2026 05 Storm Water Management Report rcd 5 6 2026

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2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" 2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", 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 17 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 6S: EDA #2 - Pervious Summary for Link 1L: POI #1 Runoff = 0.07 cfs @ 12.17 hrs, Volume= 0.006 af, Depth= 0.86" Inflow Area = 0.534 ac, 70.60% Impervious, Inflow Depth = 2.97" for 2-Year-Projected event Routed to Link 3L : POI #3 Inflow = 1.75 cfs @ 12.10 hrs, Volume= 0.132 af Primary = 1.75 cfs @ 12.10 hrs, Volume= 0.132 af, Atten= 0%, Lag= 0.0 min Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Routed to nonexistent node 15L NOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Area (ac) CN Description 0.084 61 >75% Grass cover, Good, HSG B

CN Description 0.084 61 >75% Grass cover, Good, HSG B Link 1L: POI #1 0.084 100.00% Pervious Area Hydrograph Tc Length Slope Velocity Capacity Description Inflow 1.75 cfs Primary (min) (feet) (ft/ft) (ft/sec) (cfs) 1.75 cfs 8.5 100 0.0540 0.20 Sheet Flow, A-B Inflow Area=0.534 ac Grass: Dense n= 0.240 P2= 4.09" 0.1 16 0.0540 3.49 Shallow Concentrated Flow, B-C Grassed Waterway Kv= 15.0 fps 8.6 116 Total Flow (cfs) Subcatchment 6S: EDA #2 - Pervious 1 Hydrograph Runoff 0.07 0.07 cfs

Runoff 0.07 0.07 cfs 0.065 NOAA 24-hr D 0.06 2-Year-Projected Rainfall=4.09" 0.055 P2=4.09" 0.05 Runoff Area=0.084 ac 0.045 Runoff Volume=0.006 af 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 Runoff Depth=0.86" Flow (cfs) 0.04 Time (hours) 0.035 Flow Length=116' Slope=0.0540 '/' 0.03 Tc=8.6 min 0.025 CN=61 0.02 0.015 0.01 0.005 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 CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", P2=4.09" 2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", 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 19 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Link 2L: POI #2 Summary for Link 3L: POI #3 Inflow Area = 0.044 ac, 34.09% Impervious, Inflow Depth = 1.88" for 2-Year-Projected event Inflow Area = 0.103 ac, 18.45% Impervious, Inflow Depth = 1.41" for 2-Year-Projected event Inflow = 0.09 cfs @ 12.10 hrs, Volume= 0.007 af Inflow = 0.13 cfs @ 12.16 hrs, Volume= 0.012 af Primary = 0.09 cfs @ 12.10 hrs, Volume= 0.007 af, Atten= 0%, Lag= 0.0 min Primary = 0.13 cfs @ 12.16 hrs, Volume= 0.012 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 15L Routed to nonexistent node 15L Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Link 2L: POI #2 Link

Link 2L: POI #2 Link 3L: POI #3 Hydrograph Hydrograph Inflow Inflow 0.1 0.09 cfs Primary 0.15 0.13 cfs Primary 0.095 0.09 cfs 0.13 cfs 0.09 Inflow Area=0.044 ac 0.14 Inflow Area=0.103 ac 0.13 0.085 0.08 0.12 0.075 0.11 0.07

0.11 0.07 0.1 0.065 0.06 0.09 Flow (cfs) Flow (cfs) 0.055 0.08 0.05 0.07 0.045 0.04 0.06 0.035 0.05 0.03 0.04 0.025 0.02 0.03 0.015 0.02 0.01 0.01 0.005 0 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

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2026-04 Proposed & Existing ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 2026-04 Proposed & Existing ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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 21 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 1S: EDA #1 - Impervious Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 2.13 cfs @ 12.10 hrs, Volume= 0.162 af, Depth= 5.14" Runoff = 0.30 cfs @ 12.12 hrs, Volume= 0.021 af, Depth= 1.60" Routed to Link 1L : POI #1 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 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" NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Area (ac) CN Description Area (ac) CN Description 0.377 98 Paved parking, HSG B 0.157 61 >75% Grass cover, Good, HSG B 0.377 100.00% Impervious Area

0.157 61 >75% Grass cover, Good, HSG B 0.377 100.00% Impervious Area 0.157 100.00% Pervious 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) 1.5 100 0.0100 1.09 Sheet Flow, A-B 4.0 34 0.0500 0.14 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" Grass: Dense n= 0.240 P2= 3.47" 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 0.5 124 0.0410 4.11 Shallow Concentrated Flow, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' Paved Kv= 20.3 fps n= 0.013 Corrugated PE, smooth interior 0.1 13 0.0030 2.69 2.11 Pipe Channel, C-D 1.7 219 Total 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 Concrete pipe, finished Subcatchment 1S: EDA #1 - Impervious 0.2 96 0.0144 6.84 8.40 Pipe Channel, D-E