,464 1,568 1,673 1,777 1,882 1,986 2,091 2,195 2,300 2,404 2,509 2,614 2,718 2,823 2,927 3,032 3,136 3,241 3,345 3,450 3,554 3,659 3,763 3,868 3,973 4,077 4,182 4,286 4,391 4,495 Printed 10/25/2024 Page 272

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 273 Summary for Pond 22P: Basin 4 Inflow Area = 49,050 sf, 84.66% Impervious, Inflow Depth = 7.97" for 100-Year event Inflow = 9.06 cfs @ 12.12 hrs, Volume= 32,597 cf Outflow = 1.94 cfs @ 12.43 hrs, Volume= 32,597 cf, Atten= 79%, Lag= 18.4 min Discarded = 1.13 cfs @ 11.48 hrs, Volume= 28,845 cf Primary = 0.81 cfs @ 12.43 hrs, Volume= 3,752 cf Routed to Pond 27P : Basin 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 573.49' @ 12.43 hrs Surf.Area= 12,197 sf Storage= 7,284 cf Plug-Flow detention time= 24.8 min calculated for 32,581 cf (100% of inflow) Center-of-Mass det. time= 24.7 min ( 773.8 - 749.0 ) Volume #1 Invert 572.00' Elevation (feet) 572.00 573.00 574.00 574.91 Device #1 #2 #3 Avail.Storage 14,197 cf Surf.Area (sq-ft) 12,197 12,197 12,197 12,197 Routing Primary Primary Discarded Invert 574.00' 572.50' 572.00' Storage Description Custom Stage Data (Prismatic) Listed below 35,493 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 12,197 12,197 11,099 Cum.Store (cubic-feet) 0 12,197 24,394 35,493 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 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=1.13 cfs @ 11.48 hrs HW=572.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 1.13 cfs) Primary OutFlow Max=0.81 cfs @ 12.43 hrs HW=573.49' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.81 cfs @ 4.15 fps) Pond 22P: Basin 4 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 274 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 22P: Basin 4 Hydrograph 9.06 cfs Inflow Area=49,050 sf Peak Elev=573.49' Storage=7,284 cf 10 9 8 Inflow Outflow Discarded Primary Flow (cfs) 7 6 5 4 1.94 cfs 3 2 1.13 cfs 0.81 cfs 1 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 22P: Basin 4 Stage-Discharge Total Discarded Primary Sharp-Crested Rectangular Weir Elevation (feet) 574 573 Orifice Exfiltration 572 0 1 2 3 4 5 6 7 8 Discharge (cfs) 9 10 11 12 13

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 275 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 100-Year Rainfall=8.66" Printed 10/25/2024 Page 276 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 0.07 0.11 0.14 0.22 0.41 5.13 0.47 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 9 14 17 28 50 2,239 3,005 33 22 19 16 13 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) 572.00 572.00 572.00 572.00 572.01 572.01 572.46 572.62 572.01 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 572.00 Outflow (cfs) 0.00 0.07 0.11 0.14 0.22 0.40 1.13 1.17 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.11 0.14 0.22 0.40 1.13 1.13 0.26 0.18 0.15 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 277 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 100-Year Rainfall=8.66" Printed 10/25/2024 Page 278 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 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 279 Summary for Pond 27P: Basin 2 Inflow Area = 183,393 sf, 42.82% Impervious, Inflow Depth = 4.32" for 100-Year event Inflow = 17.10 cfs @ 12.19 hrs, Volume= 66,008 cf Outflow = 5.38 cfs @ 12.50 hrs, Volume= 56,696 cf, Atten= 69%, Lag= 18.5 min Primary = 5.38 cfs @ 12.50 hrs, Volume= 56,696 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= 545.62' @ 12.50 hrs Surf.Area= 29,623 sf Storage= 31,128 cf Plug-Flow detention time= 260.9 min calculated for 56,696 cf (86% of inflow) Center-of-Mass det. time= 195.4 min ( 986.5 - 791.1 ) 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=5.36 cfs @ 12.50 hrs HW=545.62' (Free Discharge) 1=Grate (Weir Controls 2.00 cfs @ 1.13 fps) 2=Sharp-Crested Rectangular Weir (Weir Controls 3.36 cfs @ 3.25 fps) Pond 27P: Basin 2 Grate Sharp-Crested Rectangular Weir