2026 05 Storm Water Management Report rcd 5 6 2026

0.084 61 >75% Grass cover, Good, HSG B 0.019 100.00% Impervious Area 0.084 100.00% Pervious Area 0.019 100.00% Unconnected 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) 9.2 100 0.0540 0.18 Sheet Flow, A-B 0.2 9 0.0200 0.88 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" Smooth surfaces n= 0.011 P2= 3.47" 0.1 16 0.0540 3.49 Shallow Concentrated Flow, B-C 8.5 91 0.0540 0.18 Sheet Flow, B-C Grassed Waterway Kv= 15.0 fps Grass: Dense n= 0.240 P2= 3.47" 9.3 116 Total 0.0 7 0.0540 3.49 Shallow Concentrated Flow, C-D Grassed Waterway Kv= 15.0 fps Subcatchment 6S: EDA #2 - Pervious 8.7 107 Total Hydrograph Subcatchment 5S: EDA #3 -

Hydrograph Subcatchment 5S: EDA #3 - Impervious Runoff 0.14 0.13 cfs Hydrograph 0.13 NOAA 24-hr D 0.095 0.09 cfs Runoff 0.12 10-Year-Current Rainfall=5.38" 0.09 NOAA 24-hr D 0.11 P2=3.47" 0.085 10-Year-Current Rainfall=5.38" 0.1 Runoff Area=0.084 ac 0.08 0.075 P2=3.47" 0.09 Runoff Volume=0.011 af Flow (cfs) 0.07

Flow (cfs) 0.07 0.08 Runoff Depth=1.60" 0.065 Runoff Area=0.019 ac 0.07 Flow Length=116' 0.06 Runoff Volume=0.008 af Slope=0.0540 '/' Flow (cfs) 0.06 0.055 Runoff Depth=5.14" 0.05 Flow Length=107' 0.05 Tc=9.3 min 0.045 Tc=8.7 min 0.04 CN=61 0.04 0.03 0.035 CN=98 0.03 0.02 0.025

CN=98 0.03 0.02 0.025 0.01 0.02 0.015 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 0.01 Time (hours) 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 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 27 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 28 Summary for Link 1L: POI #1 Summary for Link 2L: POI #2 Inflow Area = 0.534 ac, 70.60% Impervious, Inflow Depth = 4.10" for 10-Year-Current event Inflow Area = 0.044 ac, 34.09% Impervious, Inflow Depth = 2.81" for 10-Year-Current event Inflow = 2.41 cfs @ 12.10 hrs, Volume= 0.183 af Inflow = 0.14 cfs @ 12.10 hrs, Volume= 0.010 af Primary = 2.41 cfs @ 12.10 hrs, Volume= 0.183 af, Atten= 0%, Lag= 0.0 min Primary = 0.14 cfs @ 12.10 hrs, Volume= 0.010 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 1L: POI #1 Link 2L: POI #2

Link 1L: POI #1 Link 2L: POI #2 Hydrograph Hydrograph Inflow Inflow 2.41 cfs Primary 0.14 cfs Primary 2.41 cfs 0.15 0.14 cfs Inflow Area=0.534 ac 0.14 Inflow Area=0.044 ac 0.13 0.12 2 0.11 0.1 0.09 Flow (cfs)

0.09 Flow (cfs) Flow (cfs) 0.08 0.07 0.06 1 0.05 0.04 0.03 0.02 0.01 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 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) Time (hours)

2026-04 Proposed & Existing ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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 29 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 30 Summary for Link 3L: POI #3 Summary for Subcatchment 1S: EDA #1 - Impervious Inflow Area = 0.103 ac, 18.45% Impervious, Inflow Depth = 2.26" for 10-Year-Current event Runoff = 2.52 cfs @ 12.10 hrs, Volume= 0.193 af, Depth= 6.13" Inflow = 0.22 cfs @ 12.16 hrs, Volume= 0.019 af Routed to Link 1L : POI #1 Primary = 0.22 cfs @ 12.16 hrs, Volume= 0.019 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 15L 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" Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Area (ac) CN Description Link 3L: POI #3

Area (ac) CN Description Link 3L: POI #3 0.377 98 Paved parking, HSG B Hydrograph 0.377 100.00% Impervious Area Inflow Tc Length Slope Velocity Capacity Description 0.22 cfs Primary 0.24 0.22 cfs (min) (feet) (ft/ft) (ft/sec) (cfs) 0.23 0.22 Inflow Area=0.103 ac 1.4 100 0.0100 1.18 Sheet Flow, A-B 0.21 Smooth surfaces n= 0.011 P2= 4.09" 0.2 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 0.19 0.18 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' 0.17 n= 0.013 Corrugated PE, smooth interior 0.16 0.15 1.6 219 Total Flow (cfs)

0.16 0.15 1.6 219 Total Flow (cfs) 0.14 0.13 0.12 Subcatchment 1S: EDA #1 - Impervious 0.11 0.1 Hydrograph 0.09 0.08 Runoff 0.07 2.52 cfs 0.06 0.05 NOAA 24-hr D 0.04 10-Year-Projected Rainfall=6.37" 0.03 0.02 P2=4.09" 0.01 2 0