2026 05 Storm Water Management Report rcd 5 6 2026

0 Runoff Area=0.377 ac 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) Runoff Volume=0.193 af Runoff Depth=6.13" Flow (cfs) Flow Length=219' Tc=1.6 min 1 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

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)

2026-04 Proposed & Existing CondNOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" 2026-04 Proposed & Existing CondNOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 5/5/2026 Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 31 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Subcatchment 2S: EDA #1 - Pervious Summary for Subcatchment 3S: EDA #2 - Impervious Runoff = 0.44 cfs @ 12.12 hrs, Volume= 0.030 af, Depth= 2.26" Runoff = 0.10 cfs @ 12.10 hrs, Volume= 0.008 af, Depth= 6.13" Routed to Link 1L : POI #1 Routed to Link 2L : POI #2 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs 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" NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Area (ac) CN Description Area (ac) CN Description 0.157 61 >75% Grass cover, Good, HSG B 0.015 98 Paved parking, HSG B 0.157 100.00% Pervious Area

0.015 98 Paved parking, HSG B 0.157 100.00% Pervious Area 0.015 100.00% Impervious Area Tc Length Slope Velocity Capacity Description Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 34 0.0500 0.15 Sheet Flow, A-B 0.5 42 0.0260 1.45 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 4.09" Smooth surfaces n= 0.011 P2= 4.09" 0.5 124 0.0410 4.11 Shallow Concentrated Flow, B-C 0.3 58 0.0300 3.52 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps Paved Kv= 20.3 fps 0.1 13 0.0030 2.69 2.11 Pipe Channel, C-D 0.8 100 Total 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 Concrete pipe, finished Subcatchment 3S: EDA #2 - Impervious 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' Hydrograph n= 0.012 Concrete pipe, finished

Hydrograph n= 0.012 Concrete pipe, finished 0.11 Runoff 4.5 267 Total 0.105 0.10 cfs 0.1 NOAA 24-hr D Subcatchment 2S: EDA #1 - Pervious 0.095 10-Year-Projected Rainfall=6.37" 0.09 Hydrograph 0.085 P2=4.09" 0.08 0.075

0.075 Runoff Area=0.015 ac 0.48 Runoff 0.46 0.44 cfs 0.07 Runoff Volume=0.008 af 0.065 0.44 NOAA 24-hr D Runoff Depth=6.13" Flow (cfs) 0.42 0.06 0.4 10-Year-Projected Rainfall=6.37" 0.055 Flow Length=100' 0.38 0.05 0.36 P2=4.09" Tc=0.8 min

Tc=0.8 min 0.045 0.34 Runoff Area=0.157 ac 0.04 CN=98 0.32 0.3 Runoff Volume=0.030 af 0.035 0.03 Runoff Depth=2.26" Flow (cfs) 0.28 0.025 0.26 0.24 Flow Length=267' 0.02 0.22 0.015 Tc=4.5 min 0.01 0.2 0.18 CN=61 0.005 0.16 0 0.14 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 0.12

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 0.12 Time (hours) 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)

2026-04 Proposed & Existing CondNOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" 2026-04 Proposed & Existing CondNOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Prepared by Dynamic Engineering Printed 5/5/2026 Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 33 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 4S: EDA #2 - Pervious Summary for Subcatchment 5S: EDA #3 - Impervious Runoff = 0.08 cfs @ 12.12 hrs, Volume= 0.005 af, Depth= 2.26" Runoff = 0.11 cfs @ 12.15 hrs, Volume= 0.010 af, Depth= 6.13" Routed to Link 2L : POI #2 Routed to Link 3L : POI #3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs 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" NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Area (ac) CN Description Area (ac) CN Description 0.029 61 >75% Grass cover, Good, HSG B 0.019 98 Unconnected pavement, HSG B 0.029 100.00% Pervious Area

0.019 98 Unconnected pavement, HSG B 0.029 100.00% Pervious Area 0.019 100.00% Impervious Area 0.019 100.00% Unconnected Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) Tc Length Slope Velocity Capacity Description 3.5 20 0.0200 0.10 Sheet Flow, A-B (min) (feet) (ft/ft) (ft/sec) (cfs) Grass: Dense n= 0.240 P2= 4.09" 0.2 9 0.0200 0.96 Sheet Flow, A-B 0.6 133 0.0290 3.46 Shallow Concentrated Flow, B-C Smooth surfaces n= 0.011 P2= 4.09" Paved Kv= 20.3 fps 7.9 91 0.0540 0.19 Sheet Flow, B-C 4.1 153 Total Grass: Dense n= 0.240 P2= 4.09" 0.0 7 0.0540 3.49 Shallow Concentrated Flow, C-D Subcatchment 4S: EDA #2 - Pervious Grassed Waterway Kv= 15.0 fps 8.1 107 Total