Drainage Report

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 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 20 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

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 21 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 28S: Basin 1 Runoff Area=314,926 sf Runoff Depth=4.04" Flow Length=1,759' Tc=30.2 min CN=74/98 Runoff=16.45 cfs 2.435 af Subcatchment 32S: Basin 1 Undetained Runoff Area=51,560 sf Runoff Depth=2.54" Flow Length=70' Slope=0.0800 '/' Tc=10.0 min CN=74/0 Runoff=2.97 cfs 0.251 af Subcatchment 36S: Basin 1 Predevelopment Runoff Area=368,926 sf Runoff Depth=2.20" Flow Length=1,360' Tc=31.9 min CN=70/0 Runoff=11.02 cfs 1.553 af Pond 29P: Basin 1 Peak Elev=543.44' Storage=84,135 cf Inflow=16.45 cfs 2.435 af Outflow=0.75 cfs 0.891 af Total Runoff Area = 16.883 ac Runoff Volume = 4.239 af Average Runoff Depth = 3.01"

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 22 Summary for Subcatchment 28S: Basin 1 [47] Hint: Peak is 418% of capacity of segment #4 Runoff = 16.45 cfs @ 12.41 hrs, Volume= 2.435 af, Depth= 4.04" Routed to Pond 29P : Basin 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 10-Year Rainfall=5.22" Area (sf) CN Description 193,625 98 Paved parking, HSG C 121,301 74 >75% Grass cover, Good, HSG C 314,926 89 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 24.0 100 0.0050 0.07 Sheet Flow, grass Grass: Dense n= 0.240 P2= 3.44" 0.6 144 0.0690 3.94 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 3.7 642 0.0206 2.91 Shallow Concentrated Flow, Paved Kv= 20.3 fps 1.9 873 0.0520 7.62 3.93 Pipe Channel, 18.0" Round w/ 12.0" inside fill Area= 0.5 sf Perim= 3.3' r= 0.16' n= 0.013 Corrugated PE, smooth interior 30.2 1,759 Total

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 23 Subcatchment 28S: Basin 1 Hydrograph 18 Runoff 17 16.45 cfs 16 NOAA 24-hr D 15 14 10-Year Rainfall=5.22" 13 Runoff Area=314,926 sf 12 11 Runoff Volume=2.435 af Flow (cfs) 10 Runoff Depth=4.04" 9 8 Flow Length=1,759' 7 6 Tc=30.2 min 5 CN=74/98 4 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 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 24 Hydrograph for Subcatchment 28S: Basin 1 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 0.04 0.16 5.00 0.36 0.00 0.19 0.31 7.50 0.61 0.00 0.42 0.48 10.00 1.03 0.03 0.82 0.98 12.50 3.57 1.29 3.33 15.54 15.00 4.39 1.89 4.16 1.34 17.50 4.73 2.15 4.49 0.77 20.00 4.95 2.32 4.71 0.56 22.50 5.13 2.47 4.89 0.46 25.00 5.22 2.54 4.98 0.01 27.50 5.22 2.54 4.98 0.00 30.00 5.22 2.54 4.98 0.00 32.50 5.22 2.54 4.98 0.00 35.00 5.22 2.54 4.98 0.00 37.50 5.22 2.54 4.98 0.00 40.00 5.22 2.54 4.98 0.00 42.50 5.22 2.54 4.98 0.00 45.00 5.22 2.54 4.98 0.00 47.50 5.22 2.54 4.98 0.00 50.00 5.22 2.54 4.98 0.00 52.50 5.22 2.54 4.98 0.00 55.00 5.22 2.54 4.98 0.00 57.50 5.22 2.54 4.98 0.00 60.00 5.22 2.54 4.98 0.00 62.50 5.22 2.54 4.98 0.00 65.00 5.22 2.54 4.98 0.00 67.50 5.22 2.54 4.98 0.00 70.00 5.22 2.54 4.98 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 25 Summary for Subcatchment 32S: Basin 1 Undetained Runoff = 2.97 cfs @ 12.18 hrs, Volume= 0.251 af, Depth= 2.54" 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 51,560 74 >75% Grass cover, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.9 70 0.0800 0.20 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 5.9 70 Total, Increased to minimum Tc = 10.0 min Subcatchment 32S: Basin 1 Undetained Hydrograph Runoff 2.97 cfs 3 NOAA 24-hr D 10-Year Rainfall=5.22" Runoff Area=51,560 sf 2 Runoff Volume=0.251 af Flow (cfs) Runoff Depth=2.54" Flow Length=70'

Runoff Depth=2.54" Flow Length=70' Slope=0.0800 '/' 1 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 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 26 Hydrograph for Subcatchment 32S: Basin 1 Undetained 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 0.03 0.00 0.04 12.50 3.57 1.29 0.00 0.91 15.00 4.39 1.89 0.00 0.16 17.50 4.73 2.15 0.00 0.10 20.00 4.95 2.32 0.00 0.08 22.50 5.13 2.47 0.00 0.06 25.00 5.22 2.54 0.00 0.00 27.50 5.22 2.54 0.00 0.00 30.00 5.22 2.54 0.00 0.00 32.50 5.22 2.54 0.00 0.00 35.00 5.22 2.54 0.00 0.00 37.50 5.22 2.54 0.00 0.00 40.00 5.22 2.54 0.00 0.00 42.50 5.22 2.54 0.00 0.00 45.00 5.22 2.54 0.00 0.00 47.50 5.22 2.54 0.00 0.00 50.00 5.22 2.54 0.00 0.00 52.50 5.22 2.54 0.00 0.00 55.00 5.22 2.54 0.00 0.00 57.50 5.22 2.54 0.00 0.00 60.00 5.22 2.54 0.00 0.00 62.50 5.22 2.54 0.00 0.00 65.00 5.22 2.54 0.00 0.00 67.50 5.22 2.54 0.00 0.00 70.00 5.22 2.54 0.00 0.00