Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

24-223 DRAINAGE DESIGN-EXISTING-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 105 Summary for Subcatchment E2B-IMP: E2B IMPERVIOUS Runoff = 0.17 cfs @ 12.00 hrs, Volume= 1,130 cf, Depth=11.28" 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-2050 Rainfall=11.52", 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 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 106 Subcatchment E2B-IMP: E2B IMPERVIOUS Hydrograph 0.19 Runoff 0.18 0.17 cfs 0.17 NOAA 24-hr D 0.16 0.15 100-Year-2050 Rainfall=11.52" 0.14 P2=4.09" 0.13 Runoff Area=1,202 sf 0.12 Runoff Volume=1,130 cf 0.11 Flow (cfs) 0.1 Runoff Depth=11.28" 0.09 Flow Length=188' 0.08 Tc=1.1 min 0.07 CN=98 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-EXISTING-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 107 Summary for Subcatchment E2B-P: E2B PERVIOUS Runoff = 0.15 cfs @ 12.03 hrs, Volume= 904 cf, Depth= 8.17" 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-2050 Rainfall=11.52", 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 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 108 Subcatchment E2B-P: E2B PERVIOUS Hydrograph Runoff 0.16 0.15 cfs 0.15 NOAA 24-hr D 0.14 100-Year-2050 Rainfall=11.52" 0.13 P2=4.09" 0.12 0.11 Runoff Area=1,329 sf 0.1 Runoff Volume=904 cf Flow (cfs) 0.09 Runoff Depth=8.17" 0.08 Flow Length=188' 0.07 Tc=5.3 min 0.06 CN=74 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-EXISTING-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 109 Summary for Link 8L: EXISTING DISTURBED Inflow Area = 77,894 sf, 89.82% Impervious, Inflow Depth = 10.93" for 100-Year-2050 event Inflow = 10.77 cfs @ 12.01 hrs, Volume= 70,971 cf Primary = 10.77 cfs @ 12.01 hrs, Volume= 70,971 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 12 10.77 cfs Primary 11 10.77 cfs Inflow Area=77,894 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-EXISTING-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 110 Summary for Link 9L: TOTAL EXISTING Inflow Area = 133,334 sf, 63.85% Impervious, Inflow Depth = 10.01" for 100-Year-2050 event Inflow = 16.35 cfs @ 12.03 hrs, Volume= 111,230 cf Primary = 16.35 cfs @ 12.03 hrs, Volume= 111,230 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 18 16.35 cfs Primary 17 16 16.35 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-EXISTING-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 111 Summary for Link E-DP 1: EXIST DP 1 Inflow Area = 116,669 sf, 61.62% Impervious, Inflow Depth = 9.92" for 100-Year-2050 event Inflow = 14.10 cfs @ 12.03 hrs, Volume= 96,456 cf Primary = 14.10 cfs @ 12.03 hrs, Volume= 96,456 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 14.10 cfs Primary 15 14 14.10 cfs Inflow Area=116,669 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-EXISTING-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 112 Summary for Link E-DP 2: EXIST DP 2 Inflow Area = 16,665 sf, 79.43% Impervious, Inflow Depth = 10.64" for 100-Year-2050 event Inflow = 2.26 cfs @ 12.01 hrs, Volume= 14,774 cf Primary = 2.26 cfs @ 12.01 hrs, Volume= 14,774 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 2.26 cfs Primary 2.26 cfs Inflow Area=16,665 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 B PROPOSED DRAINAGE CALCULATIONS

P1-I P1-P P1 PERVIOUS P1 IMPERVIOUS P2 PARKING P-2 Pervious-w-offsite-Undisturbed P3A-P 1S P3A PERVIOUS 11L Roof Proposed Disturbed P3A-IMP P3A IMPERVIOUS P-DP 2 P3B-IMP P-DP 1 PROP DP 2 P3B IMPERVIOUS PROP DP 1 P3B-P P3B PERVIOUS 15L P3C TOTAL PROPOSED P3C- Roof Area Routing Diagram for 24-223 DRAINAGE DESIGN-PROPOSED-UPDATE Subcat Reach Pond Link Prepared by Jarmel Kizel Architects & Engnrs, Printed 1/28/2026 HydroCAD® 10.20-6a s/n 12607 © 2024 HydroCAD Software Solutions LLC