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 49 Summary for Subcatchment E2-P: E2A PERVIOUS Runoff = 0.17 cfs @ 12.04 hrs, Volume= 1,048 cf, Depth= 5.99" 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 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 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 50 Subcatchment E2-P: E2A PERVIOUS Hydrograph 0.19 Runoff 0.18 0.17 cfs 0.17 NOAA 24-hr D 0.16 0.15 100-Year-2020 Rainfall=9.18" 0.14 P2=3.47" 0.13 Runoff Area=2,099 sf 0.12 0.11 Runoff Volume=1,048 cf Flow (cfs) 0.1 Runoff Depth=5.99" 0.09 Flow Length=129' 0.08 0.07 Slope=0.0600 '/' 0.06 Tc=6.2 min 0.05 CN=74 0.04 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 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 51 Summary for Subcatchment E2B-IMP: E2B IMPERVIOUS Runoff = 0.14 cfs @ 12.00 hrs, Volume= 895 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 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 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 52 Subcatchment E2B-IMP: E2B IMPERVIOUS Hydrograph 0.15 Runoff 0.14 0.14 cfs 0.13 NOAA 24-hr D 0.12 100-Year-2020 Rainfall=9.18" 0.11 P2=3.47" 0.1 Runoff Area=1,202 sf 0.09 Runoff Volume=895 cf Flow (cfs) 0.08 Runoff Depth=8.94" 0.07 Flow Length=188' 0.06 Tc=1.1 min 0.05 CN=98 0.04 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 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 53 Summary for Subcatchment E2B-P: E2B PERVIOUS Runoff = 0.11 cfs @ 12.04 hrs, Volume= 664 cf, Depth= 5.99" 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 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 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 54 Subcatchment E2B-P: E2B PERVIOUS Hydrograph 0.12 Runoff 0.115 0.11 cfs 0.11 0.105 NOAA 24-hr D 0.1 100-Year-2020 Rainfall=9.18" 0.095 0.09 P2=3.47" 0.085 0.08 Runoff Area=1,329 sf 0.075 0.07 Runoff Volume=664 cf Flow (cfs) 0.065 Runoff Depth=5.99" 0.06 0.055 Flow Length=188' 0.05 0.045 Tc=5.8 min 0.04 CN=74 0.035 0.03 0.025 0.02 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

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 55 Summary for Link 8L: EXISTING DISTURBED Inflow Area = 77,894 sf, 89.82% Impervious, Inflow Depth = 8.61" for 100-Year-2020 event Inflow = 8.52 cfs @ 12.01 hrs, Volume= 55,917 cf Primary = 8.52 cfs @ 12.01 hrs, Volume= 55,917 cf, Atten= 0%, Lag= 0.0 min Routed to Link E-DP 1 : EXIST DP 1 Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link 8L: EXISTING DISTURBED Hydrograph Inflow 8.52 cfs Primary 9 8.52 cfs Inflow Area=77,894 sf 8 7 6 Flow (cfs) 5 4 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 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 56 Summary for Link 9L: TOTAL EXISTING Inflow Area = 133,334 sf, 63.85% Impervious, Inflow Depth = 7.74" for 100-Year-2020 event Inflow = 12.60 cfs @ 12.03 hrs, Volume= 86,050 cf Primary = 12.60 cfs @ 12.03 hrs, Volume= 86,050 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link 9L: TOTAL EXISTING Hydrograph Inflow 14 12.60 cfs Primary 13 12.60 cfs Inflow Area=133,334 sf 12 11 10 9 Flow (cfs) 8 7 6 5 4 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 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 57 Summary for Link E-DP 1: EXIST DP 1 Inflow Area = 116,669 sf, 61.62% Impervious, Inflow Depth = 7.66" for 100-Year-2020 event Inflow = 10.83 cfs @ 12.04 hrs, Volume= 74,476 cf Primary = 10.83 cfs @ 12.04 hrs, Volume= 74,476 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 12 10.83 cfs Primary 11 10.83 cfs Inflow Area=116,669 sf 10 9 8 7 Flow (cfs) 6 5 4 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)