Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

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 68 Subcatchment E2-P: E2A PERVIOUS Hydrograph 0.05 Runoff 0.048 0.05 cfs 0.046 0.044 NOAA 24-hr D 0.042 0.04 2-Year-2050 Rainfall=4.09" 0.038 0.036 P2=4.09" 0.034 0.032 Runoff Area=2,099 sf 0.03 Runoff Volume=291 cf Flow (cfs) 0.028 0.026 Runoff Depth=1.66" 0.024 0.022 Flow Length=129' 0.02 0.018 Slope=0.0600 '/' 0.016 0.014 Tc=5.7 min 0.012 0.01 CN=74 0.008 0.006 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

0.008 0.006 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-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 69 Summary for Subcatchment E2B-IMP: E2B IMPERVIOUS Runoff = 0.06 cfs @ 12.00 hrs, Volume= 386 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 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 2.84 Sheet Flow, sidewalk Smooth surfaces n= 0.011 P2= 4.09" 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-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 70 Subcatchment E2B-IMP: E2B IMPERVIOUS Hydrograph 0.065 Runoff 0.06 cfs 0.06 NOAA 24-hr D 0.055 2-Year-2050 Rainfall=4.09" 0.05 P2=4.09" 0.045 Runoff Area=1,202 sf 0.04 Runoff Volume=386 cf Flow (cfs) 0.035 0.03 Runoff Depth=3.85" 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-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 71 Summary for Subcatchment E2B-P: E2B PERVIOUS Runoff = 0.03 cfs @ 12.06 hrs, Volume= 184 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 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) 4.7 100 0.0900 0.35 Sheet Flow, sheet flow Grass: Short n= 0.150 P2= 4.09" 0.6 88 0.0250 2.55 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 5.3 188 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 72 Subcatchment E2B-P: E2B PERVIOUS Hydrograph 0.032 Runoff 0.03 cfs 0.03 0.028 NOAA 24-hr D 0.026 2-Year-2050 Rainfall=4.09" 0.024 P2=4.09" 0.022 0.02 Runoff Area=1,329 sf Runoff Volume=184 cf Flow (cfs) 0.018 0.016 Runoff Depth=1.66" 0.014 Flow Length=188' 0.012 0.01 Tc=5.3 min 0.008 CN=74 0.006 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-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 73 Summary for Link 8L: EXISTING DISTURBED Inflow Area = 77,894 sf, 89.82% Impervious, Inflow Depth = 3.62" for 2-Year-2050 event Inflow = 3.64 cfs @ 12.01 hrs, Volume= 23,482 cf Primary = 3.64 cfs @ 12.01 hrs, Volume= 23,482 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 4 3.64 cfs Primary 3.64 cfs Inflow Area=77,894 sf 3 Flow (cfs) 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 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 74 Summary for Link 9L: TOTAL EXISTING Inflow Area = 133,334 sf, 63.85% Impervious, Inflow Depth = 2.98" for 2-Year-2050 event Inflow = 4.95 cfs @ 12.03 hrs, Volume= 33,132 cf Primary = 4.95 cfs @ 12.03 hrs, Volume= 33,132 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 4.95 cfs Primary 5 4.95 cfs Inflow Area=133,334 sf 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 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 75 Summary for Link E-DP 1: EXIST DP 1 Inflow Area = 116,669 sf, 61.62% Impervious, Inflow Depth = 2.92" for 2-Year-2050 event Inflow = 4.21 cfs @ 12.03 hrs, Volume= 28,405 cf Primary = 4.21 cfs @ 12.03 hrs, Volume= 28,405 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 4.21 cfs Primary 4.21 cfs Inflow Area=116,669 sf 4 3 Flow (cfs) 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 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 76 Summary for Link E-DP 2: EXIST DP 2 Inflow Area = 16,665 sf, 79.43% Impervious, Inflow Depth = 3.40" for 2-Year-2050 event Inflow = 0.73 cfs @ 12.01 hrs, Volume= 4,727 cf Primary = 0.73 cfs @ 12.01 hrs, Volume= 4,727 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 0.8 0.73 cfs Primary 0.75 0.73 cfs Inflow Area=16,665 sf 0.7 0.65 0.6 0.55 0.5 Flow (cfs) 0.45 0.4 0.35 0.3 0.25 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)