complete drainage report rev 9

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 40 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 18P: Basin 5 Elevation (feet) 579.00 579.10 579.20 579.30 579.40 579.50 579.60 579.70 579.80 579.90 580.00 580.10 580.20 580.30 580.40 580.50 580.60 580.70 580.80 580.90 581.00 581.10 581.20 581.30 581.40 581.50 581.60 581.70 581.80 581.90 582.00 582.10 582.20 582.30 582.40 582.50 582.60 582.70 582.80 582.90 583.00 583.10 583.20 583.30 583.40 583.50 583.60 583.70 583.80 583.90 584.00 Surface (sq-ft) 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 14,810 Storage (cubic-feet) 0 592 1,185 1,777 2,370 2,962 3,554 4,147 4,739 5,332 5,924 6,516 7,109 7,701 8,294 8,886 9,478 10,071 10,663 11,256 11,848 12,440 13,033 13,625 14,218 14,810 15,402 15,995 16,587 17,180 17,772 18,364 18,957 19,549 20,142 20,734 21,326 21,919 22,511 23,104 23,696 24,288 24,881 25,473 26,066 26,658 27,250 27,843 28,435 29,028 29,620 Elevation (feet) 584.10 584.20 584.30 Surface (sq-ft) 14,810 14,810 14,810 Storage (cubic-feet) 30,212 30,805 31,397

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 41 Summary for Pond 24P: Basin 6 Inflow Area = 108,077 sf, 52.61% Impervious, Inflow Depth = 2.26" for 2-Year event Inflow = 6.37 cfs @ 12.11 hrs, Volume= 20,310 cf Outflow = 6.35 cfs @ 12.12 hrs, Volume= 20,310 cf, Atten= 0%, Lag= 0.4 min Discarded = 6.35 cfs @ 12.12 hrs, Volume= 20,310 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 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= 600.01' @ 12.12 hrs Surf.Area= 35,719 sf Storage= 156 cf Plug-Flow detention time= 0.4 min calculated for 20,307 cf (100% of inflow) Center-of-Mass det. time= 0.4 min ( 783.5 - 783.1 ) Volume #1 Invert 600.00' Elevation (feet) 600.00 601.00 601.42 Device #1 #2 Avail.Storage 20,288 cf Surf.Area (sq-ft) 35,719 35,719 35,719 Routing Primary Discarded Invert 600.02' 600.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 50,721 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 35,719 15,002 Cum.Store (cubic-feet) 0 35,719 50,721 Outlet Devices 6.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=8.27 cfs @ 12.12 hrs HW=600.01' (Free Discharge) 2=Exfiltration (Exfiltration Controls 8.27 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=600.00' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 24P: Basin 6 Sharp-Crested Rectangular Exfiltration Weir

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 42 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 24P: Basin 6 Hydrograph 6.37 cfs Inflow Area=108,077 sf Peak Elev=600.01' Storage=156 cf 6.35 cfs 7 6.35 cfs 6 Inflow Outflow Discarded Primary Flow (cfs) 5 4 3 2 1 0.00 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 Time (hours) Pond 24P: Basin 6 Stage-Discharge Total Discarded Primary Elevation (feet) 601 Exfiltration Sharp-Crested Rectangular Weir 600 0 5 10 15 20 Discharge (cfs) 25 30 35

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 43 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 24P: Basin 6 Stage-Area-Storage 0 5,000 10,000 Surface/Horizontal/Wetted Area (sq-ft) 15,000 20,000 25,000 30,000 35,000 Elevation (feet) 601 Custom Stage Data 600 0 2,000 4,000 6,000 8,000 10,000 12,000 Storage (cubic-feet) 14,000 16,000 18,000 20,000 Surface Storage

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 44 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Pond 24P: Basin 6 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 0.02 0.04 0.06 0.11 0.20 3.57 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 Storage (cubic-feet) 0 0 1 2 3 5 86 8 5 3 3 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 Elevation (feet) 600.00 600.00 600.00 600.00 600.00 600.00 600.01 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 600.00 Outflow (cfs) 0.00 0.02 0.04 0.06 0.11 0.20 3.52 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 Discarded (cfs) 0.00 0.02 0.04 0.06 0.11 0.20 3.52 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 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

