2026 05 Storm Water Management Report rcd 5 6 2026

4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 0.22 Runoff Depth=4.12" Flow (cfs) 0.2 0.18 Flow Length=145' 0.16 Tc=8.5 min 0.14 CN=80 0.12 0.1 0.08 0.06 0.04 0.02 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 57 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 58 Pond 1P: UG BASIN Summary for Pond 2P: BIO BASIN Hydrograph Inflow Area = 0.146 ac, 53.42% Impervious, Inflow Depth = 5.19" for 10-Year-Projected event 0.95 cfs Inflow Inflow = 0.84 cfs @ 12.10 hrs, Volume= 0.063 af Primary Outflow = 0.57 cfs @ 12.11 hrs, Volume= 0.055 af, Atten= 32%, Lag= 0.6 min 1 Inflow Area=0.142 ac Primary = 0.57 cfs @ 12.11 hrs, Volume= 0.055 af Routed to Link 4L : POI #1 Peak Elev=619.94'

Routed to Link 4L : POI #1 Peak Elev=619.94' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Storage=0.011 af Peak Elev= 623.36' @ 12.11 hrs Surf.Area= 714 sf Storage= 681 cf Plug-Flow detention time= 132.2 min calculated for 0.055 af (86% of inflow) Flow (cfs) Center-of-Mass det. time= 65.9 min ( 835.1 - 769.2 ) Volume Invert Avail.Storage Storage Description 0.34 cfs #1 622.00' 1,219 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 622.00 323 0 0 623.00 577 450 450 0

623.00 577 450 450 0 624.00 960 769 1,219 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) Device Routing Invert Outlet Devices #1 Primary 619.05' 15.0" Round Culvert L= 35.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 619.05' / 618.93' S= 0.0034 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 622.86' 0.6' long Sharp-Crested Rectangular Weir 2 End Contraction(s) #3 Device 1 623.70' 48.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads

Limited to weir flow at low heads Primary OutFlow Max=0.57 cfs @ 12.11 hrs HW=623.36' (Free Discharge) 1=Culvert (Passes 0.57 cfs of 12.68 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.57 cfs @ 2.31 fps) 3=Grate ( Controls 0.00 cfs)

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 59 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 60 Pond 2P: BIO BASIN Summary for Link 4L: POI #1 Hydrograph Inflow Area = 0.563 ac, 75.31% Impervious, Inflow Depth = 5.45" for 10-Year-Projected event 0.84 cfs Inflow Inflow = 2.61 cfs @ 12.11 hrs, Volume= 0.256 af Primary 0.9 Primary = 2.61 cfs @ 12.11 hrs, Volume= 0.256 af, Atten= 0%, Lag= 0.0 min 0.85 Inflow Area=0.146 ac Routed to nonexistent node 18L 0.8 0.75 Peak Elev=623.36' Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001

0.75 Peak Elev=623.36' Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs 0.7 0.65 0.57 cfs Storage=681 cf Link 4L: POI #1 0.6 0.55 Hydrograph Flow (cfs) 0.5 Inflow 0.45 2.61 cfs Primary 0.4 2.61 cfs 0.35 Inflow Area=0.563 ac 0.3 0.25 0.2 0.15 2 0.1 0.05 Flow (cfs) 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

Flow (cfs) 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) 1 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 61 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 62 Summary for Link 5L: POI #2 Summary for Link 6L: POI #3 Inflow Area = 0.042 ac, 40.48% Impervious, Inflow Depth = 4.93" for 10-Year-Projected event Inflow Area = 0.076 ac, 0.00% Impervious, Inflow Depth = 4.12" for 10-Year-Projected event Inflow = 0.24 cfs @ 12.10 hrs, Volume= 0.017 af Inflow = 0.33 cfs @ 12.16 hrs, Volume= 0.026 af Primary = 0.24 cfs @ 12.10 hrs, Volume= 0.017 af, Atten= 0%, Lag= 0.0 min Primary = 0.33 cfs @ 12.16 hrs, Volume= 0.026 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 18L Routed to nonexistent node 18L 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 5L: POI #2 Link 6L: POI #3

Link 5L: POI #2 Link 6L: POI #3 Hydrograph Hydrograph Inflow Inflow 0.24 cfs Primary 0.33 cfs Primary 0.26 0.24 cfs 0.36 0.33 cfs 0.24 Inflow Area=0.042 ac 0.34 Inflow Area=0.076 ac 0.32 0.22 0.3 0.28 0.2 0.26 0.18 0.24 0.16