Drainage Report

.00 543.88 1.38 540.84 0.00 541.86 0.31 542.88 1.00 543.90 1.39 540.86 0.00 541.88 0.34 542.90 1.01 543.92 1.39 540.88 0.00 541.90 0.36 542.92 1.02 543.94 1.40 540.90 0.00 541.92 0.39 542.94 1.03 543.96 1.41 540.92 0.00 541.94 0.41 542.96 1.04 543.98 1.41 540.94 0.00 541.96 0.44 542.98 1.05 544.00 1.42 540.96 0.00 541.98 0.46 543.00 1.06 540.98 0.00 542.00 0.47 543.02 1.07 541.00 0.00 542.02 0.49 543.04 1.07 541.02 0.00 542.04 0.51 543.06 1.08 541.04 0.00 542.06 0.53 543.08 1.09 541.06 0.00 542.08 0.54 543.10 1.10 541.08 0.00 542.10 0.56 543.12 1.11 541.10 0.00 542.12 0.58 543.14 1.11 541.12 0.00 542.14 0.59 543.16 1.12 541.14 0.00 542.16 0.61 543.18 1.13 541.16 0.00 542.18 0.62 543.20 1.14 541.18 0.00 542.20 0.63 543.22 1.15 541.20 0.00 542.22 0.65 543.24 1.15 541.22 0.00 542.24 0.66 543.26 1.16 541.24 0.00 542.26 0.68 543.28 1.17 541.26 0.00 542.28 0.69 543.30 1.18 541.28 0.00 542.30 0.70 543.32 1.18 541.30 0.00 542.32 0.71 543.34 1.19 541.32 0.00 542.34 0.73 543.36 1.20 541.34 0.00 542.36 0.74 543.38 1.21 541.36 0.00 542.38 0.75 543.40 1.21 541.38 0.00 542.40 0.76 543.42 1.22 541.40 0.00 542.42 0.77 543.44 1.23 541.42 0.00 542.44 0.79 543.46 1.24 541.44 0.00 542.46 0.80 543.48 1.24 541.46 0.00 542.48 0.81 543.50

541.42 0.00 542.44 0.79 543.46 1.24 541.44 0.00 542.46 0.80 543.48 1.24 541.46 0.00 542.48 0.81 543.50 1.25 541.48 0.00 542.50 0.82 543.52 1.26 541.50 0.00 542.52 0.83 543.54 1.26

Basin 2-5 without exfiltration Proposed Basin 2-5 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-Area-Storage for Pond 39P: pond 2-5 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 540.50 11,558 0 543.05 11,558 29,473 540.55 11,558 578 543.10 11,558 30,051 540.60 11,558 1,156 543.15 11,558 30,629 540.65 11,558 1,734 543.20 11,558 31,207 540.70 11,558 2,312 543.25 11,558 31,785 540.75 11,558 2,890 543.30 11,558 32,362 540.80 11,558 3,467 543.35 11,558 32,940 540.85 11,558 4,045 543.40 11,558 33,518 540.90 11,558 4,623 543.45 11,558 34,096 540.95 11,558 5,201 543.50 11,558 34,674 541.00 11,558 5,779 543.55 11,558 35,252 541.05 11,558 6,357 543.60 11,558 35,830 541.10 11,558 6,935 543.65 11,558 36,408 541.15 11,558 7,513 543.70 11,558 36,986 541.20 11,558 8,091 543.75 11,558 37,564 541.25 11,558 8,669 543.80 11,558 38,141 541.30 11,558 9,246 543.85 11,558 38,719 541.35 11,558 9,824 543.90 11,558 39,297 541.40 11,558 10,402 543.95 11,558 39,875 541.45 11,558 10,980 544.00 11,558 40,453 541.50 11,558 11,558 541.55 11,558 12,136 541.60 11,558 12,714 541.65 11,558 13,292 541.70 11,558

40,453 541.50 11,558 11,558 541.55 11,558 12,136 541.60 11,558 12,714 541.65 11,558 13,292 541.70 11,558 13,870 541.75 11,558 14,448 541.80 11,558 15,025 541.85 11,558 15,603 541.90 11,558 16,181 541.95 11,558 16,759 542.00 11,558 17,337 542.05 11,558 17,915 542.10 11,558 18,493 542.15 11,558 19,071 542.20 11,558 19,649 542.25 11,558 20,227 542.30 11,558 20,804 542.35 11,558 21,382 542.40 11,558 21,960 542.45 11,558 22,538 542.50 11,558 23,116 542.55 11,558 23,694 542.60 11,558 24,272 542.65 11,558 24,850 542.70 11,558 25,428 542.75 11,558 26,006 542.80 11,558 26,583 542.85 11,558 27,161 542.90 11,558 27,739 542.95 11,558 28,317 543.00 11,558 28,895

