2026 05 Storm Water Management Report rcd 5 6 2026

Peak Elev=623.19' Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs 0.4 Storage=567 cf Link 4L: POI #1 0.33 cfs 0.35 Hydrograph Flow (cfs) 0.3 Inflow 1.64 cfs Primary 0.25 1.64 cfs 0.2 Inflow Area=0.563 ac 0.15 0.1 0.05 Flow (cfs) 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

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) 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 2-Year-Projected Rainfall=4.09", P2=4.09" 2026-04 Proposed & Existing CondiNOAA 24-hr D 2-Year-Projected Rainfall=4.09", 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 31 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 32 Summary for Link 5L: POI #2 Summary for Link 6L: POI #3 Inflow Area = 0.042 ac, 40.48% Impervious, Inflow Depth = 2.82" for 2-Year-Projected event Inflow Area = 0.076 ac, 0.00% Impervious, Inflow Depth = 2.12" for 2-Year-Projected event Inflow = 0.14 cfs @ 12.10 hrs, Volume= 0.010 af Inflow = 0.17 cfs @ 12.16 hrs, Volume= 0.013 af Primary = 0.14 cfs @ 12.10 hrs, Volume= 0.010 af, Atten= 0%, Lag= 0.0 min Primary = 0.17 cfs @ 12.16 hrs, Volume= 0.013 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 0.14 cfs Primary 0.19 0.17 cfs Primary 0.15 0.14 cfs 0.17 cfs 0.14 Inflow Area=0.042 ac 0.18 0.17 Inflow Area=0.076 ac 0.13 0.16 0.12 0.15 0.14 0.11

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

0.03 0.02 0.02 0.01 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 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 33 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 7S: Proposed Roof Summary for Subcatchment 8S: PDA #1 - Impervious to Bio Runoff = 0.80 cfs @ 12.10 hrs, Volume= 0.061 af, Depth= 5.14" Runoff = 0.44 cfs @ 12.10 hrs, Volume= 0.033 af, Depth= 5.14" Routed to Pond 1P : UG BASIN Routed to Pond 2P : BIO BASIN 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 0.142 98 Roofs, HSG D 0.078 98 Paved parking, HSG D 0.142 100.00% Impervious Area

0.078 98 Paved parking, HSG D 0.142 100.00% Impervious Area 0.078 100.00% Impervious 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) 1.0 Direct Entry, 0.5 42 0.0326 1.46 Sheet Flow, A-B Smooth surfaces n= 0.011 P2= 3.47" Subcatchment 7S: Proposed Roof 0.1 18 0.1180 5.53 Shallow Concentrated Flow, B-C (RIP-RAP) Unpaved Kv= 16.1 fps Hydrograph 0.6 60 Total Runoff 0.85 0.80 cfs Subcatchment 8S: PDA #1 - Impervious to Bio 0.8 NOAA 24-hr D 0.75

ment 8S: PDA #1 - Impervious to Bio 0.8 NOAA 24-hr D 0.75 Hydrograph 10-Year-Current Rainfall=5.38" 0.7 0.65 P2=3.47" 0.48 0.44 cfs Runoff 0.46 0.6 Runoff Area=0.142 ac 0.44 NOAA 24-hr D 0.42 0.55 Runoff Volume=0.061 af 0.4 10-Year-Current Rainfall=5.38" Flow (cfs) 0.5 Runoff Depth=5.14" 0.38

0.38 P2=3.47" 0.45 0.36 Tc=1.0 min 0.34 Runoff Area=0.078 ac 0.4 0.32 0.35 CN=98 0.3 Runoff Volume=0.033 af Flow (cfs) 0.28 0.3 0.26 Runoff Depth=5.14" 0.25 0.24 Flow Length=60' 0.2 0.22 0.15 0.2