2026 05 Storm Water Management Report rcd 5 6 2026

0.075 0.26 10-Year-Current Rainfall=5.38" Runoff Area=0.017 ac 0.07 0.24 P2=3.47" 0.065 Runoff Volume=0.007 af Flow (cfs) 0.22 0.06 Runoff Depth=5.14" Runoff Area=0.071 ac 0.055 0.2 0.05 Flow Length=100' Runoff Volume=0.019 af 0.18 0.045 Tc=0.8 min Flow (cfs) 0.16 Runoff Depth=3.23" 0.04 Flow

Runoff Depth=3.23" 0.04 Flow Length=381' 0.035 CN=98 0.14 0.03 0.12 Tc=5.3 min 0.025 0.1 CN=80 0.02 0.015 0.08 0.01 0.06 0.005 0 0.04 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 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 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 39 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 40 Summary for Subcatchment 13S: PDA #2 - Pervious Summary for Subcatchment 14S: PDA #3 - Pervious Runoff = 0.10 cfs @ 12.11 hrs, Volume= 0.007 af, Depth= 3.23" Runoff = 0.25 cfs @ 12.16 hrs, Volume= 0.020 af, Depth= 3.23" Routed to Link 5L : POI #2 Routed to Link 6L : POI #3 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-Current Rainfall=5.38", P2=3.47" NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" Area (ac) CN Description Area (ac) CN Description 0.025 80 >75% Grass cover, Good, HSG D 0.076 80 >75% Grass cover, Good, HSG D 0.025 100.00% Pervious

0.076 80 >75% Grass cover, Good, HSG D 0.025 100.00% Pervious Area 0.076 100.00% 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) 1.8 8 0.0200 0.07 Sheet Flow, A-B 8.9 83 0.0400 0.15 Sheet Flow, A-B Grass: Dense n= 0.240 P2= 3.47" Grass: Dense n= 0.240 P2= 3.47" 0.1 6 0.0150 0.73 Sheet Flow, B-C Using McCuen-Spiess flow length Smooth surfaces n= 0.011 P2= 3.47" 0.3 62 0.0540 3.49 Shallow Concentrated Flow, 1.2 5 0.0200 0.07 Sheet Flow, C-D Grassed Waterway Kv= 15.0 fps Grass: Dense n= 0.240 P2= 3.47" 9.2 145 Total 0.6 133 0.0290 3.46 Shallow Concentrated Flow, D-E Paved Kv= 20.3 fps Subcatchment 14S: PDA #3 - Pervious 3.7 152 Total

Subcatchment 14S: PDA #3 - Pervious 3.7 152 Total Hydrograph Subcatchment 13S: PDA #2 - Pervious 0.28 Runoff 0.25 cfs Hydrograph 0.26 NOAA 24-hr D 0.24 0.11 0.10 cfs Runoff 10-Year-Current Rainfall=5.38" 0.22 0.105 NOAA 24-hr D P2=3.47" 0.1 0.2 0.095 10-Year-Current

0.2 0.095 10-Year-Current Rainfall=5.38" Runoff Area=0.076 ac 0.09 0.18 P2=3.47" Runoff Volume=0.020 af 0.085 Flow (cfs) 0.16 0.08 Runoff Area=0.025 ac Runoff Depth=3.23" 0.075 0.07 Runoff Volume=0.007 af 0.14 Flow Length=145' 0.12 Tc=9.2 min Flow (cfs) 0.065 0.06 Runoff Depth=3.23" 0.055 Flow Length=152'

Runoff Depth=3.23" 0.055 Flow Length=152' 0.1 CN=80 0.05 0.08 0.045 Tc=3.7 min 0.06 0.04 CN=80 0.035 0.04 0.03 0.025 0.02 0.02 0 0.015 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 0.01 Time (hours) 0.005 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 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 41 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 42 Summary for Pond 1P: UG BASIN Pond 1P: UG BASIN Hydrograph Inflow Area = 0.142 ac,100.00% Impervious, Inflow Depth = 5.14" for 10-Year-Current event Inflow = 0.80 cfs @ 12.10 hrs, Volume= 0.061 af 0.80 cfs Inflow Primary Outflow = 0.31 cfs @ 12.13 hrs, Volume= 0.061 af, Atten= 62%, Lag= 1.7 min 0.85 Primary = 0.31 cfs @ 12.13 hrs, Volume= 0.061 af 0.8 Inflow Area=0.142 ac Routed to Link 4L : POI #1 0.75 0.7

0.7 Peak Elev=619.58' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 619.58' @ 12.13 hrs Surf.Area= 0.006 ac Storage= 0.009 af 0.65 Storage=0.009 af 0.6 0.55 Plug-Flow detention time= 9.0 min calculated for 0.061 af (100% of inflow) Flow (cfs) 0.5 Center-of-Mass det. time= 9.0 min ( 752.4 - 743.4 ) 0.45 0.4 Volume Invert Avail.Storage Storage Description 0.35 0.31 cfs #1 617.75' 0.020 af 48.0" Round Pipe Storage 0.3 L= 70.0' 0.25 0.2 Device Routing Invert Outlet Devices 0.15 #1 Primary 617.75' 15.0" Round RCP_Round 15" 0.1 L= 15.0' RCP, rounded edge headwall, Ke= 0.100 0.05

0.1 L= 15.0' RCP, rounded edge headwall, Ke= 0.100 0.05 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=0.31 cfs @ 12.13 hrs HW=619.58' (Free Discharge) 1=RCP_Round 15" (Passes 0.31 cfs of 7.33 cfs potential flow) 2=Orifice (Orifice Controls 0.31 cfs @ 6.28 fps) 3=Orifice ( Controls 0.00 cfs) 4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)