Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Runoff = 0.44 cfs @ 12.36 hrs, Volume= 3,559 cf, Depth= 1.10" Routed to Link E-DP 1 : EXIST DP 1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description * 708 98 Roof-offsite * 1,220 98 Impervious 2,721 71 Meadow, non-grazed, HSG C * 32,886 70 wooded 1,240 74 >75% Grass cover, Good, HSG C 38,775 72 Weighted Average 36,847 95.03% Pervious Area 1,928 4.97% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 11.3 100 0.0900 0.15 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 3.47" 0.6 123 0.5000 3.54 Shallow Concentrated Flow, SC Woodland Kv= 5.0 fps 1.7 445 0.0470 4.40 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 13.6 668 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 10 Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Hydrograph 0.48 Runoff 0.46 0.44 cfs 0.44 0.42 NOAA 24-hr D 0.4 0.38 2-Year-2020 Rainfall=3.47" 0.36 0.34 P2=3.47" 0.32 0.3 Runoff Area=38,775 sf Runoff Volume=3,559 cf Flow (cfs) 0.28 0.26 0.24 Runoff Depth=1.10" 0.22 0.2 Flow Length=668' 0.18 0.16 Tc=13.6 min 0.14 0.12 CN=72 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment E2-IMP: E2A IMPERVIOUS Runoff = 0.51 cfs @ 12.01 hrs, Volume= 3,246 cf, Depth= 3.24" Routed to Link E-DP 2 : EXIST DP 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 4,643 98 Roofs, HSG C 7,392 98 Paved parking, HSG C 12,035 98 Weighted Average 12,035 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 100 0.0550 2.15 Sheet Flow, Pavement Smooth surfaces n= 0.011 P2= 3.47" 1.2 335 0.0550 4.76 Shallow Concentrated Flow, shadow concentrate Paved Kv= 20.3 fps 2.0 435 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 12 Subcatchment E2-IMP: E2A IMPERVIOUS Hydrograph 0.55 Runoff 0.51 cfs 0.5 NOAA 24-hr D 0.45 2-Year-2020 Rainfall=3.47" 0.4 P2=3.47" Runoff Area=12,035 sf 0.35 Runoff Volume=3,246 cf Flow (cfs) 0.3 Runoff Depth=3.24" 0.25 Flow Length=435' 0.2 Slope=0.0550 '/' 0.15 Tc=2.0 min 0.1 CN=98 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment E2-P: E2A PERVIOUS Runoff = 0.03 cfs @ 12.08 hrs, Volume= 213 cf, Depth= 1.22" Routed to Link E-DP 2 : EXIST DP 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 2,099 74 >75% Grass cover, Good, HSG C 2,099 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.1 100 0.0600 0.27 Sheet Flow, sheet flow Grass: Short n= 0.150 P2= 3.47" 0.1 29 0.0600 3.94 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 6.2 129 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 14 Subcatchment E2-P: E2A PERVIOUS Hydrograph 0.036 Runoff 0.034 0.03 cfs 0.032 NOAA 24-hr D 0.03 0.028 2-Year-2020 Rainfall=3.47" 0.026 P2=3.47" 0.024 Runoff Area=2,099 sf 0.022 Runoff Volume=213 cf Flow (cfs) 0.02 0.018 Runoff Depth=1.22" 0.016 Flow Length=129' 0.014 0.012 Slope=0.0600 '/' 0.01 Tc=6.2 min 0.008 0.006 CN=74 0.004 0.002 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment E2B-IMP: E2B IMPERVIOUS Runoff = 0.05 cfs @ 12.00 hrs, Volume= 324 cf, Depth= 3.24" Routed to Link E-DP 2 : EXIST DP 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 1,202 98 Paved parking, HSG C 1,202 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 100 0.0900 2.61 Sheet Flow, sidewalk Smooth surfaces n= 0.011 P2= 3.47" 0.5 88 0.0250 3.21 Shallow Concentrated Flow, shadow concentrate Paved Kv= 20.3 fps 1.1 188 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 16 Subcatchment E2B-IMP: E2B IMPERVIOUS Hydrograph 0.055 Runoff 0.05 cfs 0.05 NOAA 24-hr D 0.045 2-Year-2020 Rainfall=3.47" 0.04 P2=3.47" 0.035 Runoff Area=1,202 sf Runoff Volume=324 cf Flow (cfs) 0.03 Runoff Depth=3.24" 0.025 Flow Length=188' 0.02 Tc=1.1 min 0.015 CN=98 0.01 0.005 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment E2B-P: E2B PERVIOUS Runoff = 0.02 cfs @ 12.08 hrs, Volume= 135 cf, Depth= 1.22" Routed to Link E-DP 2 : EXIST DP 2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Area (sf) CN Description 1,329 74 >75% Grass cover, Good, HSG C 1,329 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.2 100 0.0900 0.32 Sheet Flow, sheet flow Grass: Short n= 0.150 P2= 3.47" 0.6 88 0.0250 2.55 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 5.8 188 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 18 Subcatchment E2B-P: E2B PERVIOUS Hydrograph 0.023 Runoff 0.022 0.02 cfs 0.021 0.02 NOAA 24-hr D 0.019 0.018 2-Year-2020 Rainfall=3.47" 0.017 0.016 P2=3.47" 0.015 Runoff Area=1,329 sf 0.014 Runoff Volume=135 cf Flow (cfs) 0.013 0.012 0.011 Runoff Depth=1.22" 0.01 0.009 Flow Length=188' 0.008 0.007 Tc=5.8 min 0.006 0.005 CN=74 0.004 0.003 0.002 0.001 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)