Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-PROPOSED-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 108 Subcatchment P3B-P: P3B PERVIOUS Hydrograph 0.1 Runoff 0.095 0.09 cfs 0.09 NOAA 24-hr D 0.085 0.08 10-Year-2050 Rainfall=6.37" 0.075 P2=4.09" 0.07 0.065 Runoff Area=1,881 sf 0.06 Runoff Volume=548 cf Flow (cfs) 0.055 0.05 Runoff Depth=3.50" 0.045 0.04 Flow Length=188' 0.035 Tc=5.3 min 0.03 0.025 CN=74 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 Time (hours)

24-223 DRAINAGE DESIGN-PROPOSED-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 109 Summary for Subcatchment P3C: P3C- Roof Area Runoff = 0.35 cfs @ 12.00 hrs, Volume= 2,299 cf, Depth= 6.13" Routed to Link P-DP 2 : PROP 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 * 4,500 98 Roof and Amenity Area 4,500 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 52 0.0100 1.03 Sheet Flow, ROOF Smooth surfaces n= 0.011 P2= 4.09" 0.2 54 0.0216 5.51 1.92 Pipe Channel, 8 ROOF DRAIN 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.012 1.0 106 Total

24-223 DRAINAGE DESIGN-PROPOSED-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 110 Subcatchment P3C: P3C- Roof Area Hydrograph 0.38 Runoff 0.35 cfs 0.36 0.34 NOAA 24-hr D 0.32 10-Year-2050 Rainfall=6.37" 0.3 0.28 P2=4.09" 0.26 Runoff Area=4,500 sf 0.24 Runoff Volume=2,299 cf Flow (cfs) 0.22 0.2 Runoff Depth=6.13" 0.18 0.16 Flow Length=106' 0.14 Tc=1.0 min 0.12 0.1 CN=98 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-PROPOSED-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 111 Summary for Link 11L: Proposed Disturbed Inflow Area = 77,230 sf, 88.71% Impervious, Inflow Depth = 5.83" for 10-Year-2050 event Inflow = 5.71 cfs @ 12.01 hrs, Volume= 37,548 cf Primary = 5.71 cfs @ 12.01 hrs, Volume= 37,548 cf, Atten= 0%, Lag= 0.0 min Routed to Link P-DP 1 : PROP DP 1 Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link 11L: Proposed Disturbed Hydrograph Inflow 5.71 cfs Primary 6 5.71 cfs Inflow Area=77,230 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-PROPOSED-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 112 Summary for Link 15L: TOTAL PROPOSED Inflow Area = 133,334 sf, 61.50% Impervious, Inflow Depth = 5.01" for 10-Year-2050 event Inflow = 8.20 cfs @ 12.03 hrs, Volume= 55,669 cf Primary = 8.20 cfs @ 12.03 hrs, Volume= 55,669 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link 15L: TOTAL PROPOSED Hydrograph Inflow 9 8.20 cfs Primary 8 8.20 cfs Inflow Area=133,334 sf 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-PROPOSED-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 113 Summary for Link P-DP 1: PROP DP 1 Inflow Area = 116,005 sf, 62.48% Impervious, Inflow Depth = 5.02" for 10-Year-2050 event Inflow = 7.08 cfs @ 12.04 hrs, Volume= 48,528 cf Primary = 7.08 cfs @ 12.04 hrs, Volume= 48,528 cf, Atten= 0%, Lag= 0.0 min Routed to Link 15L : TOTAL PROPOSED Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link P-DP 1: PROP DP 1 Hydrograph Inflow 7.08 cfs Primary 7 7.08 cfs Inflow Area=116,005 sf 6 5 Flow (cfs) 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-PROPOSED-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 114 Summary for Link P-DP 2: PROP DP 2 Inflow Area = 17,329 sf, 54.94% Impervious, Inflow Depth = 4.94" for 10-Year-2050 event Inflow = 1.12 cfs @ 12.02 hrs, Volume= 7,141 cf Primary = 1.12 cfs @ 12.02 hrs, Volume= 7,141 cf, Atten= 0%, Lag= 0.0 min Routed to Link 15L : TOTAL PROPOSED Primary outflow = Inflow, Time Span= 0.00-36.00 hrs, dt= 0.50 hrs Link P-DP 2: PROP DP 2 Hydrograph Inflow 1.12 cfs Primary 1.12 cfs Inflow Area=17,329 sf 1 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-PROPOSED-UPDATE NOAA 24-hr D 100-Year-2050 Rainfall=11.52", 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 115 Summary for Subcatchment 1S: Roof Runoff = 6.87 cfs @ 12.00 hrs, Volume= 45,619 cf, Depth=11.28" Routed to Link 11L : Proposed 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-2050 Rainfall=11.52", P2=4.09" Area (sf) CN Description * 48,537 98 Roof and Amenity Area 48,537 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.6 53 0.0200 1.37 Sheet Flow, ROOF Smooth surfaces n= 0.011 P2= 4.09" 0.5 196 0.0200 6.95 5.46 Pipe Channel, 12 ROOF DRAIN 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 0.3 217 0.0424 11.74 14.41 Pipe Channel, 15 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 1.4 466 Total

24-223 DRAINAGE DESIGN-PROPOSED-UPDATE NOAA 24-hr D 100-Year-2050 Rainfall=11.52", 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 116 Subcatchment 1S: Roof Hydrograph Runoff 6.87 cfs 7 NOAA 24-hr D 100-Year-2050 Rainfall=11.52" 6 P2=4.09" 5 Runoff Area=48,537 sf Runoff Volume=45,619 cf Flow (cfs) 4 Runoff Depth=11.28" Flow Length=466' 3 Tc=1.4 min 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-PROPOSED-UPDATE NOAA 24-hr D 100-Year-2050 Rainfall=11.52", 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 117 Summary for Subcatchment P1-I: P1 IMPERVIOUS PARKING Runoff = 2.82 cfs @ 12.01 hrs, Volume= 18,775 cf, Depth=11.28" Routed to Link 11L : Proposed 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-2050 Rainfall=11.52", P2=4.09" Area (sf) CN Description * 19,976 98 Uncovered Paved parking, HSG C 19,976 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0150 1.21 Sheet Flow, sheet flow Parking area n= 0.013 P2= 4.09" 0.9 127 0.0150 2.49 Shallow Concentrated Flow, parking area Paved Kv= 20.3 fps 0.3 198 0.0449 12.08 14.83 Pipe Channel, Pipe flow 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 2.6 425 Total