Drainage Report

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 42S: basin 2-6 pre-development Runoff = 3.23 cfs @ 12.27 hrs, Volume= 0.338 af, Depth= 2.20" 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 10-Year Rainfall=5.22" Area (sf) CN Description 80,223 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 100 0.0400 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 1.6 130 0.0700 1.32 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 17.3 230 Total Subcatchment 42S: basin 2-6 pre-development Hydrograph Runoff 3.23 cfs NOAA 24-hr D 3 10-Year Rainfall=5.22" Runoff Area=80,223 sf Runoff Volume=0.338 af Flow (cfs) 2 Runoff Depth=2.20"

e=0.338 af Flow (cfs) 2 Runoff Depth=2.20" Flow Length=230' Tc=17.3 min 1 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 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 22 Hydrograph for Subcatchment 42S: basin 2-6 pre-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 0.16 0.00 0.00 0.00 5.00 0.36 0.00 0.00 0.00 7.50 0.61 0.00 0.00 0.00 10.00 1.03 0.01 0.00 0.02 12.50 3.57 1.05 0.00 1.81 15.00 4.39 1.60 0.00 0.24 17.50 4.73 1.83 0.00 0.15 20.00 4.95 2.00 0.00 0.11 22.50 5.13 2.13 0.00 0.09 25.00 5.22 2.20 0.00 0.00 27.50 5.22 2.20 0.00 0.00 30.00 5.22 2.20 0.00 0.00 32.50 5.22 2.20 0.00 0.00 35.00 5.22 2.20 0.00 0.00 37.50 5.22 2.20 0.00 0.00 40.00 5.22 2.20 0.00 0.00 42.50 5.22 2.20 0.00 0.00 45.00 5.22 2.20 0.00 0.00 47.50 5.22 2.20 0.00 0.00 50.00 5.22 2.20 0.00 0.00 52.50 5.22 2.20 0.00 0.00 55.00 5.22 2.20 0.00 0.00 57.50 5.22 2.20 0.00 0.00 60.00 5.22 2.20 0.00 0.00 62.50 5.22 2.20 0.00 0.00 65.00 5.22 2.20 0.00 0.00 67.50 5.22 2.20 0.00 0.00 70.00 5.22 2.20 0.00 0.00

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 23 Summary for Pond 37P: Pond 2-6 Inflow Area = 1.842 ac, Inflow Depth = 4.98" for 10-Year event Inflow = 7.83 cfs @ 12.17 hrs, Volume= 0.765 af Outflow = 0.68 cfs @ 13.43 hrs, Volume= 0.439 af, Atten= 91%, Lag= 75.9 min Primary = 0.68 cfs @ 13.43 hrs, Volume= 0.439 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.57' @ 13.43 hrs Surf.Area= 10,782 sf Storage= 22,303 cf Plug-Flow detention time= 483.2 min calculated for 0.439 af (57% of inflow) Center-of-Mass det. time= 355.7 min ( 1,108.0 - 752.2 ) Volume Invert Avail.Storage Storage Description #1 540.50' 37,737 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 10,782 0 0 544.00 10,782 37,737 37,737 Device Routing Invert Outlet Devices #1 Primary 541.80' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.68 cfs @ 13.43 hrs HW=542.57' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.68 cfs @ 3.47 fps)

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 24 Pond 37P: Pond 2-6 Hydrograph Inflow 7.83 cfs Primary 8 Inflow Area=1.842 ac 7 Peak Elev=542.57' 6 Storage=22,303 cf 5 Flow (cfs) 4 3 2 1 0.68 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 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 25 Hydrograph for Pond 37P: Pond 2-6 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 540.50 0.00 2.50 0.08 252 540.52 0.00 5.00 0.13 1,210 540.61 0.00 7.50 0.21 2,685 540.75 0.00 10.00 0.42 5,273 540.99 0.00 12.50 2.08 20,704 542.42 0.58 15.00 0.33 21,215 542.47 0.61 17.50 0.20 18,847 542.25 0.42 20.00 0.15 17,419 542.12 0.25 22.50 0.12 16,780 542.06 0.18 25.00 0.00 16,129 542.00 0.11 27.50 0.00 15,450 541.93 0.05 30.00 0.00 15,090 541.90 0.03 32.50 0.00 14,869 541.88 0.02 35.00 0.00 14,722 541.87 0.01 37.50 0.00 14,617 541.86 0.01 40.00 0.00 14,535 541.85 0.01 42.50 0.00 14,470 541.84 0.01 45.00 0.00 14,419 541.84 0.00 47.50 0.00 14,380 541.83 0.00 50.00 0.00 14,348 541.83 0.00 52.50 0.00 14,323 541.83 0.00 55.00 0.00 14,300 541.83 0.00 57.50 0.00 14,278 541.82 0.00 60.00 0.00 14,258 541.82 0.00 62.50 0.00 14,240 541.82 0.00 65.00 0.00 14,223 541.82 0.00 67.50 0.00 14,207 541.82 0.00 70.00 0.00 14,193 541.82 0.00

