Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 33 Hydrograph for Subcatchment 38S: Basin 2-4 Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.27 0.00 0.12 0.05 5.00 0.59 0.00 0.40 0.08 7.50 1.01 0.06 0.80 0.20 10.00 1.72 0.33 1.49 0.53 12.50 5.91 3.49 5.68 3.76 15.00 7.29 4.72 7.05 0.61 17.50 7.84 5.22 7.60 0.37 20.00 8.21 5.56 7.97 0.28 22.50 8.51 5.84 8.27 0.23 25.00 8.66 5.98 8.42 0.00 27.50 8.66 5.98 8.42 0.00 30.00 8.66 5.98 8.42 0.00 32.50 8.66 5.98 8.42 0.00 35.00 8.66 5.98 8.42 0.00 37.50 8.66 5.98 8.42 0.00 40.00 8.66 5.98 8.42 0.00 42.50 8.66 5.98 8.42 0.00 45.00 8.66 5.98 8.42 0.00 47.50 8.66 5.98 8.42 0.00 50.00 8.66 5.98 8.42 0.00 52.50 8.66 5.98 8.42 0.00 55.00 8.66 5.98 8.42 0.00 57.50 8.66 5.98 8.42 0.00 60.00 8.66 5.98 8.42 0.00 62.50 8.66 5.98 8.42 0.00 65.00 8.66 5.98 8.42 0.00 67.50 8.66 5.98 8.42 0.00 70.00 8.66 5.98 8.42 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 45S: Basin 2-4 pe-development Runoff = 8.80 cfs @ 12.27 hrs, Volume= 0.925 af, Depth= 5.04" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.05 hrs NOAA 24-hr D 100-Year Rainfall=8.66" Area (sf) CN Description 96,036 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.4 100 0.0500 0.12 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 3.6 290 0.0720 1.34 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 18.0 390 Total Subcatchment 45S: Basin 2-4 pe-development Hydrograph Runoff 8.80 cfs 9 NOAA 24-hr D 8 100-Year Rainfall=8.66" 7 Runoff Area=96,036 sf 6 Runoff Volume=0.925 af Flow (cfs) 5 Runoff Depth=5.04"

Runoff Volume=0.925 af Flow (cfs) 5 Runoff Depth=5.04" Flow Length=390' 4 Tc=18.0 min 3 CN=70/0 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)

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 35 Hydrograph for Subcatchment 45S: Basin 2-4 pe-development Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.27 0.00 0.00 0.00 5.00 0.59 0.00 0.00 0.00 7.50 1.01 0.01 0.00 0.02 10.00 1.72 0.14 0.00 0.23 12.50 5.91 2.74 0.00 4.89 15.00 7.29 3.86 0.00 0.58 17.50 7.84 4.33 0.00 0.35 20.00 8.21 4.64 0.00 0.26 22.50 8.51 4.90 0.00 0.22 25.00 8.66 5.04 0.00 0.00 27.50 8.66 5.04 0.00 0.00 30.00 8.66 5.04 0.00 0.00 32.50 8.66 5.04 0.00 0.00 35.00 8.66 5.04 0.00 0.00 37.50 8.66 5.04 0.00 0.00 40.00 8.66 5.04 0.00 0.00 42.50 8.66 5.04 0.00 0.00 45.00 8.66 5.04 0.00 0.00 47.50 8.66 5.04 0.00 0.00 50.00 8.66 5.04 0.00 0.00 52.50 8.66 5.04 0.00 0.00 55.00 8.66 5.04 0.00 0.00 57.50 8.66 5.04 0.00 0.00 60.00 8.66 5.04 0.00 0.00 62.50 8.66 5.04 0.00 0.00 65.00 8.66 5.04 0.00 0.00 67.50 8.66 5.04 0.00 0.00 70.00 8.66 5.04 0.00 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 36 Summary for Pond 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 6.65" for 100-Year event Inflow = 13.54 cfs @ 12.17 hrs, Volume= 1.223 af Outflow = 2.06 cfs @ 12.88 hrs, Volume= 0.989 af, Atten= 85%, Lag= 42.7 min Primary = 2.06 cfs @ 12.88 hrs, Volume= 0.989 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 544.61' @ 12.88 hrs Surf.Area= 11,090 sf Storage= 28,898 cf Plug-Flow detention time= 315.5 min calculated for 0.989 af (81% of inflow) Center-of-Mass det. time= 233.6 min ( 1,024.6 - 791.0 ) Volume Invert Avail.Storage Storage Description #1 542.00' 44,360 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 11,090 0 0 546.00 11,090 44,360 44,360 Device Routing Invert Outlet Devices #1 Primary 542.90' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.40' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.06 cfs @ 12.88 hrs HW=544.61' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.14 cfs @ 5.81 fps) 2=Orifice/Grate (Orifice Controls 0.92 cfs @ 4.71 fps)

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 37 Pond 43P: pond 2-4 Hydrograph Inflow 15 13.54 cfs Primary 14 Inflow Area=2.205 ac 13 12 Peak Elev=544.61' 11 10 Storage=28,898 cf 9 Flow (cfs) 8 7 6 5 4 3 2.06 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)

