Drainage Report

Basin 2-1 Proposed Basin 2-1 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 4 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 1.326 74 >75% Grass cover, Good, HSG C (33S, 40S) 0.014 98 Roofs, HSG C (40S) 0.046 98 Water Surface, 0% imp, HSG C (40S) 10.685 70 Woods, Good, HSG C (34S) 12.072 71 TOTAL AREA

Basin 2-1 Proposed Basin 2-1 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 5 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 0.000 HSG B 12.072 HSG C 33S, 34S, 40S 0.000 HSG D 0.000 Other 12.072 TOTAL AREA

Basin 2-1 Proposed Basin 2-1 R5 Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 6 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 0.000 1.326 0.000 0.000 1.326 >75% Grass cover, Good 33S, 40S 0.000 0.000 0.014 0.000 0.000 0.014 Roofs 40S 0.000 0.000 0.046 0.000 0.000 0.046 Water Surface, 0% imp 40S 0.000 0.000 10.685 0.000 0.000 10.685 Woods, Good 34S 0.000 0.000 12.072 0.000 0.000 12.072 TOTAL AREA

Basin 2-1 Proposed Basin 2-1 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 7 Time span=0.00-72.00 hrs, dt=0.05 hrs, 1441 points Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 33S: All basin's 2 undetained Runoff Area=34,308 sf Runoff Depth=1.20" Flow Length=36' Slope=0.1600 '/' Tc=10.0 min CN=74/0 Runoff=0.91 cfs 0.079 af Subcatchment 34S: Pre-dev basin 2 All Runoff Area=465,453 sf Runoff Depth=0.97" Flow Length=1,360' Tc=31.9 min CN=70/0 Runoff=5.69 cfs 0.865 af Subcatchment 40S: Basin 2-1 Runoff Area=26,074 sf Runoff Depth=1.36" Flow Length=190' Tc=10.0 min CN=76/98 Runoff=0.79 cfs 0.068 af Pond 41P: Pond 2-1 Peak Elev=547.05' Storage=2,121 cf Inflow=0.79 cfs 0.068 af Outflow=0.04 cfs 0.024 af Total Runoff Area = 12.072 ac Runoff Volume = 1.011 af Average Runoff Depth = 1.01"

Basin 2-1 Proposed Basin 2-1 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 8 Summary for Subcatchment 33S: All basin's 2 undetained Runoff = 0.91 cfs @ 12.18 hrs, Volume= 0.079 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 34,308 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 36 0.1600 0.15 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 4.0 36 Total, Increased to minimum Tc = 10.0 min Subcatchment 33S: All basin's 2 undetained Hydrograph 1 Runoff 0.91 cfs NOAA 24-hr D 2-Year Rainfall=3.44" Runoff Area=34,308 sf Runoff Volume=0.079 af Flow (cfs) Runoff Depth=1.20" Flow Length=36'

Depth=1.20" Flow Length=36' Slope=0.1600 '/' 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 2-1 Proposed Basin 2-1 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 9 Summary for Subcatchment 34S: Pre-dev basin 2 All Runoff = 5.69 cfs @ 12.49 hrs, Volume= 0.865 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 465,453 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 34S: Pre-dev basin 2 All Hydrograph Runoff 6 5.69 cfs NOAA 24-hr D 5 2-Year Rainfall=3.44" Runoff Area=465,453 sf 4 Runoff Volume=0.865 af Flow (cfs) Runoff Depth=0.97" 3 Flow Length=1,360'

Runoff Depth=0.97" 3 Flow Length=1,360' Tc=31.9 min 2 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 2-1 Proposed Basin 2-1 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 10 Summary for Subcatchment 40S: Basin 2-1 Runoff = 0.79 cfs @ 12.18 hrs, Volume= 0.068 af, Depth= 1.36" Routed to Pond 41P : Pond 2-1 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 23,447 74 >75% Grass cover, Good, HSG C 607 98 Roofs, HSG C 2,020 98 Water Surface, 0% imp, HSG C 26,074 76 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.1 100 0.0600 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.5 90 0.0340 2.77 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 6.6 190 Total, Increased to minimum Tc = 10.0 min Subcatchment 40S: Basin 2-1 Hydrograph 0.85 Runoff 0.79 cfs 0.8 0.75 NOAA 24-hr D 0.7 2-Year Rainfall=3.44" 0.65 0.6

NOAA 24-hr D 0.7 2-Year Rainfall=3.44" 0.65 0.6 Runoff Area=26,074 sf 0.55 Runoff Volume=0.068 af 0.5 Flow (cfs) 0.45 Runoff Depth=1.36" 0.4 Flow Length=190' 0.35 0.3 Tc=10.0 min 0.25 CN=76/98 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)