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 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

2 0.15 0.2 Tc=0.6 min 0.18 0.1 0.16 CN=98 0.05 0.14 0.12 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 0.1 Time (hours) 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

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)