complete drainage report rev 9

POA-1 NOAA 24-hr D 100-Year Rainfall=8.66" 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 109 Summary for Subcatchment 27S: Basin 5 - Perv Runoff = 0.57 cfs @ 12.10 hrs, Volume= Routed to Pond 18P : Basin 5 1,582 cf, Depth= 5.52" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 3,440 3,440 CN 74 Description >75% Grass cover, Good, HSG C 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 40 0.0200 1.19 Sheet Flow, Sheet Flow (A-B) Smooth surfaces n= 0.011 P2= 3.47" 1.2 182 2.50 Direct Entry, Pipe Flow (B-C) 1.8 222 Total Sheet Flow (A-B) Subcatchment 27S: Basin 5 - Perv Pipe Flow (B-C) Subcatchment 27S: Basin 5 - Perv Hydrograph Runoff 0.6 0.57 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=3,440 sf Runoff Volume=1,582 cf Runoff Depth=5.52" Flow Length=222' Slope=0.0200 '/' Tc=1.8 min CN=74 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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 2024-05-12 HydroCad - Proposed POA 1B-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 Hydrograph for Subcatchment 27S: Basin 5 - Perv Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.10 0.00 2.00 0.21 0.00 3.00 0.33 0.00 4.00 0.45 0.00 5.00 0.59 0.00 6.00 0.74 0.00 7.00 0.91 0.01 8.00 1.12 0.05 9.00 1.37 0.11 10.00 1.72 0.23 11.00 2.25 0.47 12.00 4.15 1.71 13.00 6.41 3.53 14.00 6.94 3.99 15.00 7.29 4.29 16.00 7.54 4.51 17.00 7.75 4.70 18.00 7.92 4.85 19.00 8.07 4.99 20.00 8.21 5.11 21.00 8.33 5.23 22.00 8.45 5.33 23.00 8.56 5.43 24.00 8.66 5.52 25.00 8.66 5.52 26.00 8.66 5.52 27.00 8.66 5.52 28.00 8.66 5.52 29.00 8.66 5.52 30.00 8.66 5.52 31.00 8.66 5.52 32.00 8.66 5.52 33.00 8.66 5.52 34.00 8.66 5.52 35.00 8.66 5.52 36.00 8.66 5.52 37.00 8.66 5.52 38.00 8.66 5.52 39.00 8.66 5.52 40.00 8.66 5.52 41.00 8.66 5.52 42.00 8.66 5.52 43.00 8.66 5.52 44.00 8.66 5.52 45.00 8.66 5.52 46.00 8.66 5.52 47.00 8.66 5.52 48.00 8.66 5.52 49.00 8.66 5.52 50.00 8.66 5.52 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.03 0.32 0.06 0.03 0.02 0.02 0.01 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 0.00 0.00 0.00 0.00 0.00 0.00 Time Precip. Excess (hours) (inches) (inches) 51.00 8.66 5.52 52.00 8.66 5.52 53.00 8.66 5.52 54.00 8.66 5.52 55.00 8.66 5.52 56.00 8.66 5.52 57.00 8.66 5.52 58.00 8.66 5.52 59.00 8.66 5.52 60.00 8.66 5.52 61.00 8.66 5.52 62.00 8.66 5.52 63.00 8.66 5.52 64.00 8.66 5.52 65.00 8.66 5.52 66.00 8.66 5.52 67.00 8.66 5.52 68.00 8.66 5.52 69.00 8.66 5.52 70.00 8.66 5.52 71.00 8.66 5.52 72.00 8.66 5.52 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 110

