Drainage Report

Basin 2-3 without exfiltration Proposed Basin 2-3 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 28 Stage-Discharge for Pond 44P: pond 2-3 Elevation Primary Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) (feet) (cfs) 542.00 0.00 543.02 0.00 544.04 0.94 545.06 2.17 542.02 0.00 543.04 0.00 544.06 0.98 545.08 2.19 542.04 0.00 543.06 0.00 544.08 1.02 545.10 2.21 542.06 0.00 543.08 0.00 544.10 1.06 545.12 2.22 542.08 0.00 543.10 0.00 544.12 1.10 545.14 2.24 542.10 0.00 543.12 0.00 544.14 1.13 545.16 2.25 542.12 0.00 543.14 0.00 544.16 1.17 545.18 2.27 542.14 0.00 543.16 0.00 544.18 1.21 545.20 2.29 542.16 0.00 543.18 0.00 544.20 1.24 545.22 2.30 542.18 0.00 543.20 0.00 544.22 1.28 545.24 2.32 542.20 0.00 543.22 0.00 544.24 1.31 545.26 2.33 542.22 0.00 543.24 0.01 544.26 1.33 545.28 2.35 542.24 0.00 543.26 0.01 544.28 1.36 545.30 2.36 542.26 0.00 543.28 0.02 544.30 1.39 545.32 2.38 542.28 0.00 543.30 0.03 544.32 1.42 545.34 2.39 542.30 0.00 543.32 0.04 544.34 1.44 545.36 2.41 542.32 0.00 543.34 0.06 544.36 1.47 545.38 2.42 542.34 0.00 543.36 0.07 544.38 1.49 545.40 2.44 542.36 0.00 543.38 0.09 544.40 1.52

.47 545.38 2.42 542.34 0.00 543.36 0.07 544.38 1.49 545.40 2.44 542.36 0.00 543.38 0.09 544.40 1.52 545.42 2.45 542.38 0.00 543.40 0.11 544.42 1.54 545.44 2.47 542.40 0.00 543.42 0.13 544.44 1.57 545.46 2.48 542.42 0.00 543.44 0.16 544.46 1.59 545.48 2.50 542.44 0.00 543.46 0.18 544.48 1.61 545.50 2.51 542.46 0.00 543.48 0.20 544.50 1.64 545.52 2.53 542.48 0.00 543.50 0.23 544.52 1.66 545.54 2.54 542.50 0.00 543.52 0.26 544.54 1.68 545.56 2.55 542.52 0.00 543.54 0.28 544.56 1.70 545.58 2.57 542.54 0.00 543.56 0.31 544.58 1.73 545.60 2.58 542.56 0.00 543.58 0.34 544.60 1.75 545.62 2.60 542.58 0.00 543.60 0.36 544.62 1.77 545.64 2.61 542.60 0.00 543.62 0.39 544.64 1.79 545.66 2.62 542.62 0.00 543.64 0.41 544.66 1.81 545.68 2.64 542.64 0.00 543.66 0.44 544.68 1.83 545.70 2.65 542.66 0.00 543.68 0.46 544.70 1.85 545.72 2.66 542.68 0.00 543.70 0.47 544.72 1.87 545.74 2.68 542.70 0.00 543.72 0.49 544.74 1.89 545.76 2.69 542.72 0.00 543.74 0.51 544.76 1.91 545.78 2.70 542.74 0.00 543.76 0.53 544.78 1.93 545.80 2.72 542.76 0.00 543.78 0.55 544.80 1.94 545.82 2.73 542.78 0.00 543.80 0.57 544.82 1.96 545.84 2.74 542.80 0.00 543.82 0.59 544.84 1.98 545.86 2.76 542.82 0.00 543.84 0.61 544.86

2 1.96 545.84 2.74 542.80 0.00 543.82 0.59 544.84 1.98 545.86 2.76 542.82 0.00 543.84 0.61 544.86 2.00 545.88 2.77 542.84 0.00 543.86 0.64 544.88 2.02 545.90 2.78 542.86 0.00 543.88 0.67 544.90 2.04 545.92 2.80 542.88 0.00 543.90 0.70 544.92 2.05 545.94 2.81 542.90 0.00 543.92 0.73 544.94 2.07 545.96 2.82 542.92 0.00 543.94 0.76 544.96 2.09 545.98 2.83 542.94 0.00 543.96 0.80 544.98 2.11 546.00 2.85 542.96 0.00 543.98 0.83 545.00 2.12 542.98 0.00 544.00 0.87 545.02 2.14 543.00 0.00 544.02 0.91 545.04 2.16

Basin 2-3 without exfiltration Proposed Basin 2-3 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 29 Stage-Area-Storage for Pond 44P: pond 2-3 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 542.00 10,412 0 544.55 10,412 26,551 542.05 10,412 521 544.60 10,412 27,071 542.10 10,412 1,041 544.65 10,412 27,592 542.15 10,412 1,562 544.70 10,412 28,112 542.20 10,412 2,082 544.75 10,412 28,633 542.25 10,412 2,603 544.80 10,412 29,154 542.30 10,412 3,124 544.85 10,412 29,674 542.35 10,412 3,644 544.90 10,412 30,195 542.40 10,412 4,165 544.95 10,412 30,715 542.45 10,412 4,685 545.00 10,412 31,236 542.50 10,412 5,206 545.05 10,412 31,757 542.55 10,412 5,727 545.10 10,412 32,277 542.60 10,412 6,247 545.15 10,412 32,798 542.65 10,412 6,768 545.20 10,412 33,318 542.70 10,412 7,288 545.25 10,412 33,839 542.75 10,412 7,809 545.30 10,412 34,360 542.80 10,412 8,330 545.35 10,412 34,880 542.85 10,412 8,850 545.40 10,412 35,401 542.90 10,412 9,371 545.45 10,412 35,921 542.95 10,412 9,891 545.50 10,412 36,442 543.00 10,412 10,412 545.55 10,412 36,963 543.05 10,412 10,933 545.60 10,412 37,483 543.10 10,412

