2026 05 Storm Water Management Report rcd 5 6 2026

14 0.24 0.13 0.22 0.12 0.2 Flow (cfs) Flow (cfs) 0.11 0.18 0.1 0.16 0.09 0.08 0.14 0.07 0.12 0.06 0.1 0.05 0.08 0.04 0.06 0.03 0.02 0.04 0.01 0.02 0

0.02 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 CondiNOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" 2026-04 Proposed & Existing CondiNOAA 24-hr D 100-Year-Current Rainfall=9.18", 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 39 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 40 Summary for Subcatchment 1S: EDA #1 - Impervious Summary for Subcatchment 2S: EDA #1 - Pervious Runoff = 3.64 cfs @ 12.10 hrs, Volume= 0.281 af, Depth= 8.94" Runoff = 0.85 cfs @ 12.12 hrs, Volume= 0.057 af, Depth= 4.37" Routed to Link 1L : POI #1 Routed to Link 1L : POI #1 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 100-Year-Current Rainfall=9.18", P2=3.47" NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Area (ac) CN Description Area (ac) CN Description 0.377 98 Paved parking, HSG B 0.157 61 >75% Grass cover, Good, HSG B 0.377 100.00% Impervious Area

0.157 61 >75% Grass cover, Good, HSG B 0.377 100.00% Impervious Area 0.157 100.00% 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) 1.5 100 0.0100 1.09 Sheet Flow, A-B 4.0 34 0.0500 0.14 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" Grass: Dense n= 0.240 P2= 3.47" 0.2 119 0.0400 10.53 12.92 Pipe Channel, B-C 0.5 124 0.0410 4.11 Shallow Concentrated Flow, B-C 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' Paved Kv= 20.3 fps n= 0.013 Corrugated PE, smooth interior 0.1 13 0.0030 2.69 2.11 Pipe Channel, C-D 1.7 219 Total 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.012 Concrete pipe, finished Subcatchment 1S: EDA #1 - Impervious 0.2 96 0.0144 6.84 8.40 Pipe Channel, D-E

bcatchment 1S: EDA #1 - 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 4 4.8 267 Total Runoff 3.64 cfs NOAA 24-hr D Subcatchment 2S: EDA #1 - Pervious 100-Year-Current Rainfall=9.18" Hydrograph 3 P2=3.47" 0.95 Runoff Runoff Area=0.377 ac 0.9 0.85 cfs Runoff Volume=0.281 af 0.85 NOAA 24-hr D

0.85 NOAA 24-hr D Runoff Depth=8.94" 0.8 Flow (cfs) 100-Year-Current Rainfall=9.18" 0.75 2 Flow Length=219' P2=3.47" 0.7 Tc=1.7 min 0.65 Runoff Area=0.157 ac CN=98 0.6 Runoff Volume=0.057 af 0.55 Runoff Depth=4.37" Flow (cfs) 1 0.5

Flow (cfs) 1 0.5 0.45 Flow Length=267' 0.4 Tc=4.8 min 0.35 CN=61 0.3 0 0.25 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) 0.2 0.15 0.1 0.05 0

0.05 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 CondiNOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" 2026-04 Proposed & Existing CondiNOAA 24-hr D 100-Year-Current Rainfall=9.18", 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 41 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 42 Summary for Subcatchment 3S: EDA #2 - Impervious Summary for Subcatchment 4S: EDA #2 - Pervious Runoff = 0.14 cfs @ 12.10 hrs, Volume= 0.011 af, Depth= 8.94" Runoff = 0.16 cfs @ 12.12 hrs, Volume= 0.011 af, Depth= 4.37" Routed to Link 2L : POI #2 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 100-Year-Current Rainfall=9.18", P2=3.47" NOAA 24-hr D 100-Year-Current Rainfall=9.18", P2=3.47" Area (ac) CN Description Area (ac) CN Description 0.015 98 Paved parking, HSG B 0.029 61 >75% Grass cover, Good, HSG B 0.015 100.00% Impervious Area

0.029 61 >75% Grass cover, Good, HSG B 0.015 100.00% Impervious Area 0.029 100.00% 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 1.34 Sheet Flow, A-B 3.8 20 0.0200 0.09 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" Grass: Dense n= 0.240 P2= 3.47" 0.3 58 0.0300 3.52 Shallow Concentrated Flow, B-C 0.6 133 0.0290 3.46 Shallow Concentrated Flow, B-C Paved Kv= 20.3 fps Paved Kv= 20.3 fps 0.8 100 Total 4.4 153 Total Subcatchment 3S: EDA #2 - Impervious Subcatchment 4S: EDA #2 - Pervious Hydrograph Hydrograph 0.16 Runoff