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 111 Summary for Subcatchment 28S: undetained impervious Runoff = 0.06 cfs @ 12.09 hrs, Volume= Routed to Link 25L : POA 1 210 cf, Depth= 8.42" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) 300 300 * CN 98 Description non pavement impervious 100.00% Impervious Area Subcatchment 28S: undetained impervious Hydrograph 0.07 Runoff 0.065 0.06 cfs NOAA 24-hr D 100-Year Rainfall=8.66" Runoff Area=300 sf Runoff Volume=210 cf Runoff Depth=8.42" Tc=0.0 min CN=98 0.06 0.055 0.05 Flow (cfs) 0.045 0.04 0.035 0.03 0.025 0.02 0.015 0.01 0.005 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 2024-05-12 HydroCad - Proposed POA 1B-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 Hydrograph for Subcatchment 28S: undetained impervious Time Precip. Excess (hours) (inches) (inches) 0.00 0.00 0.00 1.00 0.10 0.01 2.00 0.21 0.08 3.00 0.33 0.17 4.00 0.45 0.28 5.00 0.59 0.40 6.00 0.74 0.54 7.00 0.91 0.71 8.00 1.12 0.91 9.00 1.37 1.16 10.00 1.72 1.49 11.00 2.25 2.02 12.00 4.15 3.91 13.00 6.41 6.17 14.00 6.94 6.70 15.00 7.29 7.05 16.00 7.54 7.30 17.00 7.75 7.51 18.00 7.92 7.68 19.00 8.07 7.83 20.00 8.21 7.97 21.00 8.33 8.09 22.00 8.45 8.21 23.00 8.56 8.32 24.00 8.66 8.42 25.00 8.66 8.42 26.00 8.66 8.42 27.00 8.66 8.42 28.00 8.66 8.42 29.00 8.66 8.42 30.00 8.66 8.42 31.00 8.66 8.42 32.00 8.66 8.42 33.00 8.66 8.42 34.00 8.66 8.42 35.00 8.66 8.42 36.00 8.66 8.42 37.00 8.66 8.42 38.00 8.66 8.42 39.00 8.66 8.42 40.00 8.66 8.42 41.00 8.66 8.42 42.00 8.66 8.42 43.00 8.66 8.42 44.00 8.66 8.42 45.00 8.66 8.42 46.00 8.66 8.42 47.00 8.66 8.42 48.00 8.66 8.42 49.00 8.66 8.42 50.00 8.66 8.42 Runoff (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.05 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 0.00 0.00 0.00 0.00 0.00 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 8.66 8.42 52.00 8.66 8.42 53.00 8.66 8.42 54.00 8.66 8.42 55.00 8.66 8.42 56.00 8.66 8.42 57.00 8.66 8.42 58.00 8.66 8.42 59.00 8.66 8.42 60.00 8.66 8.42 61.00 8.66 8.42 62.00 8.66 8.42 63.00 8.66 8.42 64.00 8.66 8.42 65.00 8.66 8.42 66.00 8.66 8.42 67.00 8.66 8.42 68.00 8.66 8.42 69.00 8.66 8.42 70.00 8.66 8.42 71.00 8.66 8.42 72.00 8.66 8.42 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 112

POA-1 2024-05-12 HydroCad - Proposed POA 1B-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 113 Summary for Pond 16P: Basin 1 Inflow Area = 416,846 sf, 59.40% Impervious, Inflow Depth = 4.82" for 100-Year event Inflow = 41.28 cfs @ 12.20 hrs, Volume= 167,378 cf Outflow = 12.27 cfs @ 12.56 hrs, Volume= 150,907 cf, Atten= 70%, Lag= 21.2 min Primary = 12.27 cfs @ 12.56 hrs, Volume= 150,907 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= 545.30' @ 12.56 hrs Surf.Area= 48,362 sf Storage= 83,095 cf Plug-Flow detention time= 335.1 min calculated for 150,886 cf (90% of inflow) Center-of-Mass det. time= 283.4 min ( 1,055.8 - 772.4 ) 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=12.27 cfs @ 12.56 hrs HW=545.30' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 2.71 cfs @ 4.98 fps) 3=Orifice/Grate (Orifice Controls 9.56 cfs @ 3.58 fps) Pond 16P: Basin 1 Grate Orifice/Grate Orifice

POA-1 NOAA 24-hr D 100-Year Rainfall=8.66" 2024-05-12 HydroCad - Proposed POA 1B-1 Printed 10/25/2024 Page 114 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Pond 16P: Basin 1 Flow (cfs) Hydrograph 46 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Primary 41.28 cfs Inflow Area=416,846 sf Peak Elev=545.30' Storage=83,095 cf 12.27 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 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 115 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 100-Year Rainfall=8.66" 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 0.25 0.39 0.51 0.89 1.74 15.86 2.56 1.39 0.95 0.79 0.68 0.57 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 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) 0 723 3,093 6,302 11,247 19,779 46,635 60,873 48,007 43,359 40,687 38,744 36,846 32,275 28,877 26,465 24,682 23,316 22,243 21,380 20,666 20,071 19,571 19,138 18,763 18,438 18,154 17,900 17,670 17,463 17,276 17,108 16,956 16,820 16,696 16,580 16,471 Elevation (feet) 543.50 543.52 543.57 543.65 543.76 543.95 544.53 544.84 544.56 544.46 544.40 544.36 544.32 544.22 544.15 544.10 544.06 544.03 544.01 543.99 543.97 543.96 543.95 543.94 543.93 543.92 543.92 543.91 543.91 543.90 543.90 543.89 543.89 543.89 543.88 543.88 543.88 Primary (cfs) 0.00 0.00 0.00 0.00 0.00 0.07 2.05 5.75 2.34 1.44 1.07 0.94 0.83 0.57 0.39 0.28 0.21 0.17 0.13 0.11 0.09 0.08 0.06 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 Printed 10/25/2024 Page 116

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Printed 10/25/2024 Page 117 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 54

1 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