Drainage Report

043 529.00 5,043 4,240 531.55 9,384 22,510 529.05 5,123 4,494 531.60 9,472 22,981 529.10 5,203 4,752 531.65 9,560 23,457 529.15 5,283 5,014 531.70 9,649 23,937 529.20 5,364 5,280 531.75 9,737 24,422 529.25 5,444 5,551 531.80 9,825 24,911 529.30 5,524 5,825 531.85 9,913 25,404 529.35 5,604 6,103 531.90 10,001 25,902 529.40 5,685 6,385 531.95 10,090 26,404 529.45 5,765 6,671 532.00 10,178 26,911 529.50 5,845 6,962 529.55 5,926 7,256 529.60 6,006 7,554 529.65 6,086 7,857 529.70 6,166 8,163 529.75 6,247 8,473 529.80 6,327 8,788 529.85 6,407 9,106 529.90 6,487 9,428 529.95 6,568 9,755 530.00 6,648 10,085 530.05 6,736 10,420 530.10 6,825 10,759 530.15 6,913 11,102 530.20 7,001 11,450 530.25 7,089 11,802 530.30 7,177 12,159 530.35 7,266 12,520 530.40 7,354 12,885 530.45 7,442 13,255 530.50 7,531 13,630

Basin 3 without exfiltration proposed basin 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 20 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 34S: Basin 3 Runoff Area=95,425 sf Runoff Depth=3.37" Flow Length=670' Tc=10.0 min CN=74/98 Runoff=6.79 cfs 0.615 af Subcatchment 36S: Basin 3 undetained Runoff Area=18,573 sf Runoff Depth=3.43" Flow Length=45' Slope=0.1000 '/' Tc=10.0 min CN=74/98 Runoff=1.34 cfs 0.122 af Subcatchment 37S: Basin 3 pre-development Runoff Area=113,998 sf Runoff Depth=2.20" Flow Length=304' Tc=19.4 min CN=70/0 Runoff=4.35 cfs 0.480 af Pond 35P: Basin 3 Peak Elev=530.77' Storage=15,712 cf Inflow=6.79 cfs 0.615 af Outflow=0.87 cfs 0.352 af Total Runoff Area = 5.234 ac Runoff Volume = 1.217 af Average Runoff Depth = 2.79"

Basin 3 without exfiltration proposed basin 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 21 Summary for Subcatchment 34S: Basin 3 [47] Hint: Peak is 136% of capacity of segment #4 Runoff = 6.79 cfs @ 12.17 hrs, Volume= 0.615 af, Depth= 3.37" Routed to Pond 35P : Basin 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 10-Year Rainfall=5.22" Area (sf) CN Description 32,412 98 Paved parking, HSG C 63,013 74 >75% Grass cover, Good, HSG C 95,425 82 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.9 100 0.0800 0.21 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 0.1 20 0.0800 4.24 Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 0.4 100 0.0500 4.54 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.8 450 0.0600 8.91 5.00 Pipe Channel, 15.0" Round w/ 8.0" inside fill Area= 0.6 sf Perim= 3.1' r= 0.18' n= 0.013 Concrete sewer w/manholes & inlets 9.2 670 Total, Increased to minimum Tc = 10.0 min

Basin 3 without exfiltration proposed basin 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 22 Subcatchment 34S: Basin 3 Hydrograph Runoff 7 6.79 cfs NOAA 24-hr D 6 10-Year Rainfall=5.22" Runoff Area=95,425 sf 5 Runoff Volume=0.615 af Flow (cfs) 4 Runoff Depth=3.37" Flow Length=670' 3 Tc=10.0 min 2 CN=74/98 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 3 without exfiltration proposed basin 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 23 Hydrograph for Subcatchment 34S: Basin 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 0.16 0.00 0.04 0.03 5.00 0.36 0.00 0.19 0.05 7.50 0.61 0.00 0.42 0.09 10.00 1.03 0.03 0.82 0.22 12.50 3.57 1.29 3.33 1.95 15.00 4.39 1.89 4.16 0.33 17.50 4.73 2.15 4.49 0.20 20.00 4.95 2.32 4.71 0.15 22.50 5.13 2.47 4.89 0.13 25.00 5.22 2.54 4.98 0.00 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 3 without exfiltration proposed basin 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 24 Summary for Subcatchment 36S: Basin 3 undetained Runoff = 1.34 cfs @ 12.17 hrs, Volume= 0.122 af, Depth= 3.43" 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 11,836 74 >75% Grass cover, Good, HSG C 6,737 98 Paved roads w/curbs & sewers, HSG C 18,573 83 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 45 0.1000 0.20 Sheet Flow, Grass: Dense n= 0.240 P2= 3.44" 3.8 45 Total, Increased to minimum Tc = 10.0 min Subcatchment 36S: Basin 3 undetained Hydrograph Runoff 1.34 cfs NOAA 24-hr D 10-Year Rainfall=5.22" 1 Runoff Area=18,573 sf Runoff Volume=0.122 af Flow (cfs) Runoff Depth=3.43"

Runoff Volume=0.122 af Flow (cfs) Runoff Depth=3.43" Flow Length=45' Slope=0.1000 '/' Tc=10.0 min CN=74/98 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 3 without exfiltration proposed basin 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 25 Hydrograph for Subcatchment 36S: Basin 3 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 0.04 0.01 5.00 0.36 0.00 0.19 0.01 7.50 0.61 0.00 0.42 0.02 10.00 1.03 0.03 0.82 0.05 12.50 3.57 1.29 3.33 0.38 15.00 4.39 1.89 4.16 0.06 17.50 4.73 2.15 4.49 0.04 20.00 4.95 2.32 4.71 0.03 22.50 5.13 2.47 4.89 0.02 25.00 5.22 2.54 4.98 0.00 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 3 without exfiltration proposed basin 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 26 Summary for Subcatchment 37S: Basin 3 pre-development Runoff = 4.35 cfs @ 12.29 hrs, Volume= 0.480 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 113,998 70 Woods, Good, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.7 100 0.0400 0.11 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 3.44" 3.7 204 0.0340 0.92 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 19.4 304 Total Subcatchment 37S: Basin 3 pre-development Hydrograph Runoff 4.35 cfs NOAA 24-hr D 4 10-Year Rainfall=5.22" Runoff Area=113,998 sf 3 Runoff Volume=0.480 af Flow (cfs) Runoff Depth=2.20" 2

80 af Flow (cfs) Runoff Depth=2.20" 2 Flow Length=304' Tc=19.4 min CN=70/0 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)