Drainage Report

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 12 Summary for Subcatchment 32S: Basin 1 Undetained Runoff = 1.36 cfs @ 12.18 hrs, Volume= 0.118 af, Depth= 1.20" 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 2-Year Rainfall=3.44" Area (sf) CN Description 51,560 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 70 0.0800 0.20 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 5.9 70 Total, Increased to minimum Tc = 10.0 min Subcatchment 32S: Basin 1 Undetained Hydrograph Runoff 1.36 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=51,560 sf 1 Runoff Volume=0.118 af Flow (cfs) Runoff Depth=1.20" Flow Length=70'

Runoff Depth=1.20" Flow Length=70' Slope=0.0800 '/' Tc=10.0 min CN=74/0 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 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 32S: Basin 1 Undetained Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.11 0.00 0.00 0.00 5.00 0.24 0.00 0.00 0.00 7.50 0.40 0.00 0.00 0.00 10.00 0.68 0.00 0.00 0.00 12.50 2.35 0.53 0.00 0.45 15.00 2.89 0.84 0.00 0.09 17.50 3.11 0.98 0.00 0.05 20.00 3.26 1.08 0.00 0.04 22.50 3.38 1.16 0.00 0.04 25.00 3.44 1.20 0.00 0.00 27.50 3.44 1.20 0.00 0.00 30.00 3.44 1.20 0.00 0.00 32.50 3.44 1.20 0.00 0.00 35.00 3.44 1.20 0.00 0.00 37.50 3.44 1.20 0.00 0.00 40.00 3.44 1.20 0.00 0.00 42.50 3.44 1.20 0.00 0.00 45.00 3.44 1.20 0.00 0.00 47.50 3.44 1.20 0.00 0.00 50.00 3.44 1.20 0.00 0.00 52.50 3.44 1.20 0.00 0.00 55.00 3.44 1.20 0.00 0.00 57.50 3.44 1.20 0.00 0.00 60.00 3.44 1.20 0.00 0.00 62.50 3.44 1.20 0.00 0.00 65.00 3.44 1.20 0.00 0.00 67.50 3.44 1.20 0.00 0.00 70.00 3.44 1.20 0.00 0.00

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 36S: Basin 1 Predevelopment Runoff = 4.51 cfs @ 12.49 hrs, Volume= 0.685 af, Depth= 0.97" 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 2-Year Rainfall=3.44" Area (sf) CN Description 368,926 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" 17.6 1,260 0.0570 1.19 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 31.9 1,360 Total Subcatchment 36S: Basin 1 Predevelopment Hydrograph 5 Runoff 4.51 cfs NOAA 24-hr D 4 2-Year Rainfall=3.44" Runoff Area=368,926 sf 3 Runoff Volume=0.685 af Flow (cfs) Runoff Depth=0.97" Flow Length=1,360' 2

Runoff Depth=0.97" Flow Length=1,360' 2 Tc=31.9 min CN=70/0 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 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 15 Hydrograph for Subcatchment 36S: Basin 1 Predevelopment Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.11 0.00 0.00 0.00 5.00 0.24 0.00 0.00 0.00 7.50 0.40 0.00 0.00 0.00 10.00 0.68 0.00 0.00 0.00 12.50 2.35 0.39 0.00 4.50 15.00 2.89 0.66 0.00 0.62 17.50 3.11 0.78 0.00 0.37 20.00 3.26 0.86 0.00 0.27 22.50 3.38 0.93 0.00 0.23 25.00 3.44 0.97 0.00 0.01 27.50 3.44 0.97 0.00 0.00 30.00 3.44 0.97 0.00 0.00 32.50 3.44 0.97 0.00 0.00 35.00 3.44 0.97 0.00 0.00 37.50 3.44 0.97 0.00 0.00 40.00 3.44 0.97 0.00 0.00 42.50 3.44 0.97 0.00 0.00 45.00 3.44 0.97 0.00 0.00 47.50 3.44 0.97 0.00 0.00 50.00 3.44 0.97 0.00 0.00 52.50 3.44 0.97 0.00 0.00 55.00 3.44 0.97 0.00 0.00 57.50 3.44 0.97 0.00 0.00 60.00 3.44 0.97 0.00 0.00 62.50 3.44 0.97 0.00 0.00 65.00 3.44 0.97 0.00 0.00 67.50 3.44 0.97 0.00 0.00 70.00 3.44 0.97 0.00 0.00