36,442 543.00 10,412 10,412 545.55 10,412 36,963 543.05 10,412 10,933 545.60 10,412 37,483 543.10 10,412 11,453 545.65 10,412 38,004 543.15 10,412 11,974 545.70 10,412 38,524 543.20 10,412 12,494 545.75 10,412 39,045 543.25 10,412 13,015 545.80 10,412 39,566 543.30 10,412 13,536 545.85 10,412 40,086 543.35 10,412 14,056 545.90 10,412 40,607 543.40 10,412 14,577 545.95 10,412 41,127 543.45 10,412 15,097 546.00 10,412 41,648 543.50 10,412 15,618 543.55 10,412 16,139 543.60 10,412 16,659 543.65 10,412 17,180 543.70 10,412 17,700 543.75 10,412 18,221 543.80 10,412 18,742 543.85 10,412 19,262 543.90 10,412 19,783 543.95 10,412 20,303 544.00 10,412 20,824 544.05 10,412 21,345 544.10 10,412 21,865 544.15 10,412 22,386 544.20 10,412 22,906 544.25 10,412 23,427 544.30 10,412 23,948 544.35 10,412 24,468 544.40 10,412 24,989 544.45 10,412 25,509 544.50 10,412 26,030

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 30 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 40S: Basin 2-3 Runoff Area=98,395 sf Runoff Depth=7.19" Flow Length=1,558' Tc=10.5 min CN=79/98 Runoff=14.34 cfs 1.353 af Subcatchment 45S: basin 2-3 pre-development Runoff Area=99,393 sf Runoff Depth=5.04" Flow Length=280' Tc=12.2 min CN=70/0 Runoff=10.64 cfs 0.958 af Pond 44P: pond 2-3 Peak Elev=545.17' Storage=32,959 cf Inflow=14.34 cfs 1.353 af Outflow=2.26 cfs 1.063 af Total Runoff Area = 4.541 ac Runoff Volume = 2.311 af Average Runoff Depth = 6.11"

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 31 Summary for Subcatchment 40S: Basin 2-3 Runoff = 14.34 cfs @ 12.18 hrs, Volume= 1.353 af, Depth= 7.19" Routed to Pond 44P : pond 2-3 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 100-Year Rainfall=8.66" Area (sf) CN Description 41,793 74 >75% Grass cover, Good, HSG C 46,190 98 Roofs, HSG C 10,412 98 Water Surface, 0% imp, HSG C 98,395 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 8.0 100 0.0300 0.21 Sheet Flow, Grass: Short n= 0.150 P2= 3.44" 0.4 60 0.0330 2.72 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.2 72 0.0800 5.74 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 1,326 0.0300 11.85 14.55 Pipe Channel, 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.010 10.5 1,558 Total

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 32 Subcatchment 40S: Basin 2-3 Hydrograph 16 Runoff 15 14.34 cfs 14 NOAA 24-hr D 13 100-Year Rainfall=8.66" 12 11 Runoff Area=98,395 sf 10 Runoff Volume=1.353 af Flow (cfs) 9 8 Runoff Depth=7.19" 7 Flow Length=1,558' 6 Tc=10.5 min 5 4 CN=79/98 3 2 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 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 33 Hydrograph for Subcatchment 40S: Basin 2-3 Time Precip. Perv.Excess Imp.Excess Runoff (hours) (inches) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 0.00 2.50 0.27 0.00 0.12 0.09 5.00 0.59 0.00 0.40 0.14 7.50 1.01 0.07 0.80 0.28 10.00 1.72 0.36 1.49 0.65 12.50 5.91 3.58 5.68 4.07 15.00 7.29 4.82 7.05 0.65 17.50 7.84 5.33 7.60 0.39 20.00 8.21 5.67 7.97 0.29 22.50 8.51 5.96 8.27 0.24 25.00 8.66 6.10 8.42 0.00 27.50 8.66 6.10 8.42 0.00 30.00 8.66 6.10 8.42 0.00 32.50 8.66 6.10 8.42 0.00 35.00 8.66 6.10 8.42 0.00 37.50 8.66 6.10 8.42 0.00 40.00 8.66 6.10 8.42 0.00 42.50 8.66 6.10 8.42 0.00 45.00 8.66 6.10 8.42 0.00 47.50 8.66 6.10 8.42 0.00 50.00 8.66 6.10 8.42 0.00 52.50 8.66 6.10 8.42 0.00 55.00 8.66 6.10 8.42 0.00 57.50 8.66 6.10 8.42 0.00 60.00 8.66 6.10 8.42 0.00 62.50 8.66 6.10 8.42 0.00 65.00 8.66 6.10 8.42 0.00 67.50 8.66 6.10 8.42 0.00 70.00 8.66 6.10 8.42 0.00

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 45S: basin 2-3 pre-development Runoff = 10.64 cfs @ 12.20 hrs, Volume= 0.958 af, Depth= 5.04" 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 100-Year Rainfall=8.66" Area (sf) CN Description 99,393 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.1 100 0.1200 0.16 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 2.1 180 0.0830 1.44 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 12.2 280 Total Subcatchment 45S: basin 2-3 pre-development Hydrograph Runoff 11 10.64 cfs 10 NOAA 24-hr D 9 100-Year Rainfall=8.66" 8 Runoff Area=99,393 sf 7 Runoff Volume=0.958 af Flow (cfs) 6 Runoff