2026 05 Storm Water Management Report rcd 5 6 2026

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

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)