Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 100-Year-2020 Rainfall=9.18", 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 58 Summary for Link E-DP 2: EXIST DP 2 Inflow Area = 16,665 sf, 79.43% Impervious, Inflow Depth = 8.33" for 100-Year-2020 event Inflow = 1.77 cfs @ 12.01 hrs, Volume= 11,573 cf Primary = 1.77 cfs @ 12.01 hrs, Volume= 11,573 cf, Atten= 0%, Lag= 0.0 min Routed to Link 9L : TOTAL EXISTING Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link E-DP 2: EXIST DP 2 Hydrograph Inflow 1.77 cfs Primary 1.77 cfs Inflow Area=16,665 sf Flow (cfs) 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 2-Year-2050 Rainfall=4.09", 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 59 Summary for Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Runoff = 3.48 cfs @ 12.01 hrs, Volume= 22,476 cf, Depth= 3.85" 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 2-Year-2050 Rainfall=4.09", 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 2-Year-2050 Rainfall=4.09", 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 60 Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Hydrograph Runoff 3.48 cfs NOAA 24-hr D 3 2-Year-2050 Rainfall=4.09" P2=4.09" Runoff Area=69,966 sf Runoff Volume=22,476 cf Flow (cfs) 2 Runoff Depth=3.85" Flow Length=443' Tc=2.1 min 1 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 2-Year-2050 Rainfall=4.09", 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 61 Summary for Subcatchment E1B: E1B DISTURBED/PERVIOUS Runoff = 0.16 cfs @ 12.06 hrs, Volume= 1,007 cf, Depth= 1.52" 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 2-Year-2050 Rainfall=4.09", 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 2-Year-2050 Rainfall=4.09", 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 62 Subcatchment E1B: E1B DISTURBED/PERVIOUS Hydrograph 0.18 Runoff 0.17 0.16 cfs 0.16 NOAA 24-hr D 0.15 0.14 2-Year-2050 Rainfall=4.09" 0.13 P2=4.09" 0.12 Runoff Area=7,928 sf 0.11 Runoff Volume=1,007 cf Flow (cfs) 0.1 0.09 Runoff Depth=1.52" 0.08 0.07 Flow Length=464' 0.06 Tc=3.6 min 0.05 0.04 CN=72 0.03 0.02 0.01 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-2050 Rainfall=4.09", 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 63 Summary for Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Runoff = 0.61 cfs @ 12.27 hrs, Volume= 4,923 cf, Depth= 1.52" 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-2050 Rainfall=4.09", 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 2-Year-2050 Rainfall=4.09", 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 64 Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Hydrograph Runoff 0.65 0.61 cfs 0.6 NOAA 24-hr D 0.55 2-Year-2050 Rainfall=4.09" 0.5 P2=4.09" 0.45 Runoff Area=38,775 sf 0.4 Runoff Volume=4,923 cf Flow (cfs) 0.35 Runoff Depth=1.52" 0.3 0.25 Flow Length=668' 0.2 Tc=12.7 min 0.15 CN=72 0.1 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-2050 Rainfall=4.09", 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 65 Summary for Subcatchment E2-IMP: E2A IMPERVIOUS Runoff = 0.60 cfs @ 12.01 hrs, Volume= 3,866 cf, Depth= 3.85" 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-2050 Rainfall=4.09", 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 2-Year-2050 Rainfall=4.09", 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 66 Subcatchment E2-IMP: E2A IMPERVIOUS Hydrograph 0.65 Runoff 0.60 cfs 0.6 NOAA 24-hr D 0.55 2-Year-2050 Rainfall=4.09" 0.5 P2=4.09" 0.45 Runoff Area=12,035 sf 0.4 Runoff Volume=3,866 cf Flow (cfs) 0.35 Runoff Depth=3.85" 0.3 Flow Length=435' 0.25 Slope=0.0550 '/' 0.2 Tc=1.9 min 0.15 CN=98 0.1 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-2050 Rainfall=4.09", 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 67 Summary for Subcatchment E2-P: E2A PERVIOUS Runoff = 0.05 cfs @ 12.07 hrs, Volume= 291 cf, Depth= 1.66" 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-2050 Rainfall=4.09", 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