Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJ NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 14 Summary for Link 1L: POI #1 Inflow Area = 0.637 ac, 62.17% Impervious, Inflow Depth = 4.67" for 10-Year-Projected event Inflow = 3.29 cfs @ 12.10 hrs, Volume= 0.248 af Primary = 3.29 cfs @ 12.10 hrs, Volume= 0.248 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 3.29 cfs Primary 3.29 cfs Inflow Area=0.637 ac 3 Flow (cfs) 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)

2026-02 Proposed Conditions - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 1S: EDA #1 - Impervious Runoff = 3.82 cfs @ 12.10 hrs, Volume= 0.295 af, Depth= 8.94" Routed to Link 1L : 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 100-Year-Current Rainfall=9.18", P2=3.47" Area (ac) CN Description * 0.396 98 Impervious Surfaces 0.396 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.5 100 0.0100 1.09 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 1.7 219 Total Subcatchment 1S: EDA #1 - Impervious Hydrograph Runoff 4 3.82 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" 3 Runoff Area=0.396 ac Runoff Volume=0.295 af

Runoff Area=0.396 ac Runoff Volume=0.295 af Runoff Depth=8.94" Flow (cfs) Flow Length=219' 2 Tc=1.7 min CN=98 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)

2026-02 Proposed Conditions - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 1.30 cfs @ 12.12 hrs, Volume= 0.088 af, Depth= 4.37" Routed to Link 1L : 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 100-Year-Current Rainfall=9.18", P2=3.47" Area (ac) CN Description 0.241 61 >75% Grass cover, Good, HSG B 0.241 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.0 34 0.0500 0.14 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" 0.5 124 0.0410 4.11 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps 0.1 13 0.0030 2.69 2.11 Pipe Channel, C-D 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 Concrete pipe, finished 0.2 96 0.0144 6.84 8.40 Pipe Channel, D-E 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 Concrete pipe, finished 4.8 267 Total Subcatchment 2S: EDA #1 - Pervious Hydrograph Runoff 1.30 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47"

100-Year-Current Rainfall=9.18" P2=3.47" 1 Runoff Area=0.241 ac Runoff Volume=0.088 af Runoff Depth=4.37" Flow (cfs) Flow Length=267' Tc=4.8 min CN=61 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 - AJ NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 17 Summary for Link 1L: POI #1 Inflow Area = 0.637 ac, 62.17% Impervious, Inflow Depth = 7.21" for 100-Year-Current event Inflow = 5.07 cfs @ 12.11 hrs, Volume= 0.383 af Primary = 5.07 cfs @ 12.11 hrs, Volume= 0.383 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 5.07 cfs Primary 5.07 cfs 5 Inflow Area=0.637 ac 4 Flow (cfs) 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)

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 18 Summary for Subcatchment 1S: EDA #1 - Impervious Runoff = 4.80 cfs @ 12.10 hrs, Volume= 0.372 af, Depth=11.28" Routed to Link 1L : 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 100-Year-Projected Rainfall=11.52", P2=4.09" Area (ac) CN Description * 0.396 98 Impervious Surfaces 0.396 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 100 0.0100 1.18 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 1.6 219 Total Subcatchment 1S: EDA #1 - Impervious Hydrograph Runoff 5 4.80 cfs NOAA 24-hr D 100-Year-Projected Rainfall=11.52" 4 P2=4.09" Runoff Area=0.396 ac Runoff Volume=0.372 af

Runoff Area=0.396 ac Runoff Volume=0.372 af Runoff Depth=11.28" Flow (cfs) 3 Flow Length=219' Tc=1.6 min CN=98 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)

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 19 Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 1.90 cfs @ 12.12 hrs, Volume= 0.127 af, Depth= 6.31" Routed to Link 1L : 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 100-Year-Projected Rainfall=11.52", P2=4.09" Area (ac) CN Description 0.241 61 >75% Grass cover, Good, HSG B 0.241 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 34 0.0500 0.15 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 4.09" 0.5 124 0.0410 4.11 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps 0.1 13 0.0030 2.69 2.11 Pipe Channel, C-D 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 Concrete pipe, finished 0.2 96 0.0144 6.84 8.40 Pipe Channel, D-E 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.012 Concrete pipe, finished 4.5 267 Total Subcatchment 2S: EDA #1 - Pervious Hydrograph Runoff 2 1.90 cfs NOAA 24-hr D 100-Year-Projected Rainfall=11.52"

100-Year-Projected Rainfall=11.52" P2=4.09" Runoff Area=0.241 ac Runoff Volume=0.127 af Runoff Depth=6.31" Flow (cfs) Flow Length=267' 1 Tc=4.5 min CN=61 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)