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 16 Summary for Pond 29P: Basin 1 Inflow Area = 7.230 ac, Inflow Depth = 2.43" for 2-Year event Inflow = 9.88 cfs @ 12.42 hrs, Volume= 1.466 af Outflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af, Atten= 100%, Lag= 0.0 min Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.84' @ 25.80 hrs Surf.Area= 32,964 sf Storage= 63,856 cf Plug-Flow detention time= (not calculated: initial storage exceeds outflow) Center-of-Mass det. time= (not calculated: no outflow) Volume Invert Avail.Storage Storage Description #1 540.50' 191,393 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 21,047 0 0 542.00 29,152 37,649 37,649 544.00 38,188 67,340 104,989 546.00 48,216 86,404 191,393 Device Routing Invert Outlet Devices #1 Primary 542.90' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=540.50' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs)

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 17 Pond 29P: Basin 1 Hydrograph Inflow 11 9.88 cfs Primary 10 Inflow Area=7.230 ac 9 Peak Elev=542.84' 8 Storage=63,856 cf 7 Flow (cfs) 6 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)

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 18 Hydrograph for Pond 29P: Basin 1 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 540.50 0.00 2.50 0.06 127 540.51 0.00 5.00 0.17 1,231 540.56 0.00 7.50 0.29 3,216 540.65 0.00 10.00 0.58 6,808 540.81 0.00 12.50 9.36 28,252 541.67 0.00 15.00 0.83 50,183 542.42 0.00 17.50 0.48 55,647 542.59 0.00 20.00 0.35 59,153 542.70 0.00 22.50 0.29 61,995 542.79 0.00 25.00 0.01 63,853 542.84 0.00 27.50 0.00 63,858 542.84 0.00 30.00 0.00 63,858 542.84 0.00 32.50 0.00 63,858 542.84 0.00 35.00 0.00 63,858 542.84 0.00 37.50 0.00 63,858 542.84 0.00 40.00 0.00 63,858 542.84 0.00 42.50 0.00 63,858 542.84 0.00 45.00 0.00 63,858 542.84 0.00 47.50 0.00 63,858 542.84 0.00 50.00 0.00 63,858 542.84 0.00 52.50 0.00 63,858 542.84 0.00 55.00 0.00 63,858 542.84 0.00 57.50 0.00 63,858 542.84 0.00 60.00 0.00 63,858 542.84 0.00 62.50 0.00 63,858 542.84 0.00 65.00 0.00 63,858 542.84 0.00 67.50 0.00 63,858 542.84 0.00 70.00 0.00 63,858 542.84 0.00

Basin 1 without exfiltration Proposed basin 1 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 19 Stage-Discharge for Pond 29P: Basin 1 Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 540.50 0.00 543.05 0.08 545.60 2.59 540.55 0.00 543.10 0.13 545.65 2.61 540.60 0.00 543.15 0.20 545.70 2.64 540.65 0.00 543.20 0.28 545.75 2.67 540.70 0.00 543.25 0.37 545.80 2.69 540.75 0.00 543.30 0.47 545.85 2.72 540.80 0.00 543.35 0.57 545.90 2.74 540.85 0.00 543.40 0.68 545.95 2.77 540.90 0.00 543.45 0.78 546.00 2.80 540.95 0.00 543.50 0.87 541.00 0.00 543.55 0.95 541.05 0.00 543.60 1.02 541.10 0.00 543.65 1.08 541.15 0.00 543.70 1.15 541.20 0.00 543.75 1.21 541.25 0.00 543.80 1.27 541.30 0.00 543.85 1.32 541.35 0.00 543.90 1.37 541.40 0.00 543.95 1.42 541.45 0.00 544.00 1.47 541.50 0.00 544.05 1.52 541.55 0.00 544.10 1.56 541.60 0.00 544.15 1.61 541.65 0.00 544.20 1.65 541.70 0.00 544.25 1.69 541.75 0.00 544.30 1.74 541.80 0.00 544.35 1.78 541.85 0.00 544.40 1.82 541.90 0.00 544.45 1.85 541.95 0.00 544.50 1.89 542.00 0.00 544.55 1.93 542.05 0.00 544.60 1.96 542.10 0.00 544.65 2.00 542.15 0.00 544.70 2.04 542.20 0.00 544.75 2.07 542.25 0.00 544.80 2.10 542.30 0.00 544.85