complete drainage report rev 9

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 Subcatchment 54S: Basin 9 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 0.80 0.05 0.00 1.60 0.10 0.00 2.40 0.15 0.00 3.20 0.21 0.00 4.00 0.27 0.00 4.80 0.34 0.00 5.60 0.41 0.00 6.40 0.48 0.00 7.20 0.57 0.00 8.00 0.68 0.00 8.80 0.80 0.02 9.60 0.94 0.04 10.40 1.14 0.10 11.20 1.46 0.22 12.00 2.50 0.79 12.80 3.76 1.70 13.60 4.08 1.95 14.40 4.28 2.11 15.20 4.42 2.23 16.00 4.54 2.33 16.80 4.65 2.41 17.60 4.74 2.49 18.40 4.81 2.55 19.20 4.88 2.61 20.00 4.95 2.67 20.80 5.01 2.72 21.60 5.07 2.77 22.40 5.12 2.82 23.20 5.17 2.86 24.00 5.22 2.90 24.80 5.22 2.90 25.60 5.22 2.90 26.40 5.22 2.90 27.20 5.22 2.90 28.00 5.22 2.90 28.80 5.22 2.90 29.60 5.22 2.90 30.40 5.22 2.90 31.20 5.22 2.90 32.00 5.22 2.90 32.80 5.22 2.90 33.60 5.22 2.90 34.40 5.22 2.90 35.20 5.22 2.90 36.00 5.22 2.90 36.80 5.22 2.90 37.60 5.22 2.90 38.40 5.22 2.90 39.20 5.22 2.90 40.00 5.22 2.90 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 0.01 0.02 0.04 0.31 0.10 0.05 0.04 0.03 0.02 0.02 0.02 0.02 0.01 0.01 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 0.00 0.00 Time Precip. Excess (hours) (inches)

04 0.03 0.02 0.02 0.02 0.02 0.01 0.01 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 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 40.80 5.22 2.90 41.60 5.22 2.90 42.40 5.22 2.90 43.20 5.22 2.90 44.00 5.22 2.90 44.80 5.22 2.90 45.60 5.22 2.90 46.40 5.22 2.90 47.20 5.22 2.90 48.00 5.22 2.90 48.80 5.22 2.90 49.60 5.22 2.90 50.40 5.22 2.90 51.20 5.22 2.90 52.00 5.22 2.90 52.80 5.22 2.90 53.60 5.22 2.90 54.40 5.22 2.90 55.20 5.22 2.90 56.00 5.22 2.90 56.80 5.22 2.90 57.60 5.22 2.90 58.40 5.22 2.90 59.20 5.22 2.90 60.00 5.22 2.90 60.80 5.22 2.90 61.60 5.22 2.90 62.40 5.22 2.90 63.20 5.22 2.90 64.00 5.22 2.90 64.80 5.22 2.90 65.60 5.22 2.90 66.40 5.22 2.90 67.20 5.22 2.90 68.00 5.22 2.90 68.80 5.22 2.90 69.60 5.22 2.90 70.40 5.22 2.90 71.20 5.22 2.90 72.00 5.22 2.90 72.80 5.22 2.90 73.60 5.22 2.90 74.40 5.22 2.90 75.20 5.22 2.90 76.00 5.22 2.90 76.80 5.22 2.90 77.60 5.22 2.90 78.40 5.22 2.90 79.20 5.22 2.90 80.00 5.22 2.90 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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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 162

