2026 05 Storm Water Management Report rcd 5 6 2026

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 13 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 14 Summary for Subcatchment 2S: EDA #1 - Pervious Summary for Subcatchment 3S: EDA #2 - Impervious Runoff = 0.15 cfs @ 12.13 hrs, Volume= 0.011 af, Depth= 0.86" Runoff = 0.06 cfs @ 12.10 hrs, Volume= 0.005 af, Depth= 3.85" 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 2-Year-Projected Rainfall=4.09", P2=4.09" NOAA 24-hr D 2-Year-Projected Rainfall=4.09", 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 0.07 Runoff 4.5 267 Total 0.06 cfs 0.065 NOAA 24-hr D Subcatchment 2S: EDA #1 - Pervious 0.06 2-Year-Projected Rainfall=4.09" Hydrograph 0.055 P2=4.09" 0.17 0.05 Runoff Area=0.015 ac Runoff 0.16 0.15 cfs 0.045

off 0.16 0.15 cfs 0.045 Runoff Volume=0.005 af NOAA 24-hr D Runoff Depth=3.85" Flow (cfs) 0.15 0.04 0.14 2-Year-Projected Rainfall=4.09" 0.035 Flow Length=100' 0.13 P2=4.09" 0.03 Tc=0.8 min 0.12 Runoff Area=0.157 ac 0.025 CN=98 0.11 0.1 Runoff Volume=0.011 af 0.02 Flow (cfs) 0.09 Runoff Depth=0.86" 0.015 0.08 Flow Length=267' 0.01

0.015 0.08 Flow Length=267' 0.01 0.07 Tc=4.5 min 0.005 0.06 CN=61 0 0.05 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) 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)