2026 05 Storm Water Management Report rcd 5 6 2026

Grassed Waterway Kv= 15.0 fps 8.1 107 Total Hydrograph 0.09 Runoff Subcatchment 5S: EDA #3 - Impervious 0.08 cfs 0.085 Hydrograph 0.08 NOAA 24-hr D 10-Year-Projected Rainfall=6.37" 0.12 Runoff 0.075 0.115 0.11 cfs 0.07 P2=4.09" 0.11 0.065 0.105 NOAA 24-hr D Runoff Area=0.029 ac 0.06 0.1 10-Year-Projected Rainfall=6.37" Runoff Volume=0.005 af

10-Year-Projected Rainfall=6.37" Runoff Volume=0.005 af 0.095 0.055 0.09 P2=4.09" Runoff Depth=2.26" Flow (cfs) 0.05 0.085 Runoff Area=0.019 ac 0.045 Flow Length=153' 0.08 0.075 Runoff Volume=0.010 af 0.04 Tc=4.1 min 0.07 Runoff Depth=6.13" Flow (cfs) 0.035 CN=61 0.065 0.03 0.06 Flow Length=107'

.06 Flow Length=107' 0.055 0.025 0.05 Tc=8.1 min 0.02 0.045 CN=98 0.015 0.04 0.035 0.01 0.03 0.005 0.025 0 0.02 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 0.015 Time (hours) 0.01 0.005

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 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 35 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment 6S: EDA #2 - Pervious Summary for Link 1L: POI #1 Runoff = 0.20 cfs @ 12.16 hrs, Volume= 0.016 af, Depth= 2.26" Inflow Area = 0.534 ac, 70.60% Impervious, Inflow Depth = 4.99" for 10-Year-Projected event Routed to Link 3L : POI #3 Inflow = 2.94 cfs @ 12.10 hrs, Volume= 0.222 af Primary = 2.94 cfs @ 12.10 hrs, Volume= 0.222 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 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 0.084 61 >75% Grass cover, Good, HSG B

ac) 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 2.94 cfs Primary (min) (feet) (ft/ft) (ft/sec) (cfs) 2.94 cfs 8.5 100 0.0540 0.20 Sheet Flow, A-B 3 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 2 Flow (cfs) Subcatchment 6S: EDA #2 - Pervious Hydrograph 0.22 Runoff 0.21 0.20

Hydrograph 0.22 Runoff 0.21 0.20 cfs 0.2 1 NOAA 24-hr D 0.19 0.18 10-Year-Projected Rainfall=6.37" 0.17 P2=4.09" 0.16 0.15 Runoff Area=0.084 ac 0.14 Runoff Volume=0.016 af 0 0.13 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=2.26" Flow (cfs) 0.12 Time (hours) 0.11 Flow Length=116' 0.1 Slope=0.0540 '/' 0.09 0.08 Tc=8.6 min 0.07 CN=61 0.06 0.05 0.04 0.03 0.02 0.01 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

0.04 0.03 0.02 0.01 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 37 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 38 Summary for Link 2L: POI #2 Summary for Link 3L: POI #3 Inflow Area = 0.044 ac, 34.09% Impervious, Inflow Depth = 3.58" for 10-Year-Projected event Inflow Area = 0.103 ac, 18.45% Impervious, Inflow Depth = 2.97" for 10-Year-Projected event Inflow = 0.18 cfs @ 12.10 hrs, Volume= 0.013 af Inflow = 0.30 cfs @ 12.16 hrs, Volume= 0.026 af Primary = 0.18 cfs @ 12.10 hrs, Volume= 0.013 af, Atten= 0%, Lag= 0.0 min Primary = 0.30 cfs @ 12.16 hrs, Volume= 0.026 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 3L: POI

Link 2L: POI #2 Link 3L: POI #3 Hydrograph Hydrograph Inflow Inflow 0.2 0.18 cfs Primary 0.34 0.30 cfs Primary 0.19 0.18 cfs 0.32 0.30 cfs 0.18 Inflow Area=0.044 ac 0.3 Inflow Area=0.103 ac 0.17 0.28 0.16 0.15 0.26 0.14 0.24 0.13