Drainage Report

Basin 1 without exfiltration Proposed basin 1 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 Summary for Subcatchment 36S: Basin 1 Predevelopment Runoff = 11.02 cfs @ 12.46 hrs, Volume= 1.553 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 368,926 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 36S: Basin 1 Predevelopment Hydrograph 12 Runoff 11.02 cfs 11 NOAA 24-hr D 10 10-Year Rainfall=5.22" 9 Runoff Area=368,926 sf 8 Runoff Volume=1.553 af 7 Flow (cfs) Runoff

Runoff Volume=1.553 af 7 Flow (cfs) Runoff Depth=2.20" 6 Flow Length=1,360' 5 4 Tc=31.9 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 1 without exfiltration Proposed basin 1 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 Hydrograph for Subcatchment 36S: Basin 1 Predevelopment 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 0.06 12.50 3.57 1.05 0.00 10.90 15.00 4.39 1.60 0.00 1.22 17.50 4.73 1.83 0.00 0.71 20.00 4.95 2.00 0.00 0.52 22.50 5.13 2.13 0.00 0.44 25.00 5.22 2.20 0.00 0.01 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 1 without exfiltration Proposed basin 1 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 Summary for Pond 29P: Basin 1 Inflow Area = 7.230 ac, Inflow Depth = 4.04" for 10-Year event Inflow = 16.45 cfs @ 12.41 hrs, Volume= 2.435 af Outflow = 0.75 cfs @ 17.63 hrs, Volume= 0.891 af, Atten= 95%, Lag= 312.9 min Primary = 0.75 cfs @ 17.63 hrs, Volume= 0.891 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.44' @ 17.63 hrs Surf.Area= 35,635 sf Storage= 84,135 cf Plug-Flow detention time= 838.1 min calculated for 0.891 af (37% of inflow) Center-of-Mass det. time= 660.0 min ( 1,454.5 - 794.5 ) Volume Invert Avail.Storage Storage Description #1 540.50' 191,393 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 21,047 0 0 542.00 29,152 37,649 37,649 544.00 38,188 67,340 104,989 546.00 48,216 86,404 191,393 Device Routing Invert Outlet Devices #1 Primary 542.90' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.75 cfs @ 17.63 hrs HW=543.44' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.75 cfs @ 2.49 fps)

Basin 1 without exfiltration Proposed basin 1 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 30 Pond 29P: Basin 1 Hydrograph Inflow 18 16.45 cfs Primary 17 16 Inflow Area=7.230 ac 15 14 Peak Elev=543.44' 13 Storage=84,135 cf 12 11 Flow (cfs) 10 9 8 7 6 5 4 3 2 0.75 cfs 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 1 without exfiltration Proposed basin 1 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 31 Hydrograph for Pond 29P: Basin 1 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic-feet) (feet) (cfs) 0.00 0.00 0 540.50 0.00 2.50 0.16 426 540.52 0.00 5.00 0.31 2,573 540.62 0.00 7.50 0.48 5,932 540.77 0.00 10.00 0.98 11,821 541.03 0.00 12.50 15.54 48,085 542.35 0.00 15.00 1.34 81,627 543.36 0.60 17.50 0.77 84,132 543.43 0.75 20.00 0.56 83,229 543.41 0.70 22.50 0.46 81,880 543.37 0.62 25.00 0.01 79,733 543.31 0.49 27.50 0.00 76,246 543.21 0.30 30.00 0.00 74,032 543.15 0.20 32.50 0.00 72,535 543.10 0.14 35.00 0.00 71,472 543.07 0.10 37.50 0.00 70,673 543.05 0.08 40.00 0.00 70,066 543.03 0.06 42.50 0.00 69,584 543.02 0.05 45.00 0.00 69,185 543.00 0.04 47.50 0.00 68,855 542.99 0.03 50.00 0.00 68,581 542.99 0.03 52.50 0.00 68,354 542.98 0.02 55.00 0.00 68,165 542.97 0.02 57.50 0.00 67,996 542.97 0.02 60.00 0.00 67,843 542.96 0.02 62.50 0.00 67,703 542.96 0.01 65.00 0.00 67,575 542.96 0.01 67.50 0.00 67,458 542.95 0.01 70.00 0.00 67,351 542.95 0.01