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 163 Summary for Pond 21P: Basin 3 Inflow Area = 21,910 sf, 31.15% Impervious, Inflow Depth = 3.30" for 10-Year event Inflow = 1.65 cfs @ 12.16 hrs, Volume= 6,028 cf Outflow = 1.21 cfs @ 12.12 hrs, Volume= 6,028 cf, Atten= 27%, Lag= 0.0 min Discarded = 1.21 cfs @ 12.12 hrs, Volume= 6,028 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 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= 559.09' @ 12.23 hrs Surf.Area= 5,227 sf Storage= 183 cf Plug-Flow detention time= 0.8 min calculated for 6,025 cf (100% of inflow) Center-of-Mass det. time= 0.8 min ( 803.0 - 802.2 ) Volume #1 Invert 559.00' Elevation (feet) 559.00 560.00 561.00 561.17 Device #1 #2 Avail.Storage 4,537 cf Surf.Area (sq-ft) 5,227 5,227 5,227 5,227 Routing Primary Discarded Invert 559.22' 559.00' Storage Description Custom Stage Data (Prismatic) Listed below 11,343 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 5,227 5,227 889 Cum.Store (cubic-feet) 0 5,227 10,454 11,343 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=1.21 cfs @ 12.12 hrs HW=559.03' (Free Discharge) 2=Exfiltration (Exfiltration Controls 1.21 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=559.00' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 21P: Basin 3 Sharp-Crested Rectangular Weir Exfiltration

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 164 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 21P: Basin 3 Hydrograph 1.65 cfs Inflow Area=21,910 sf Peak Elev=559.09' Storage=183 cf 1.21 cfs Inflow Outflow Discarded Primary Flow (cfs) 1.21 cfs 1 0.00 cfs 0 0 5 10 15 20 25 30 35 40 45 Time (hours) 50 55 60 65 70 75 80 Pond 21P: Basin 3 Stage-Discharge Total Discarded Primary Elevation (feet) 561 560 Sharp-Crested Rectangular Weir Exfiltration 559 0 5 10 15 20 Discharge (cfs) 25 30

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 165 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 21P: Basin 3 Stage-Area-Storage 0 500 1,000 1,500 Surface/Horizontal/Wetted Area (sq-ft) 2,000 2,500 3,000 3,500 4,000 4,500 5,000 Elevation (feet) 561 560 Custom Stage Data 559 0 500 1,000 1,500 2,000 2,500 Storage (cubic-feet) 3,000 3,500 4,000 4,500 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 166 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 0.01 0.01 0.02 0.05 0.77 0.11 0.06 0.04 0.04 0.03 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 Storage (cubic-feet) 0 0 0 0 1 2 27 4 2 2 1 1 1 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) 559.00 559.00 559.00 559.00 559.00 559.00 559.01 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 559.00 Outflow (cfs) 0.00 0.00 0.01 0.01 0.02 0.05 0.73 0.11 0.06 0.04 0.04 0.03 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 Discarded (cfs) 0.00 0.00 0.01 0.01 0.02 0.05 0.73 0.11 0.06 0.04 0.04 0.03 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 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" 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 167

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 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 168

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 169 Summary for Pond 22P: Basin 4 Inflow Area = 49,050 sf, 84.66% Impervious, Inflow Depth = 4.61" for 10-Year event Inflow = 5.30 cfs @ 12.12 hrs, Volume= 18,836 cf Outflow = 1.23 cfs @ 12.40 hrs, Volume= 18,836 cf, Atten= 77%, Lag= 16.7 min Discarded = 1.13 cfs @ 11.80 hrs, Volume= 18,660 cf Primary = 0.10 cfs @ 12.40 hrs, Volume= 176 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= 572.69' @ 12.40 hrs Surf.Area= 12,197 sf Storage= 3,380 cf Plug-Flow detention time= 14.4 min calculated for 18,826 cf (100% of inflow) Center-of-Mass det. time= 14.4 min ( 770.6 - 756.3 ) 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 @ 11.80 hrs HW=572.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 1.13 cfs) Primary OutFlow Max=0.10 cfs @ 12.40 hrs HW=572.69' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.10 cfs @ 1.49 fps) Pond 22P: Basin 4 Sharp-Crested Rectangular Weir Orifice Exfiltration

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Printed 10/25/2024 Page 170 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 22P: Basin 4 Hydrograph 5.30 cfs Inflow Area=49,050 sf Peak Elev=572.69' Storage=3,380 cf 5 Inflow Outflow Discarded Primary Flow (cfs) 4 3 1.23 cfs 2 1.13 cfs 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 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