Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 77 Summary for Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Runoff = 5.45 cfs @ 12.01 hrs, Volume= 35,750 cf, Depth= 6.13" Routed to Link 8L : EXISTING DISTURBED 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 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description 69,966 98 Paved parking, HSG C 69,966 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.7 100 0.0650 2.49 Sheet Flow, Parking lot Smooth surfaces n= 0.011 P2= 4.09" 1.4 343 0.0420 4.16 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 2.1 443 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 78 Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Hydrograph 6 Runoff 5.45 cfs NOAA 24-hr D 5 10-Year-2050 Rainfall=6.37" P2=4.09" 4 Runoff Area=69,966 sf Runoff Volume=35,750 cf Flow (cfs) 3 Runoff Depth=6.13" Flow Length=443' 2 Tc=2.1 min CN=98 1 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 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 79 Summary for Subcatchment E1B: E1B DISTURBED/PERVIOUS Runoff = 0.37 cfs @ 12.04 hrs, Volume= 2,179 cf, Depth= 3.30" Routed to Link 8L : EXISTING DISTURBED 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 10-Year-2050 Rainfall=6.37", P2=4.09" Area (sf) CN Description 7,928 72 Woods/grass comb., Good, HSG C 7,928 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.7 25 0.5000 0.24 Sheet Flow, Wooded Woods: Light underbrush n= 0.400 P2= 4.09" 0.5 75 0.0800 2.56 Sheet Flow, Paved area Smooth surfaces n= 0.011 P2= 4.09" 1.4 364 0.0480 4.45 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 3.6 464 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 80 Subcatchment E1B: E1B DISTURBED/PERVIOUS Hydrograph 0.4 Runoff 0.37 cfs 0.38 0.36 NOAA 24-hr D 0.34 0.32 10-Year-2050 Rainfall=6.37" 0.3 P2=4.09" 0.28 0.26 Runoff Area=7,928 sf 0.24 Runoff Volume=2,179 cf Flow (cfs) 0.22 0.2 Runoff Depth=3.30" 0.18 Flow Length=464' 0.16 0.14 Tc=3.6 min 0.12 0.1 CN=72 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 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 81 Summary for Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Runoff = 1.42 cfs @ 12.19 hrs, Volume= 10,658 cf, Depth= 3.30" 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 10-Year-2050 Rainfall=6.37", P2=4.09" 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) 10.4 100 0.0900 0.16 Sheet Flow, sheet flow Woods: Light underbrush n= 0.400 P2= 4.09" 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 12.7 668 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 82 Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Hydrograph Runoff 1.42 cfs NOAA 24-hr D 10-Year-2050 Rainfall=6.37" P2=4.09" 1 Runoff Area=38,775 sf Runoff Volume=10,658 cf Flow (cfs) Runoff Depth=3.30" Flow Length=668' Tc=12.7 min CN=72 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 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 83 Summary for Subcatchment E2-IMP: E2A IMPERVIOUS Runoff = 0.94 cfs @ 12.01 hrs, Volume= 6,149 cf, Depth= 6.13" 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 10-Year-2050 Rainfall=6.37", P2=4.09" 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) 0.7 100 0.0550 2.33 Sheet Flow, Pavement Smooth surfaces n= 0.011 P2= 4.09" 1.2 335 0.0550 4.76 Shallow Concentrated Flow, shadow concentrate Paved Kv= 20.3 fps 1.9 435 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 84 Subcatchment E2-IMP: E2A IMPERVIOUS Hydrograph Runoff 1 0.94 cfs NOAA 24-hr D 10-Year-2050 Rainfall=6.37" P2=4.09" Runoff Area=12,035 sf Runoff Volume=6,149 cf Flow (cfs) Runoff Depth=6.13" Flow Length=435' Slope=0.0550 '/' Tc=1.9 min CN=98 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 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 85 Summary for Subcatchment E2-P: E2A PERVIOUS Runoff = 0.10 cfs @ 12.05 hrs, Volume= 612 cf, Depth= 3.50" 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 10-Year-2050 Rainfall=6.37", P2=4.09" 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) 5.6 100 0.0600 0.30 Sheet Flow, sheet flow Grass: Short n= 0.150 P2= 4.09" 0.1 29 0.0600 3.94 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 5.7 129 Total

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Jarmel Kizel Architects & Engnrs Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC Page 86 Subcatchment E2-P: E2A PERVIOUS Hydrograph 0.11 Runoff 0.105 0.10 cfs 0.1 NOAA 24-hr D 0.095 0.09 10-Year-2050 Rainfall=6.37" 0.085 0.08 P2=4.09" 0.075 0.07 Runoff Area=2,099 sf 0.065 Runoff Volume=612 cf Flow (cfs) 0.06 0.055 Runoff Depth=3.50" 0.05 0.045 Flow Length=129' 0.04 Slope=0.0600 '/' 0.035 0.03 Tc=5.7 min 0.025 0.02 CN=74 0.015 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