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 26 Stage-Discharge for Pond 37P: Pond 2-6 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 540.50 0.00 541.52 0.00 542.54 0.66 543.56 1.16 540.52 0.00 541.54 0.00 542.56 0.68 543.58 1.17 540.54 0.00 541.56 0.00 542.58 0.69 543.60 1.18 540.56 0.00 541.58 0.00 542.60 0.70 543.62 1.18 540.58 0.00 541.60 0.00 542.62 0.71 543.64 1.19 540.60 0.00 541.62 0.00 542.64 0.73 543.66 1.20 540.62 0.00 541.64 0.00 542.66 0.74 543.68 1.21 540.64 0.00 541.66 0.00 542.68 0.75 543.70 1.21 540.66 0.00 541.68 0.00 542.70 0.76 543.72 1.22 540.68 0.00 541.70 0.00 542.72 0.77 543.74 1.23 540.70 0.00 541.72 0.00 542.74 0.79 543.76 1.24 540.72 0.00 541.74 0.00 542.76 0.80 543.78 1.24 540.74 0.00 541.76 0.00 542.78 0.81 543.80 1.25 540.76 0.00 541.78 0.00 542.80 0.82 543.82 1.26 540.78 0.00 541.80 0.00 542.82 0.83 543.84 1.26 540.80 0.00 541.82 0.00 542.84 0.84 543.86 1.27 540.82 0.00 541.84 0.01 542.86 0.85 543.88 1.28 540.84 0.00 541.86 0.01 542.88 0.86 543.90 1.29 540.86 0.00 541.88 0.02 542.90 0.87

.85 543.88 1.28 540.84 0.00 541.86 0.01 542.88 0.86 543.90 1.29 540.86 0.00 541.88 0.02 542.90 0.87 543.92 1.29 540.88 0.00 541.90 0.03 542.92 0.88 543.94 1.30 540.90 0.00 541.92 0.04 542.94 0.89 543.96 1.31 540.92 0.00 541.94 0.06 542.96 0.90 543.98 1.31 540.94 0.00 541.96 0.07 542.98 0.91 544.00 1.32 540.96 0.00 541.98 0.09 543.00 0.92 540.98 0.00 542.00 0.11 543.02 0.93 541.00 0.00 542.02 0.13 543.04 0.94 541.02 0.00 542.04 0.16 543.06 0.95 541.04 0.00 542.06 0.18 543.08 0.96 541.06 0.00 542.08 0.20 543.10 0.97 541.08 0.00 542.10 0.23 543.12 0.98 541.10 0.00 542.12 0.26 543.14 0.99 541.12 0.00 542.14 0.28 543.16 1.00 541.14 0.00 542.16 0.31 543.18 1.00 541.16 0.00 542.18 0.34 543.20 1.01 541.18 0.00 542.20 0.36 543.22 1.02 541.20 0.00 542.22 0.39 543.24 1.03 541.22 0.00 542.24 0.41 543.26 1.04 541.24 0.00 542.26 0.44 543.28 1.05 541.26 0.00 542.28 0.46 543.30 1.06 541.28 0.00 542.30 0.47 543.32 1.07 541.30 0.00 542.32 0.49 543.34 1.07 541.32 0.00 542.34 0.51 543.36 1.08 541.34 0.00 542.36 0.53 543.38 1.09 541.36 0.00 542.38 0.54 543.40 1.10 541.38 0.00 542.40 0.56 543.42 1.11 541.40 0.00 542.42 0.58 543.44 1.11 541.42 0.00 542.44 0.59 543.46 1.12 541.44 0.00 542.46 0.61 543.48 1.13 541.46 0.00 542.48 0.62 543.50

541.42 0.00 542.44 0.59 543.46 1.12 541.44 0.00 542.46 0.61 543.48 1.13 541.46 0.00 542.48 0.62 543.50 1.14 541.48 0.00 542.50 0.63 543.52 1.15 541.50 0.00 542.52 0.65 543.54 1.15

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 27 Stage-Area-Storage for Pond 37P: Pond 2-6 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 540.50 10,782 0 543.05 10,782 27,494 540.55 10,782 539 543.10 10,782 28,033 540.60 10,782 1,078 543.15 10,782 28,572 540.65 10,782 1,617 543.20 10,782 29,111 540.70 10,782 2,156 543.25 10,782 29,651 540.75 10,782 2,696 543.30 10,782 30,190 540.80 10,782 3,235 543.35 10,782 30,729 540.85 10,782 3,774 543.40 10,782 31,268 540.90 10,782 4,313 543.45 10,782 31,807 540.95 10,782 4,852 543.50 10,782 32,346 541.00 10,782 5,391 543.55 10,782 32,885 541.05 10,782 5,930 543.60 10,782 33,424 541.10 10,782 6,469 543.65 10,782 33,963 541.15 10,782 7,008 543.70 10,782 34,502 541.20 10,782 7,547 543.75 10,782 35,042 541.25 10,782 8,087 543.80 10,782 35,581 541.30 10,782 8,626 543.85 10,782 36,120 541.35 10,782 9,165 543.90 10,782 36,659 541.40 10,782 9,704 543.95 10,782 37,198 541.45 10,782 10,243 544.00 10,782 37,737 541.50 10,782 10,782 541.55 10,782 11,321 541.60 10,782 11,860 541.65 10,782 12,399 541.70 10,782