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 45 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Discharge for Pond 24P: Basin 6 Elevation (feet) 600.00 600.02 600.04 600.06 600.08 600.10 600.12 600.14 600.16 600.18 600.20 600.22 600.24 600.26 600.28 600.30 600.32 600.34 600.36 600.38 600.40 600.42 600.44 600.46 600.48 600.50 600.52 600.54 600.56 600.58 600.60 600.62 600.64 600.66 600.68 600.70 600.72 600.74 600.76 600.78 600.80 600.82 600.84 600.86 600.88 600.90 600.92 600.94 600.96 600.98 601.00 Discharge (cfs) 0.00 8.27 8.32 8.43 8.56 8.71 8.89 9.08 9.29 9.52 9.76 10.01 10.28 10.56 10.85 11.15 11.46 11.78 12.11 12.46 12.81 13.17 13.53 13.91 14.30 14.69 15.09 15.50 15.91 16.34 16.77 17.20 17.65 18.10 18.56 19.02 19.49 19.97 20.45 20.94 21.43 21.93 22.44 22.95 23.47 23.99 24.52 25.05 25.59 26.13 26.68 Discarded (cfs) 0.00 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 Primary (cfs) 0.00 0.00 0.06 0.16 0.29 0.44 0.62 0.81 1.02 1.25 1.49 1.74 2.01 2.29 2.58 2.88 3.19 3.51 3.85 4.19 4.54 4.90 5.27 5.64 6.03 6.42 6.82 7.23 7.65 8.07 8.50 8.94 9.38 9.83 10.29 10.75 11.22 11.70 12.18 12.67 13.16 13.66 14.17 14.68 15.20 15.72 16.25 16.78 17.32 17.86 18.41 Elevation (feet) 601.02 601.04 601.06 601.08 601.10 601.12 601.14 601.16 601.18 601.20 601.22 601.24 601.26 601.28 601.30 601.32 601.34 601.36 601.38 601.40 601.42 Discharge (cfs) 27.23 27.79 28.36 28.92 29.50 30.07 30.66 31.24 31.83 32.43 33.03 33.63 34.24 34.85 35.47 36.09 36.71 37.34 37.98 38.61 39.25 Discarded (cfs) 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 8.27 Primary (cfs) 18.97 19.52 20.09 20.66 21.23 21.81 22.39 22.97 23.56 24.16 24.76 25.36 25.97 26.58 27.20 27.82 28.45 29.07 29.71 30.34 30.98

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Printed 10/25/2024 Page 46 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Stage-Area-Storage for Pond 24P: Basin 6 Elevation (feet) 600.00 600.02 600.04 600.06 600.08 600.10 600.12 600.14 600.16 600.18 600.20 600.22 600.24 600.26 600.28 600.30 600.32 600.34 600.36 600.38 600.40 600.42 600.44 600.46 600.48 600.50 600.52 600.54 600.56 600.58 600.60 600.62 600.64 600.66 600.68 600.70 600.72 600.74 600.76 600.78 600.80 600.82 600.84 600.86 600.88 600.90 600.92 600.94 600.96 600.98 601.00 Surface (sq-ft) 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 Storage (cubic-feet) 0 286 572 857 1,143 1,429 1,715 2,000 2,286 2,572 2,858 3,143 3,429 3,715 4,001 4,286 4,572 4,858 5,144 5,429 5,715 6,001 6,287 6,572 6,858 7,144 7,430 7,715 8,001 8,287 8,573 8,858 9,144 9,430 9,716 10,001 10,287 10,573 10,859 11,144 11,430 11,716 12,002 12,287 12,573 12,859 13,145 13,430 13,716 14,002 14,288 Elevation (feet) 601.02 601.04 601.06 601.08 601.10 601.12 601.14 601.16 601.18 601.20 601.22 601.24 601.26 601.28 601.30 601.32 601.34 601.36 601.38 601.40 601.42 Surface (sq-ft) 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 35,719 Storage (cubic-feet) 14,573 14,859 15,145 15,431 15,716 16,002 16,288 16,574 16,859 17,145 17,431 17,717 18,002 18,288 18,574 18,860 19,145 19,431 19,717 20,003 20,288

