Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-UPDATE NOAA 24-hr D 10-Year-2020 Rainfall=5.38", 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 39 Summary for Link E-DP 1: EXIST DP 1 Inflow Area = 116,669 sf, 61.62% Impervious, Inflow Depth = 4.08" for 10-Year-2020 event Inflow = 5.82 cfs @ 12.03 hrs, Volume= 39,692 cf Primary = 5.82 cfs @ 12.03 hrs, Volume= 39,692 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 1: EXIST DP 1 Hydrograph Inflow 5.82 cfs Primary 6 5.82 cfs Inflow Area=116,669 sf 5 4 Flow (cfs) 3 2 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-2020 Rainfall=5.38", 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 40 Summary for Link E-DP 2: EXIST DP 2 Inflow Area = 16,665 sf, 79.43% Impervious, Inflow Depth = 4.63" for 10-Year-2020 event Inflow = 0.99 cfs @ 12.01 hrs, Volume= 6,436 cf Primary = 0.99 cfs @ 12.01 hrs, Volume= 6,436 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 0.99 cfs Primary 1 0.99 cfs Inflow Area=16,665 sf Flow (cfs) 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 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 41 Summary for Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Runoff = 7.87 cfs @ 12.01 hrs, Volume= 52,122 cf, Depth= 8.94" 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 100-Year-2020 Rainfall=9.18", P2=3.47" 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 2.30 Sheet Flow, Parking lot Smooth surfaces n= 0.011 P2= 3.47" 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 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 42 Subcatchment E1A: E1A DISTURBED/IMPERVIOUS Hydrograph Runoff 7.87 cfs 8 NOAA 24-hr D 7 100-Year-2020 Rainfall=9.18" P2=3.47" 6 Runoff Area=69,966 sf Runoff Volume=52,122 cf 5 Flow (cfs) Runoff Depth=8.94" 4 Flow Length=443' Tc=2.1 min 3 CN=98 2 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 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 43 Summary for Subcatchment E1B: E1B DISTURBED/PERVIOUS Runoff = 0.65 cfs @ 12.03 hrs, Volume= 3,795 cf, Depth= 5.74" 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 100-Year-2020 Rainfall=9.18", P2=3.47" 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) 1.9 25 0.5000 0.22 Sheet Flow, Wooded Woods: Light underbrush n= 0.400 P2= 3.47" 0.5 75 0.0800 2.35 Sheet Flow, Paved area Smooth surfaces n= 0.011 P2= 3.47" 1.4 364 0.0480 4.45 Shallow Concentrated Flow, Parking lot Paved Kv= 20.3 fps 3.8 464 Total

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 44 Subcatchment E1B: E1B DISTURBED/PERVIOUS Hydrograph 0.7 Runoff 0.65 cfs 0.65 NOAA 24-hr D 0.6 100-Year-2020 Rainfall=9.18" 0.55 P2=3.47" 0.5 Runoff Area=7,928 sf 0.45 Runoff Volume=3,795 cf Flow (cfs) 0.4 Runoff Depth=5.74" 0.35 Flow Length=464' 0.3 Tc=3.8 min 0.25 CN=72 0.2 0.15 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 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 45 Summary for Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Runoff = 2.44 cfs @ 12.20 hrs, Volume= 18,560 cf, Depth= 5.74" 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 100-Year-2020 Rainfall=9.18", 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 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 46 Subcatchment E1C: E1C Pervious-w-offsite-Undisturbed Hydrograph Runoff 2.44 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" 2 P2=3.47" Runoff Area=38,775 sf Runoff Volume=18,560 cf Flow (cfs) Runoff Depth=5.74" Flow Length=668' 1 Tc=13.6 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 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 47 Summary for Subcatchment E2-IMP: E2A IMPERVIOUS Runoff = 1.35 cfs @ 12.01 hrs, Volume= 8,966 cf, Depth= 8.94" 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 100-Year-2020 Rainfall=9.18", 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 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 48 Subcatchment E2-IMP: E2A IMPERVIOUS Hydrograph Runoff 1.35 cfs NOAA 24-hr D 100-Year-2020 Rainfall=9.18" P2=3.47" 1 Runoff Area=12,035 sf Runoff Volume=8,966 cf Flow (cfs) Runoff Depth=8.94" Flow Length=435' Slope=0.0550 '/' Tc=2.0 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)