2026 05 Storm Water Management Report rcd 5 6 2026

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 53 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 54 Summary for Subcatchment 12S: PDA #2 - Impervious Summary for Subcatchment 13S: PDA #2 - Pervious Runoff = 0.11 cfs @ 12.10 hrs, Volume= 0.009 af, Depth= 6.13" Runoff = 0.13 cfs @ 12.11 hrs, Volume= 0.009 af, Depth= 4.12" Routed to Link 5L : POI #2 Routed to Link 5L : 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 10-Year-Projected Rainfall=6.37", P2=4.09" NOAA 24-hr D 10-Year-Projected Rainfall=6.37", P2=4.09" Area (ac) CN Description Area (ac) CN Description 0.017 98 Paved parking, HSG D 0.025 80 >75% Grass cover, Good, HSG D 0.017 100.00%

0.025 80 >75% Grass cover, Good, HSG D 0.017 100.00% Impervious Area 0.025 100.00% 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) 0.5 42 0.0260 1.45 Sheet Flow, A-B 1.7 8 0.0200 0.08 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 4.09" Grass: Dense n= 0.240 P2= 4.09" 0.3 58 0.0300 3.52 Shallow Concentrated Flow, B-C 0.1 6 0.0150 0.79 Sheet Flow, B-C Paved Kv= 20.3 fps Smooth surfaces n= 0.011 P2= 4.09" 0.8 100 Total 1.1 5 0.0200 0.07 Sheet Flow, C-D Grass: Dense n= 0.240 P2= 4.09" Subcatchment 12S: PDA #2 - Impervious 0.6 133 0.0290 3.46 Shallow Concentrated Flow, D-E

w Concentrated Flow, D-E Paved Kv= 20.3 fps Hydrograph 3.5 152 Total 0.125 Runoff 0.12 0.11 cfs Subcatchment 13S: PDA #2 - Pervious 0.115 0.11 NOAA 24-hr D Hydrograph 0.105 10-Year-Projected Rainfall=6.37" 0.1 0.095 P2=4.09" 0.14 0.13 cfs Runoff 0.09 0.085 Runoff Area=0.017 ac 0.13 NOAA 24-hr D 0.08 Runoff Volume=0.009 af 0.12 10-Year-Projected Rainfall=6.37" 0.075 Runoff Depth=6.13" Flow (cfs) 0.07

Runoff Depth=6.13" Flow (cfs) 0.07 0.11 P2=4.09" 0.065 Flow Length=100' 0.06 0.1 Runoff Area=0.025 ac 0.055 Tc=0.8 min Runoff Volume=0.009 af 0.05 0.09 0.045 CN=98 Runoff Depth=4.12" Flow (cfs) 0.08 0.04 0.035 0.07 Flow Length=152' 0.03 0.025 0.06

Tc=3.5 min 0.02 0.05 CN=80 0.015 0.01 0.04 0.005 0 0.03 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) 0.02 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)