Basin 2-5 without exfiltration Proposed Basin 2-5 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 18 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 38S: Basin 2-5 Runoff Area=71,875 sf Runoff Depth=4.98" Flow Length=1,020' Tc=10.0 min CN=98/98 Runoff=7.02 cfs 0.685 af Subcatchment 42S: Basin 2-5 predevelopment Runoff Area=71,875 sf Runoff Depth=2.20" Flow Length=220' Tc=13.2 min CN=70/0 Runoff=3.24 cfs 0.303 af Pond 39P: pond 2-5 Peak Elev=542.21' Storage=19,784 cf Inflow=7.02 cfs 0.685 af Outflow=0.64 cfs 0.415 af Total Runoff Area = 3.300 ac Runoff Volume = 0.988 af Average Runoff Depth = 3.59"

Basin 2-5 without exfiltration Proposed Basin 2-5 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 19 Summary for Subcatchment 38S: Basin 2-5 [47] Hint: Peak is 593% of capacity of segment #2 Runoff = 7.02 cfs @ 12.17 hrs, Volume= 0.685 af, Depth= 4.98" Routed to Pond 39P : pond 2-5 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 60,317 98 Roofs, HSG C 11,558 98 Water Surface, 0% imp, HSG C 71,875 98 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.5 100 0.0100 1.08 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.44" 3.0 920 0.0410 5.17 1.18 Pipe Channel, 12.0" Round w/ 8.0" inside fill Area= 0.2 sf Perim= 2.2' r= 0.11' n= 0.013 4.5 1,020 Total, Increased to minimum Tc = 10.0 min Subcatchment 38S: Basin 2-5 Hydrograph Runoff 7.02 cfs 7 NOAA 24-hr D 6 10-Year

NOAA 24-hr D 6 10-Year Rainfall=5.22" Runoff Area=71,875 sf 5 Runoff Volume=0.685 af Flow (cfs) 4 Runoff Depth=4.98" Flow Length=1,020' 3 Tc=10.0 min 2 CN=98/98 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 2-5 without exfiltration Proposed Basin 2-5 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 20 Hydrograph for Subcatchment 38S: Basin 2-5 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 0.04 0.04 0.07 5.00 0.36 0.19 0.19 0.12 7.50 0.61 0.42 0.42 0.19 10.00 1.03 0.82 0.82 0.38 12.50 3.57 3.33 3.33 1.86 15.00 4.39 4.16 4.16 0.30 17.50 4.73 4.49 4.49 0.18 20.00 4.95 4.71 4.71 0.13 22.50 5.13 4.89 4.89 0.11 25.00 5.22 4.98 4.98 0.00 27.50 5.22 4.98 4.98 0.00 30.00 5.22 4.98 4.98 0.00 32.50 5.22 4.98 4.98 0.00 35.00 5.22 4.98 4.98 0.00 37.50 5.22 4.98 4.98 0.00 40.00 5.22 4.98 4.98 0.00 42.50 5.22 4.98 4.98 0.00 45.00 5.22 4.98 4.98 0.00 47.50 5.22 4.98 4.98 0.00 50.00 5.22 4.98 4.98 0.00 52.50 5.22 4.98 4.98 0.00 55.00 5.22 4.98 4.98 0.00 57.50 5.22 4.98 4.98 0.00 60.00 5.22 4.98 4.98 0.00 62.50 5.22 4.98 4.98 0.00 65.00 5.22 4.98 4.98 0.00 67.50 5.22 4.98 4.98 0.00 70.00 5.22 4.98 4.98 0.00

Basin 2-5 without exfiltration Proposed Basin 2-5 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 2-5 predevelopment Runoff = 3.24 cfs @ 12.22 hrs, Volume= 0.303 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 71,875 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.9 100 0.0800 0.14 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 1.3 120 0.1000 1.58 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 13.2 220 Total Subcatchment 42S: Basin 2-5 predevelopment Hydrograph Runoff 3.24 cfs NOAA 24-hr D 3 10-Year Rainfall=5.22" Runoff Area=71,875 sf Runoff Volume=0.303 af Flow (cfs) 2 Runoff Depth=2.20"

0.303 af Flow (cfs) 2 Runoff Depth=2.20" Flow Length=220' Tc=13.2 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)