2026 05 Storm Water Management Report rcd 5 6 2026

0.4 Runoff Area=0.076 ac 0.19 100-Year-Current Rainfall=9.18" 0.18 Runoff Volume=0.043 af 0.17 P2=3.47" 0.35 Runoff Depth=6.74" Flow (cfs) 0.16 Runoff Area=0.025 ac 0.3 0.15 Flow Length=145' 0.14 Runoff Volume=0.014 af 0.25 Tc=9.2 min Runoff Depth=6.74" Flow (cfs) 0.13 0.12 CN=80 0.11

CN=80 0.11 Flow Length=152' 0.2 0.1 Tc=3.7 min 0.15 0.09 0.08 CN=80 0.1 0.07 0.06 0.05 0.05 0.04 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 0.02 Time (hours) 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)

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 71 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 72 Summary for Pond 1P: UG BASIN Pond 1P: UG BASIN Hydrograph Inflow Area = 0.142 ac,100.00% Impervious, Inflow Depth = 8.94" for 100-Year-Current event Inflow = 1.37 cfs @ 12.10 hrs, Volume= 0.106 af 1.37 cfs Inflow Primary Outflow = 0.94 cfs @ 12.11 hrs, Volume= 0.106 af, Atten= 31%, Lag= 0.8 min Primary = 0.94 cfs @ 12.11 hrs, Volume= 0.106 af Inflow Area=0.142 ac Routed to Link 4L : POI #1 Peak Elev=620.82' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 620.82' @ 12.11 hrs Surf.Area= 0.005 ac Storage= 0.017 af

outing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 620.82' @ 12.11 hrs Surf.Area= 0.005 ac Storage= 0.017 af 0.94 cfs Storage=0.017 af 1 Plug-Flow detention time= 11.1 min calculated for 0.106 af (100% of inflow) Flow (cfs) Center-of-Mass det. time= 11.1 min ( 746.7 - 735.7 ) Volume Invert Avail.Storage Storage Description #1 617.75' 0.020 af 48.0" Round Pipe Storage L= 70.0' Device Routing Invert Outlet Devices #1 Primary 617.75' 15.0" Round RCP_Round 15" L= 15.0' RCP, rounded edge headwall, Ke= 0.100 Inlet / Outlet Invert= 617.75' / 617.55' S= 0.0133 '/' Cc= 0.900 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 n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf Time (hours) #2 Device 1 617.75' 3.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 620.25' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #4 Device 1 621.45' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.94 cfs @ 12.11 hrs HW=620.82' (Free Discharge) 1=RCP_Round 15" (Passes 0.94 cfs of 11.85 cfs potential flow) 2=Orifice (Orifice Controls 0.41 cfs @ 8.27 fps) 3=Orifice (Orifice Controls 0.54 cfs @ 2.74 fps) 4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)

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 73 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 74 Summary for Pond 2P: BIO BASIN Pond 2P: BIO BASIN Hydrograph Inflow Area = 0.146 ac, 53.42% Impervious, Inflow Depth = 7.91" for 100-Year-Current event Inflow = 1.25 cfs @ 12.10 hrs, Volume= 0.096 af 1.25 cfs Inflow Primary Outflow = 0.85 cfs @ 12.11 hrs, Volume= 0.088 af, Atten= 32%, Lag= 0.8 min Primary = 0.85 cfs @ 12.11 hrs, Volume= 0.088 af Inflow Area=0.146 ac Routed to Link 4L : POI #1 Peak Elev=623.54' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 623.54' @ 12.11 hrs Surf.Area= 783 sf Storage= 816 cf

=623.54' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 623.54' @ 12.11 hrs Surf.Area= 783 sf Storage= 816 cf 1 0.85 cfs Storage=816 cf Plug-Flow detention time= 102.3 min calculated for 0.088 af (91% of inflow) Flow (cfs) Center-of-Mass det. time= 53.7 min ( 816.1 - 762.4 ) Volume Invert Avail.Storage Storage Description #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 0 623.00 577 450 450 624.00 960 769 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

6' 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=0.85 cfs @ 12.11 hrs HW=623.54' (Free Discharge) 1=Culvert (Passes 0.85 cfs of 13.04 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.85 cfs @ 2.69 fps) 3=Grate ( Controls 0.00 cfs)

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 75 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 76 Summary for Link 4L: POI #1 Summary for Link 5L: POI #2 Inflow Area = 0.563 ac, 75.31% Impervious, Inflow Depth = 8.21" for 100-Year-Current event Inflow Area = 0.042 ac, 40.48% Impervious, Inflow Depth = 7.63" for 100-Year-Current event Inflow = 4.27 cfs @ 12.11 hrs, Volume= 0.385 af Inflow = 0.37 cfs @ 12.10 hrs, Volume= 0.027 af Primary = 4.27 cfs @ 12.11 hrs, Volume= 0.385 af, Atten= 0%, Lag= 0.0 min Primary = 0.37 cfs @ 12.10 hrs, Volume= 0.027 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 4.27 cfs Primary 0.37 cfs Primary 4.27 cfs 0.4 0.37 cfs Inflow Area=0.563 ac 0.38 0.36 Inflow Area=0.042 ac 4 0.34 0.32 0.3

0.3 0.28 3 0.26 0.24 Flow (cfs) Flow (cfs) 0.22 0.2 0.18 2 0.16 0.14 0.12 0.1 1 0.08 0.06