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 ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", 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 43 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 44 Summary for Pond 2P: BIO BASIN Pond 2P: BIO BASIN Hydrograph Inflow Area = 0.146 ac, 53.42% Impervious, Inflow Depth = 4.25" for 10-Year-Current event Inflow = 0.69 cfs @ 12.10 hrs, Volume= 0.052 af 0.69 cfs Inflow Primary Outflow = 0.47 cfs @ 12.11 hrs, Volume= 0.043 af, Atten= 32%, Lag= 0.7 min 0.75 Primary = 0.47 cfs @ 12.11 hrs, Volume= 0.043 af 0.7 Inflow Area=0.146 ac Routed to Link 4L : POI #1 0.65 0.6

0.6 Peak Elev=623.29' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 623.29' @ 12.11 hrs Surf.Area= 686 sf Storage= 630 cf 0.55 0.47 cfs Storage=630 cf 0.5 Plug-Flow detention time= 148.2 min calculated for 0.043 af (83% of inflow) 0.45 Flow (cfs) Center-of-Mass det. time= 72.4 min ( 845.1 - 772.7 ) 0.4 0.35 Volume Invert Avail.Storage Storage Description 0.3 #1 622.00' 1,219 cf Custom Stage Data (Prismatic)Listed below (Recalc) 0.25 0.2 Elevation Surf.Area Inc.Store Cum.Store 0.15 (feet) (sq-ft) (cubic-feet) (cubic-feet) 0.1 622.00 323 0 0

feet) 0.1 622.00 323 0 0 623.00 577 450 450 0.05 624.00 960 769 1,219 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) 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 Primary OutFlow Max=0.47 cfs @ 12.11 hrs HW=623.29' (Free Discharge) 1=Culvert (Passes 0.47 cfs of 12.54 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.47 cfs @ 2.13 fps) 3=Grate ( Controls 0.00 cfs)

2026-04 Proposed & Existing ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 2026-04 Proposed & Existing ConditNOAA 24-hr D 10-Year-Current Rainfall=5.38", 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 45 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 46 Summary for Link 4L: POI #1 Summary for Link 5L: POI #2 Inflow Area = 0.563 ac, 75.31% Impervious, Inflow Depth = 4.49" for 10-Year-Current event Inflow Area = 0.042 ac, 40.48% Impervious, Inflow Depth = 4.00" for 10-Year-Current event Inflow = 2.18 cfs @ 12.11 hrs, Volume= 0.211 af Inflow = 0.20 cfs @ 12.10 hrs, Volume= 0.014 af Primary = 2.18 cfs @ 12.11 hrs, Volume= 0.211 af, Atten= 0%, Lag= 0.0 min Primary = 0.20 cfs @ 12.10 hrs, Volume= 0.014 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 4L: POI #1 Link 5L: POI #2

Link 4L: POI #1 Link 5L: POI #2 Hydrograph Hydrograph Inflow Inflow 2.18 cfs Primary 0.22 0.20 cfs Primary 2.18 cfs 0.21 0.20 cfs Inflow Area=0.563 ac 0.2 Inflow Area=0.042 ac 0.19 2 0.18 0.17 0.16 0.15

0.15 0.14 0.13 Flow (cfs) Flow (cfs) 0.12 0.11 0.1 1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02

0.03 0.02 0.01 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 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 47 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 48 Summary for Link 6L: POI #3 Summary for Subcatchment 7S: Proposed Roof Inflow Area = 0.076 ac, 0.00% Impervious, Inflow Depth = 3.23" for 10-Year-Current event Runoff = 0.95 cfs @ 12.10 hrs, Volume= 0.073 af, Depth= 6.13" Inflow = 0.25 cfs @ 12.16 hrs, Volume= 0.020 af Routed to Pond 1P : UG BASIN Primary = 0.25 cfs @ 12.16 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 18L 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 6L: POI #3

Area (ac) CN Description Link 6L: POI #3 0.142 98 Roofs, HSG D Hydrograph 0.142 100.00% Impervious Area Inflow Tc Length Slope Velocity Capacity Description 0.25 cfs Primary 0.28 0.25 cfs (min) (feet) (ft/ft) (ft/sec) (cfs) 0.26 Inflow Area=0.076 ac 1.0 Direct Entry, 0.24 0.22 Subcatchment 7S: Proposed Roof 0.2 Hydrograph 0.18 Runoff 0.95 cfs Flow (cfs) 0.16

0.95 cfs Flow (cfs) 0.16 1 0.14 NOAA 24-hr D 0.12 10-Year-Projected Rainfall=6.37" 0.1 P2=4.09" 0.08 Runoff Area=0.142 ac 0.06 Runoff Volume=0.073 af Runoff Depth=6.13" Flow (cfs) 0.04 Tc=1.0 min 0.02