Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 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 11 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 0.11 0.00 0.02 0.01 5.00 0.24 0.00 0.09 0.02 7.50 0.40 0.00 0.23 0.04 10.00 0.68 0.00 0.49 0.10 12.50 2.35 0.68 2.12 1.17 15.00 2.89 1.04 2.66 0.20 17.50 3.11 1.20 2.88 0.13 20.00 3.26 1.31 3.03 0.10 22.50 3.38 1.39 3.15 0.08 25.00 3.44 1.44 3.21 0.00 27.50 3.44 1.44 3.21 0.00 30.00 3.44 1.44 3.21 0.00 32.50 3.44 1.44 3.21 0.00 35.00 3.44 1.44 3.21 0.00 37.50 3.44 1.44 3.21 0.00 40.00 3.44 1.44 3.21 0.00 42.50 3.44 1.44 3.21 0.00 45.00 3.44 1.44 3.21 0.00 47.50 3.44 1.44 3.21 0.00 50.00 3.44 1.44 3.21 0.00 52.50 3.44 1.44 3.21 0.00 55.00 3.44 1.44 3.21 0.00 57.50 3.44 1.44 3.21 0.00 60.00 3.44 1.44 3.21 0.00 62.50 3.44 1.44 3.21 0.00 65.00 3.44 1.44 3.21 0.00 67.50 3.44 1.44 3.21 0.00 70.00 3.44 1.44 3.21 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 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 45S: Basin 2-4 pe-development Runoff = 1.56 cfs @ 12.29 hrs, Volume= 0.178 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 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 1.56 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=96,036 sf Runoff Volume=0.178 af 1 Flow (cfs) Runoff Depth=0.97"

1 Flow (cfs) Runoff Depth=0.97" Flow Length=390' Tc=18.0 min CN=70/0 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 2-4 without exfiltration Proposed Basin 2-4 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 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 0.11 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 0.99 15.00 2.89 0.66 0.00 0.15 17.50 3.11 0.78 0.00 0.09 20.00 3.26 0.86 0.00 0.07 22.50 3.38 0.93 0.00 0.06 25.00 3.44 0.97 0.00 0.00 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 2-4 without exfiltration Proposed Basin 2-4 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 Pond 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 1.93" for 2-Year event Inflow = 3.93 cfs @ 12.18 hrs, Volume= 0.354 af Outflow = 0.11 cfs @ 17.96 hrs, Volume= 0.121 af, Atten= 97%, Lag= 347.0 min Primary = 0.11 cfs @ 17.96 hrs, Volume= 0.121 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.10' @ 17.96 hrs Surf.Area= 11,090 sf Storage= 12,214 cf Plug-Flow detention time= 777.8 min calculated for 0.121 af (34% of inflow) Center-of-Mass det. time= 613.5 min ( 1,428.5 - 815.0 ) 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=0.11 cfs @ 17.96 hrs HW=543.10' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.11 cfs @ 1.53 fps) 2=Orifice/Grate ( Controls 0.00 cfs)

Basin 2-4 without exfiltration Proposed Basin 2-4 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 Pond 43P: pond 2-4 Hydrograph Inflow 3.93 cfs Primary 4 Inflow Area=2.205 ac Peak Elev=543.10' 3 Storage=12,214 cf Flow (cfs) 2 1 0.11 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 2-4 without exfiltration Proposed Basin 2-4 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 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 0.01 28 542.00 0.00 5.00 0.02 195 542.02 0.00 7.50 0.04 485 542.04 0.00 10.00 0.10 1,037 542.09 0.00 12.50 1.17 8,043 542.73 0.00 15.00 0.20 11,634 543.05 0.07 17.50 0.13 12,203 543.10 0.11 20.00 0.10 12,149 543.10 0.11 22.50 0.08 12,019 543.08 0.10 25.00 0.00 11,679 543.05 0.07 27.50 0.00 11,219 543.01 0.04 30.00 0.00 10,950 542.99 0.02 32.50 0.00 10,770 542.97 0.02 35.00 0.00 10,647 542.96 0.01 37.50 0.00 10,556 542.95 0.01 40.00 0.00 10,482 542.95 0.01 42.50 0.00 10,421 542.94 0.01 45.00 0.00 10,371 542.94 0.01 47.50 0.00 10,330 542.93 0.00 50.00 0.00 10,297 542.93 0.00 52.50 0.00 10,269 542.93 0.00 55.00 0.00 10,247 542.92 0.00 57.50 0.00 10,229 542.92 0.00 60.00 0.00 10,214 542.92 0.00 62.50 0.00 10,201 542.92 0.00 65.00 0.00 10,190 542.92 0.00 67.50 0.00 10,180 542.92 0.00 70.00 0.00 10,170 542.92 0.00

Basin 2-4 without exfiltration Proposed Basin 2-4 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 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

.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