Stormwater Management Report Feb 2026 resubmissionrcd 2 26 2026

2026-02 Proposed Conditions - AJHNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Link 1L: POI #1 Inflow Area = 0.637 ac, 62.17% Impervious, Inflow Depth = 2.72" for 2-Year-Projected event Inflow = 1.91 cfs @ 12.10 hrs, Volume= 0.144 af Primary = 1.91 cfs @ 12.10 hrs, Volume= 0.144 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 1.91 cfs Primary 2 1.91 cfs Inflow Area=0.637 ac Flow (cfs) 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 - AJH NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 1S: EDA #1 - Impervious Runoff = 2.23 cfs @ 12.10 hrs, Volume= 0.170 af, Depth= 5.14" 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 10-Year-Current Rainfall=5.38", 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 2.23 cfs NOAA 24-hr D 2 10-Year-Current Rainfall=5.38" P2=3.47" Runoff Area=0.396 ac Runoff Volume=0.170 af Flow (cfs)

0.396 ac Runoff Volume=0.170 af Flow (cfs) Runoff Depth=5.14" Flow Length=219' 1 Tc=1.7 min CN=98 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 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 10 Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 0.46 cfs @ 12.12 hrs, Volume= 0.032 af, Depth= 1.60" 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 10-Year-Current Rainfall=5.38", 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 0.5 0.46 cfs 0.48 0.46 NOAA 24-hr D 0.44 0.42 10-Year-Current Rainfall=5.38" 0.4 0.38

r D 0.44 0.42 10-Year-Current Rainfall=5.38" 0.4 0.38 P2=3.47" 0.36 0.34 Runoff Area=0.241 ac 0.32 Runoff Volume=0.032 af 0.3 Flow (cfs) 0.28 Runoff Depth=1.60" 0.26 0.24 Flow Length=267' 0.22 0.2 Tc=4.8 min 0.18 CN=61 0.16 0.14 0.12 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)

2026-02 Proposed Conditions - AJH NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Prepared by Dynamic Engineering Printed 2/16/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 11 Summary for Link 1L: POI #1 Inflow Area = 0.637 ac, 62.17% Impervious, Inflow Depth = 3.80" for 10-Year-Current event Inflow = 2.67 cfs @ 12.10 hrs, Volume= 0.202 af Primary = 2.67 cfs @ 12.10 hrs, Volume= 0.202 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 2.67 cfs Primary 2.67 cfs Inflow Area=0.637 ac 2 Flow (cfs) 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 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 12 Summary for Subcatchment 1S: EDA #1 - Impervious Runoff = 2.65 cfs @ 12.10 hrs, Volume= 0.202 af, Depth= 6.13" 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 10-Year-Projected Rainfall=6.37", 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 2.65 cfs NOAA 24-hr D 10-Year-Projected Rainfall=6.37" P2=4.09" 2 Runoff Area=0.396 ac Runoff Volume=0.202 af

noff Area=0.396 ac Runoff Volume=0.202 af Runoff Depth=6.13" Flow (cfs) Flow Length=219' Tc=1.6 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 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 13 Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 0.68 cfs @ 12.12 hrs, Volume= 0.045 af, Depth= 2.26" 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 10-Year-Projected Rainfall=6.37", 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 0.75 Runoff 0.68 cfs 0.7 0.65 NOAA 24-hr D 10-Year-Projected Rainfall=6.37" 0.6

NOAA 24-hr D 10-Year-Projected Rainfall=6.37" 0.6 P2=4.09" 0.55 Runoff Area=0.241 ac 0.5 Runoff Volume=0.045 af 0.45 Runoff Depth=2.26" Flow (cfs) 0.4 Flow Length=267' 0.35 Tc=4.5 min 0.3 CN=61 0.25 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)