Basin 1 without exfiltration Proposed basin 1 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 32 Stage-Discharge for Pond 29P: Basin 1 Elevation Primary Elevation Primary Elevation Primary (feet) (cfs) (feet) (cfs) (feet) (cfs) 540.50 0.00 543.05 0.08 545.60 2.59 540.55 0.00 543.10 0.13 545.65 2.61 540.60 0.00 543.15 0.20 545.70 2.64 540.65 0.00 543.20 0.28 545.75 2.67 540.70 0.00 543.25 0.37 545.80 2.69 540.75 0.00 543.30 0.47 545.85 2.72 540.80 0.00 543.35 0.57 545.90 2.74 540.85 0.00 543.40 0.68 545.95 2.77 540.90 0.00 543.45 0.78 546.00 2.80 540.95 0.00 543.50 0.87 541.00 0.00 543.55 0.95 541.05 0.00 543.60 1.02 541.10 0.00 543.65 1.08 541.15 0.00 543.70 1.15 541.20 0.00 543.75 1.21 541.25 0.00 543.80 1.27 541.30 0.00 543.85 1.32 541.35 0.00 543.90 1.37 541.40 0.00 543.95 1.42 541.45 0.00 544.00 1.47 541.50 0.00 544.05 1.52 541.55 0.00 544.10 1.56 541.60 0.00 544.15 1.61 541.65 0.00 544.20 1.65 541.70 0.00 544.25 1.69 541.75 0.00 544.30 1.74 541.80 0.00 544.35 1.78 541.85 0.00 544.40 1.82 541.90 0.00 544.45 1.85 541.95 0.00 544.50 1.89 542.00 0.00 544.55 1.93 542.05 0.00 544.60 1.96 542.10 0.00 544.65 2.00 542.15 0.00 544.70 2.04 542.20 0.00 544.75 2.07 542.25 0.00 544.80 2.10 542.30 0.00 544.85

0.00 544.65 2.00 542.15 0.00 544.70 2.04 542.20 0.00 544.75 2.07 542.25 0.00 544.80 2.10 542.30 0.00 544.85 2.14 542.35 0.00 544.90 2.17 542.40 0.00 544.95 2.20 542.45 0.00 545.00 2.23 542.50 0.00 545.05 2.27 542.55 0.00 545.10 2.30 542.60 0.00 545.15 2.33 542.65 0.00 545.20 2.36 542.70 0.00 545.25 2.39 542.75 0.00 545.30 2.42 542.80 0.00 545.35 2.45 542.85 0.00 545.40 2.47 542.90 0.00 545.45 2.50 542.95 0.01 545.50 2.53 543.00 0.04 545.55 2.56

Basin 1 without exfiltration Proposed basin 1 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 33 Stage-Area-Storage for Pond 29P: Basin 1 Elevation Surface Storage Elevation Surface Storage (feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet) 540.50 21,047 0 545.60 46,210 172,508 540.60 21,587 2,132 545.70 46,712 177,154 540.70 22,128 4,317 545.80 47,213 181,850 540.80 22,668 6,557 545.90 47,715 186,597 540.90 23,208 8,851 546.00 48,216 191,393 541.00 23,749 11,199 541.10 24,289 13,601 541.20 24,829 16,057 541.30 25,370 18,567 541.40 25,910 21,131 541.50 26,450 23,749 541.60 26,991 26,421 541.70 27,531 29,147 541.80 28,071 31,927 541.90 28,612 34,761 542.00 29,152 37,649 542.10 29,604 40,587 542.20 30,056 43,570 542.30 30,507 46,598 542.40 30,959 49,671 542.50 31,411 52,790 542.60 31,863 55,954 542.70 32,315 59,163 542.80 32,766 62,417 542.90 33,218 65,716 543.00 33,670 69,060 543.10 34,122 72,450 543.20 34,574 75,885 543.30 35,025 79,365 543.40 35,477 82,890 543.50 35,929 86,460 543.60 36,381 90,075 543.70 36,833 93,736 543.80 37,284 97,442 543.90 37,736 101,193 544.00 38,188 104,989 544.10 38,689 108,833 544.20 39,191 112,727 544.30 39,692 116,671 544.40 40,194 120,666 544.50 40,695 124,710 544.60

38,689 108,833 544.20 39,191 112,727 544.30 39,692 116,671 544.40 40,194 120,666 544.50 40,695 124,710 544.60 41,196 128,805 544.70 41,698 132,949 544.80 42,199 137,144 544.90 42,701 141,389 545.00 43,202 145,684 545.10 43,703 150,030 545.20 44,205 154,425 545.30 44,706 158,870 545.40 45,208 163,366 545.50 45,709 167,912