Drainage Report

Runoff Volume=0.958 af Flow (cfs) 6 Runoff Depth=5.04" 5 Flow Length=280' 4 Tc=12.2 min 3 CN=70/0 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 35 Hydrograph for Subcatchment 45S: basin 2-3 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 0.27 0.00 0.00 0.00 5.00 0.59 0.00 0.00 0.00 7.50 1.01 0.01 0.00 0.02 10.00 1.72 0.14 0.00 0.25 12.50 5.91 2.74 0.00 3.73 15.00 7.29 3.86 0.00 0.58 17.50 7.84 4.33 0.00 0.35 20.00 8.21 4.64 0.00 0.27 22.50 8.51 4.90 0.00 0.22 25.00 8.66 5.04 0.00 0.00 27.50 8.66 5.04 0.00 0.00 30.00 8.66 5.04 0.00 0.00 32.50 8.66 5.04 0.00 0.00 35.00 8.66 5.04 0.00 0.00 37.50 8.66 5.04 0.00 0.00 40.00 8.66 5.04 0.00 0.00 42.50 8.66 5.04 0.00 0.00 45.00 8.66 5.04 0.00 0.00 47.50 8.66 5.04 0.00 0.00 50.00 8.66 5.04 0.00 0.00 52.50 8.66 5.04 0.00 0.00 55.00 8.66 5.04 0.00 0.00 57.50 8.66 5.04 0.00 0.00 60.00 8.66 5.04 0.00 0.00 62.50 8.66 5.04 0.00 0.00 65.00 8.66 5.04 0.00 0.00 67.50 8.66 5.04 0.00 0.00 70.00 8.66 5.04 0.00 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 36 Summary for Pond 44P: pond 2-3 Inflow Area = 2.259 ac, Inflow Depth = 7.19" for 100-Year event Inflow = 14.34 cfs @ 12.18 hrs, Volume= 1.353 af Outflow = 2.26 cfs @ 12.85 hrs, Volume= 1.063 af, Atten= 84%, Lag= 40.5 min Primary = 2.26 cfs @ 12.85 hrs, Volume= 1.063 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 545.17' @ 12.85 hrs Surf.Area= 10,412 sf Storage= 32,959 cf Plug-Flow detention time= 325.2 min calculated for 1.063 af (79% of inflow) Center-of-Mass det. time= 239.4 min ( 1,015.4 - 776.0 ) Volume Invert Avail.Storage Storage Description #1 542.00' 41,648 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 10,412 0 0 546.00 10,412 41,648 41,648 Device Routing Invert Outlet Devices #1 Primary 543.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.75' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.26 cfs @ 12.85 hrs HW=545.17' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.24 cfs @ 6.31 fps) 2=Orifice/Grate (Orifice Controls 1.02 cfs @ 5.20 fps)

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 37 Pond 44P: pond 2-3 Hydrograph Inflow 16 Primary 14.34 cfs 15 14 Inflow Area=2.259 ac 13 Peak Elev=545.17' 12 11 Storage=32,959 cf 10 Flow (cfs) 9 8 7 6 5 4 3 2.26 cfs 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 38 Hydrograph for Pond 44P: pond 2-3 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 542.00 0.00 2.50 0.09 399 542.04 0.00 5.00 0.14 1,469 542.14 0.00 7.50 0.28 3,239 542.31 0.00 10.00 0.65 6,926 542.67 0.00 12.50 4.07 32,036 545.08 2.19 15.00 0.65 26,114 544.51 1.65 17.50 0.39 20,153 543.94 0.76 20.00 0.29 17,810 543.71 0.48 22.50 0.24 16,519 543.59 0.34 25.00 0.00 15,311 543.47 0.19 27.50 0.00 14,201 543.36 0.08 30.00 0.00 13,697 543.32 0.04 32.50 0.00 13,413 543.29 0.02 35.00 0.00 13,236 543.27 0.02 37.50 0.00 13,110 543.26 0.01 40.00 0.00 13,018 543.25 0.01 42.50 0.00 12,950 543.24 0.01 45.00 0.00 12,901 543.24 0.00 47.50 0.00 12,859 543.24 0.00 50.00 0.00 12,822 543.23 0.00 52.50 0.00 12,788 543.23 0.00 55.00 0.00 12,758 543.23 0.00 57.50 0.00 12,731 543.22 0.00 60.00 0.00 12,707 543.22 0.00 62.50 0.00 12,685 543.22 0.00 65.00 0.00 12,665 543.22 0.00 67.50 0.00 12,648 543.21 0.00 70.00 0.00 12,632 543.21 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 39 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

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 1.52 545.42 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 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 40 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