Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-PROPOSED-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 69 Summary for Link P-DP 1: PROP DP 1 Inflow Area = 116,005 sf, 62.48% Impervious, Inflow Depth = 7.69" for 100-Year-2020 event Inflow = 10.67 cfs @ 12.04 hrs, Volume= 74,356 cf Primary = 10.67 cfs @ 12.04 hrs, Volume= 74,356 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 10.67 cfs Primary 11 10.67 cfs Inflow Area=116,005 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)

24-223 DRAINAGE DESIGN-PROPOSED-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 70 Summary for Link P-DP 2: PROP DP 2 Inflow Area = 17,329 sf, 54.94% Impervious, Inflow Depth = 7.61" for 100-Year-2020 event Inflow = 1.71 cfs @ 12.02 hrs, Volume= 10,992 cf Primary = 1.71 cfs @ 12.02 hrs, Volume= 10,992 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 1.71 cfs Primary 1.71 cfs Inflow Area=17,329 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-PROPOSED-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 1S: Roof Runoff = 2.42 cfs @ 12.01 hrs, Volume= 15,592 cf, Depth= 3.85" 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 2-Year-2050 Rainfall=4.09", 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 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 1S: Roof Hydrograph Runoff 2.42 cfs NOAA 24-hr D 2-Year-2050 Rainfall=4.09" 2 P2=4.09" Runoff Area=48,537 sf Runoff Volume=15,592 cf Flow (cfs) Runoff Depth=3.85" 1 Flow Length=466' Tc=1.4 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)

24-223 DRAINAGE DESIGN-PROPOSED-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 Subcatchment P1-I: P1 IMPERVIOUS PARKING Runoff = 0.99 cfs @ 12.01 hrs, Volume= 6,417 cf, Depth= 3.85" 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 2-Year-2050 Rainfall=4.09", 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

24-223 DRAINAGE DESIGN-PROPOSED-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 Subcatchment P1-I: P1 IMPERVIOUS PARKING Hydrograph Runoff 0.99 cfs 1 NOAA 24-hr D 2-Year-2050 Rainfall=4.09" P2=4.09" Runoff Area=19,976 sf Runoff Volume=6,417 cf Flow (cfs) Runoff Depth=3.85" Flow Length=425' Tc=2.6 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)

24-223 DRAINAGE DESIGN-PROPOSED-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 Subcatchment P1-P: P1 PERVIOUS Runoff = 0.17 cfs @ 12.13 hrs, Volume= 1,208 cf, Depth= 1.66" 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 2-Year-2050 Rainfall=4.09", P2=4.09" Area (sf) CN Description 8,717 74 >75% Grass cover, Good, HSG C 8,717 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.3 100 0.0430 0.18 Sheet Flow, Grass: Dense n= 0.240 P2= 4.09" 0.1 44 0.0470 12.36 15.17 Pipe Channel, Yard Inlet 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 0.2 325 0.0450 31.77 898.40 Pipe Channel, 72" Culvert 72.0" Round Area= 28.3 sf Perim= 18.8' r= 1.50' n= 0.013 9.6 469 Total

24-223 DRAINAGE DESIGN-PROPOSED-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 Subcatchment P1-P: P1 PERVIOUS Hydrograph 0.19 Runoff 0.18 0.17 cfs 0.17 NOAA 24-hr D 0.16 0.15 2-Year-2050 Rainfall=4.09" 0.14 P2=4.09" 0.13 0.12 Runoff Area=8,717 sf 0.11 Runoff Volume=1,208 cf Flow (cfs) 0.1 0.09 Runoff Depth=1.66" 0.08 0.07 Flow Length=469' 0.06 Tc=9.6 min 0.05 0.04 CN=74 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-PROPOSED-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 77 Summary for Subcatchment P2: P-2 Pervious-w-offsite-Undisturbed Runoff = 0.64 cfs @ 12.28 hrs, Volume= 5,145 cf, Depth= 1.59" Routed to Link P-DP 1 : PROP 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 * 2,744 98 Roof-offsite * 1,220 98 Impervious 1,506 71 Meadow, non-grazed, HSG C * 32,065 70 wooded * 1,240 74 >75% Grass offsite 38,775 73 Weighted Average 34,811 89.78% Pervious Area 3,964 10.22% 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" 1.8 110 0.0400 1.00 Shallow Concentrated Flow, SC Woodland Kv= 5.0 fps 0.6 115 0.0430 3.34 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 0.1 44 0.0500 12.75 15.65 Pipe Channel, Yard drains 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 0.2 325 0.0440 31.42 888.36 Pipe Channel, Culvert 72.0" Round Area= 28.3 sf Perim= 18.8' r= 1.50' n= 0.013 13.1 694 Total

24-223 DRAINAGE DESIGN-PROPOSED-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 78 Subcatchment P2: P-2 Pervious-w-offsite-Undisturbed Hydrograph 0.7 Runoff 0.64 cfs 0.65 NOAA 24-hr D 0.6 0.55 2-Year-2050 Rainfall=4.09" 0.5 P2=4.09" 0.45 Runoff Area=38,775 sf Runoff Volume=5,145 cf Flow (cfs) 0.4 0.35 Runoff Depth=1.59" 0.3 Flow Length=694' 0.25 Tc=13.1 min 0.2 0.15 CN=73 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)