Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - NOAA 24-hr D 100-Year-Projected Rainfall=11.52", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Link 1L: POI #1 Inflow Area = 0.637 ac, 62.17% Impervious, Inflow Depth = 9.40" for 100-Year-Projected event Inflow = 6.64 cfs @ 12.10 hrs, Volume= 0.499 af Primary = 6.64 cfs @ 12.10 hrs, Volume= 0.499 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Link 1L: POI #1 Hydrograph Inflow 6.64 cfs Primary 7 6.64 cfs Inflow Area=0.637 ac 6 5 Flow (cfs) 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

PROPOSED 3S 6S Proposed Roof PDA #1 - Impervious to Bio 1P 2P 7S UG BASIN BIO BASIN PDA #1 - Pervious to Bio 2L POI #1 5S 4S PDA #1 - Undetained Pervious PDA #1 - Undetained Impervious Subcat Reach Pond Link Routing Diagram for 2026-02 Proposed Conditions - AJH Prepared by Dynamic Engineering, Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 3S: Proposed Roof Runoff = 0.52 cfs @ 12.10 hrs, Volume= 0.038 af, Depth= 3.24" Routed to Pond 1P : UG BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Area (sf) CN Description 6,205 98 Roofs, HSG B 6,205 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 3S: Proposed Roof Hydrograph Runoff 0.55 0.52 cfs 0.5 NOAA 24-hr D 0.45 2-Year-Current Rainfall=3.47" P2=3.47" 0.4 Runoff Area=6,205 sf 0.35 Runoff Volume=0.038 af Flow (cfs) 0.3 Runoff Depth=3.24" 0.25 Tc=1.0 min

24" 0.25 Tc=1.0 min CN=98 0.2 0.15 0.1 0.05 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 4S: PDA #1 - Undetained Impervious Runoff = 0.74 cfs @ 12.10 hrs, Volume= 0.055 af, Depth= 3.24" Routed to Link 2L : POI #1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Area (sf) CN Description 8,866 98 Paved parking, HSG D 8,866 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.1 93 0.0188 1.38 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 1.0 326 0.0115 5.64 6.93 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 2.1 419 Total Subcatchment 4S: PDA #1 - Undetained Impervious Hydrograph 0.8 Runoff 0.74 cfs 0.75 0.7 NOAA 24-hr D 0.65 2-Year-Current Rainfall=3.47" 0.6 P2=3.47" 0.55 Runoff Area=8,866 sf 0.5 Runoff Volume=0.055 af Flow (cfs) 0.45

Runoff Area=8,866 sf 0.5 Runoff Volume=0.055 af Flow (cfs) 0.45 Runoff Depth=3.24" 0.4 Flow Length=419' 0.35 0.3 Tc=2.1 min 0.25 CN=98 0.2 0.15 0.1 0.05 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 4 Summary for Subcatchment 5S: PDA #1 - Undetained Pervious Runoff = 0.30 cfs @ 12.13 hrs, Volume= 0.020 af, Depth= 1.61" Routed to Link 2L : POI #1 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Area (sf) CN Description 6,562 80 >75% Grass cover, Good, HSG D 6,562 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.8 20 0.0200 0.09 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" 0.5 35 0.0200 1.16 Sheet Flow, B-C Smooth surfaces n= 0.011 P2= 3.47" 1.0 326 0.0115 5.64 6.93 Pipe Channel, C-D 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 5.3 381 Total Subcatchment 5S: PDA #1 - Undetained Pervious Hydrograph 0.32 Runoff 0.30 cfs 0.3 NOAA 24-hr D 0.28 0.26 2-Year-Current Rainfall=3.47" 0.24 P2=3.47" 0.22 Runoff Area=6,562 sf

P2=3.47" 0.22 Runoff Area=6,562 sf 0.2 Runoff Volume=0.020 af Flow (cfs) 0.18 Runoff Depth=1.61" 0.16 Flow Length=381' 0.14 0.12 Tc=5.3 min 0.1 CN=80 0.08 0.06 0.04 0.02 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

2026-02 Proposed Conditions - AJH NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 5 Summary for Subcatchment 6S: PDA #1 - Impervious to Bio Runoff = 0.33 cfs @ 12.10 hrs, Volume= 0.024 af, Depth= 3.24" Routed to Pond 2P : BIO BASIN Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" Area (sf) CN Description 3,921 98 Paved parking, HSG B 3,921 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.5 42 0.0326 1.46 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps 0.6 60 Total Subcatchment 6S: PDA #1 - Impervious to Bio Hydrograph 0.36 Runoff 0.34 0.33 cfs 0.32 NOAA 24-hr D 0.3 2-Year-Current Rainfall=3.47" 0.28 0.26 P2=3.47" 0.24 Runoff Area=3,921 sf 0.22 Runoff Volume=0.024 af Flow (cfs) 0.2

Runoff Volume=0.024 af Flow (cfs) 0.2 Runoff Depth=3.24" 0.18 0.16 Flow Length=60' 0.14 Tc=0.6 min 0.12 CN=98 0.1 0.08 0.06 0.04 0.02 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)