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 47 Summary for Link 25L: POA 1 Inflow Area = Inflow = Primary = 481,833 sf, 51.45% Impervious, Inflow Depth > 1.09" for 2-Year event 2.36 cfs @ 12.15 hrs, Volume= 43,958 cf 2.36 cfs @ 12.15 hrs, Volume= 43,958 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Link 25L: POA 1 Hydrograph Inflow Primary 2.36 cfs 2.36 cfs Inflow Area=481,833 sf Flow (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 Time (hours)

POA-1 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 48 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Hydrograph for Link 25L: POA 1 Time (hours) 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 26.00 27.00 28.00 29.00 30.00 31.00 32.00 33.00 34.00 35.00 36.00 37.00 38.00 39.00 40.00 41.00 42.00 43.00 44.00 45.00 46.00 47.00 48.00 49.00 50.00 Inflow (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.07 1.01 0.94 0.91 0.86 0.80 0.74 0.67 0.62 0.57 0.52 0.48 0.45 0.42 0.32 0.28 0.24 0.21 0.18 0.16 0.15 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.03 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 0.01 0.07 1.01 0.94 0.91 0.86 0.80 0.74 0.67 0.62 0.57 0.52 0.48 0.45 0.42 0.32 0.28 0.24 0.21 0.18 0.16 0.15 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.07 0.06 0.06 0.06 0.05 0.05 0.04 0.04 0.04 0.04 0.04 0.03 Time (hours) 51.00 52.00 53.00 54.00 55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 71.00 72.00 Inflow (cfs) 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01 Elevation (feet) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 0.03 0.03 0.03 0.03 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.01 0.01

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 49 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 14S: Basin 1 - Imp Runoff Area=147,571 sf 100.00% Impervious Runoff Depth=4.98" Flow Length=1,000' Tc=14.1 min CN=98 Runoff=12.98 cfs 61,277 cf Subcatchment 15S: Basin 1 - Perv Runoff Area=114,590 sf 0.00% Impervious Runoff Depth=2.81" Flow Length=1,000' Tc=14.1 min CN=77 Runoff=6.53 cfs 26,815 cf Runoff Area=43,168 sf 100.00% Impervious Runoff Depth=4.98" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=98 Runoff=5.42 cfs 17,925 cf Subcatchment 17S: Basin 5 - Imp Runoff Area=56,858 sf 100.00% Impervious Runoff Depth=4.98" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=98 Runoff=6.99 cfs 23,610 cf Subcatchment 22S: Basin 6 - Imp Runoff Area=51,219 sf 0.00% Impervious Runoff Depth=2.54" Flow Length=490' Slope=0.0200 '/' Tc=3.6 min CN=74 Runoff=3.84 cfs 10,845 cf Subcatchment 23S: Basin 6 - Perv Runoff Area=64,687 sf 0.00% Impervious Runoff Depth=2.81" Flow Length=150' Slope=0.1100 '/' Tc=7.1 min CN=77 Runoff=4.71 cfs 15,137 cf Subcatchment 26S: DA 1 Und - Perv Runoff Area=3,440 sf 0.00% Impervious Runoff Depth=2.54" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=74 Runoff=0.27 cfs 728 cf Subcatchment 27S: Basin 5 - Perv Subcatchment 28S: undetained impervious Runoff Area=300 sf 100.00% Impervious Runoff Depth=4.98" Tc=0.0 min CN=98 Runoff=0.04 cfs 125 cf Pond 16P: Basin 1 Peak Elev=544.64' Storage=51,866 cf Inflow=20.44 cfs 89,159 cf Outflow=3.24 cfs 72,781 cf Pond 18P: Basin 5 Peak Elev=579.44' Storage=2,595 cf Inflow=5.69 cfs 18,653 cf Discarded=1.37 cfs 17,616 cf Primary=1.06 cfs 1,038 cf Outflow=2.43 cfs 18,653 cf Pond 24P: Basin 6 Peak Elev=600.05' Storage=784 cf Inflow=10.83 cfs 34,455 cf Discarded=8.27 cfs 34,425 cf Primary=0.13 cfs 30 cf Outflow=8.40 cfs 34,455 cf Link 25L: POA 1 Inflow=5.27 cfs 88,042 cf Primary=5.27 cfs 88,042 cf Total Runoff Area = 481,833 sf Runoff Volume = 156,462 cf Average Runoff Depth = 3.90" 48.55% Pervious = 233,936 sf 51.45% Impervious = 247,897 sf