Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

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 128 Subcatchment P3B-IMP: P3B IMPERVIOUS Hydrograph 0.15 Runoff 0.14 cfs 0.14 NOAA 24-hr D 0.13 100-Year-2050 Rainfall=11.52" 0.12 P2=4.09" 0.11 Runoff Area=980 sf 0.1 Runoff Volume=921 cf 0.09 Flow (cfs) Runoff Depth=11.28" 0.08 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-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 129 Summary for Subcatchment P3B-P: P3B PERVIOUS Runoff = 0.21 cfs @ 12.03 hrs, Volume= 1,280 cf, Depth= 8.17" 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 100-Year-2050 Rainfall=11.52", P2=4.09" Area (sf) CN Description 1,881 74 >75% Grass cover, Good, HSG C 1,881 100.00% 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 0.0230 2.44 Shallow Concentrated Flow, Lawn Unpaved Kv= 16.1 fps 5.3 188 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 130 Subcatchment P3B-P: P3B PERVIOUS Hydrograph 0.23 Runoff 0.22 0.21 cfs 0.21 NOAA 24-hr D 0.2 0.19 100-Year-2050 Rainfall=11.52" 0.18 P2=4.09" 0.17 0.16 Runoff Area=1,881 sf 0.15 0.14 Runoff Volume=1,280 cf Flow (cfs) 0.13 Runoff Depth=8.17" 0.12 0.11 Flow Length=188' 0.1 Tc=5.3 min 0.09 0.08 CN=74 0.07 0.06 0.05 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-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 131 Summary for Subcatchment P3C: P3C- Roof Area Runoff = 0.64 cfs @ 12.00 hrs, Volume= 4,230 cf, Depth=11.28" 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 100-Year-2050 Rainfall=11.52", 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 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 132 Subcatchment P3C: P3C- Roof Area Hydrograph 0.7 Runoff 0.64 cfs 0.65 NOAA 24-hr D 0.6 100-Year-2050 Rainfall=11.52" 0.55 P2=4.09" 0.5 Runoff Area=4,500 sf 0.45 Runoff Volume=4,230 cf Flow (cfs) 0.4 Runoff Depth=11.28" 0.35 Flow Length=106' 0.3 Tc=1.0 min 0.25 CN=98 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-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 133 Summary for Link 11L: Proposed Disturbed Inflow Area = 77,230 sf, 88.71% Impervious, Inflow Depth = 10.93" for 100-Year-2050 event Inflow = 10.56 cfs @ 12.01 hrs, Volume= 70,326 cf Primary = 10.56 cfs @ 12.01 hrs, Volume= 70,326 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 10.56 cfs Primary 11 10.56 cfs Inflow Area=77,230 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-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 134 Summary for Link 15L: TOTAL PROPOSED Inflow Area = 133,334 sf, 61.50% Impervious, Inflow Depth = 9.95" for 100-Year-2050 event Inflow = 16.11 cfs @ 12.03 hrs, Volume= 110,523 cf Primary = 16.11 cfs @ 12.03 hrs, Volume= 110,523 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 18 Primary 16.11 cfs 17 16 16.11 cfs Inflow Area=133,334 sf 15 14 13 12 11 Flow (cfs) 10 9 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-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 135 Summary for Link P-DP 1: PROP DP 1 Inflow Area = 116,005 sf, 62.48% Impervious, Inflow Depth = 9.96" for 100-Year-2050 event Inflow = 13.89 cfs @ 12.04 hrs, Volume= 96,261 cf Primary = 13.89 cfs @ 12.04 hrs, Volume= 96,261 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 13.89 cfs Primary 15 14 13.89 cfs Inflow Area=116,005 sf 13 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-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 136 Summary for Link P-DP 2: PROP DP 2 Inflow Area = 17,329 sf, 54.94% Impervious, Inflow Depth = 9.88" for 100-Year-2050 event Inflow = 2.22 cfs @ 12.02 hrs, Volume= 14,261 cf Primary = 2.22 cfs @ 12.02 hrs, Volume= 14,261 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 2.22 cfs Primary 2.22 cfs Inflow Area=17,329 sf 2 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)

APPENDIX C STORM SEWER CAPACITY CALCULATIONS 11