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 38 Hydrograph for Pond 43P: pond 2-4 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 542.00 0.00 2.50 0.05 230 542.02 0.00 5.00 0.08 842 542.08 0.00 7.50 0.20 2,004 542.18 0.00 10.00 0.53 4,895 542.44 0.00 12.50 3.76 27,974 544.52 1.99 15.00 0.61 22,882 544.06 1.51 17.50 0.37 17,535 543.58 0.71 20.00 0.28 15,336 543.38 0.46 22.50 0.23 14,139 543.27 0.33 25.00 0.00 12,960 543.17 0.19 27.50 0.00 11,837 543.07 0.08 30.00 0.00 11,305 543.02 0.04 32.50 0.00 11,003 542.99 0.03 35.00 0.00 10,806 542.97 0.02 37.50 0.00 10,672 542.96 0.01 40.00 0.00 10,576 542.95 0.01 42.50 0.00 10,498 542.95 0.01 45.00 0.00 10,434 542.94 0.01 47.50 0.00 10,382 542.94 0.01 50.00 0.00 10,339 542.93 0.00 52.50 0.00 10,304 542.93 0.00 55.00 0.00 10,275 542.93 0.00 57.50 0.00 10,252 542.92 0.00 60.00 0.00 10,233 542.92 0.00 62.50 0.00 10,217 542.92 0.00 65.00 0.00 10,204 542.92 0.00 67.50 0.00 10,193 542.92 0.00 70.00 0.00 10,182 542.92 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 39 Stage-Discharge for Pond 43P: pond 2-4 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 542.00 0.00 543.02 0.04 544.04 1.48 545.06 2.43 542.02 0.00 543.04 0.06 544.06 1.51 545.08 2.44 542.04 0.00 543.06 0.07 544.08 1.53 545.10 2.46 542.06 0.00 543.08 0.09 544.10 1.56 545.12 2.47 542.08 0.00 543.10 0.11 544.12 1.58 545.14 2.49 542.10 0.00 543.12 0.13 544.14 1.60 545.16 2.50 542.12 0.00 543.14 0.16 544.16 1.63 545.18 2.52 542.14 0.00 543.16 0.18 544.18 1.65 545.20 2.53 542.16 0.00 543.18 0.20 544.20 1.67 545.22 2.54 542.18 0.00 543.20 0.23 544.22 1.69 545.24 2.56 542.20 0.00 543.22 0.26 544.24 1.71 545.26 2.57 542.22 0.00 543.24 0.28 544.26 1.73 545.28 2.59 542.24 0.00 543.26 0.31 544.28 1.76 545.30 2.60 542.26 0.00 543.28 0.34 544.30 1.78 545.32 2.61 542.28 0.00 543.30 0.36 544.32 1.80 545.34 2.63 542.30 0.00 543.32 0.39 544.34 1.82 545.36 2.64 542.32 0.00 543.34 0.41 544.36 1.84 545.38 2.66 542.34 0.00 543.36 0.44 544.38 1.86 545.40 2.67 542.36 0.00 543.38 0.46 544.40 1.88

1.84 545.38 2.66 542.34 0.00 543.36 0.44 544.38 1.86 545.40 2.67 542.36 0.00 543.38 0.46 544.40 1.88 545.42 2.68 542.38 0.00 543.40 0.47 544.42 1.90 545.44 2.70 542.40 0.00 543.42 0.49 544.44 1.91 545.46 2.71 542.42 0.00 543.44 0.51 544.46 1.93 545.48 2.72 542.44 0.00 543.46 0.54 544.48 1.95 545.50 2.74 542.46 0.00 543.48 0.56 544.50 1.97 545.52 2.75 542.48 0.00 543.50 0.59 544.52 1.99 545.54 2.76 542.50 0.00 543.52 0.62 544.54 2.01 545.56 2.77 542.52 0.00 543.54 0.65 544.56 2.02 545.58 2.79 542.54 0.00 543.56 0.68 544.58 2.04 545.60 2.80 542.56 0.00 543.58 0.71 544.60 2.06 545.62 2.81 542.58 0.00 543.60 0.75 544.62 2.08 545.64 2.83 542.60 0.00 543.62 0.78 544.64 2.09 545.66 2.84 542.62 0.00 543.64 0.82 544.66 2.11 545.68 2.85 542.64 0.00 543.66 0.85 544.68 2.13 545.70 2.86 542.66 0.00 543.68 0.89 544.70 2.15 545.72 2.88 542.68 0.00 543.70 0.93 544.72 2.16 545.74 2.89 542.70 0.00 543.72 0.97 544.74 2.18 545.76 2.90 542.72 0.00 543.74 1.01 544.76 2.20 545.78 2.91 542.74 0.00 543.76 1.05 544.78 2.21 545.80 2.93 542.76 0.00 543.78 1.09 544.80 2.23 545.82 2.94 542.78 0.00 543.80 1.12 544.82 2.24 545.84 2.95 542.80 0.00 543.82 1.16 544.84 2.26 545.86 2.96 542.82 0.00 543.84 1.20 544.86

2 2.24 545.84 2.95 542.80 0.00 543.82 1.16 544.84 2.26 545.86 2.96 542.82 0.00 543.84 1.20 544.86 2.28 545.88 2.97 542.84 0.00 543.86 1.23 544.88 2.29 545.90 2.99 542.86 0.00 543.88 1.26 544.90 2.31 545.92 3.00 542.88 0.00 543.90 1.29 544.92 2.32 545.94 3.01 542.90 0.00 543.92 1.32 544.94 2.34 545.96 3.02 542.92 0.00 543.94 1.35 544.96 2.35 545.98 3.03 542.94 0.01 543.96 1.38 544.98 2.37 546.00 3.05 542.96 0.01 543.98 1.40 545.00 2.38 542.98 0.02 544.00 1.43 545.02 2.40 543.00 0.03 544.02 1.46 545.04 2.41