2026 05 Storm Water Management Report rcd 5 6 2026

a (ac) CN Description 0.084 61 >75% Grass cover, Good, HSG B Link 1L: POI #1 0.084 100.00% Pervious Area Hydrograph Tc Length Slope Velocity Capacity Description Inflow 5.76 cfs Primary (min) (feet) (ft/ft) (ft/sec) (cfs) 5.76 cfs 8.5 100 0.0540 0.20 Sheet Flow, A-B 6 Inflow Area=0.534 ac Grass: Dense n= 0.240 P2= 4.09" 0.1 16 0.0540 3.49 Shallow Concentrated Flow, B-C 5 Grassed Waterway Kv= 15.0 fps 8.6 116 Total 4 Flow (cfs) Subcatchment 6S: EDA #2 - Pervious

Flow (cfs) Subcatchment 6S: EDA #2 - Pervious Hydrograph 3 Runoff 0.6 0.57 cfs 2 0.55 NOAA 24-hr D 100-Year-Projected Rainfall=11.52" 0.5 P2=4.09" 1 0.45 Runoff Area=0.084 ac 0.4 Runoff Volume=0.044 af 0 Runoff Depth=6.31" 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 Flow (cfs) 0.35 Time (hours) Flow Length=116' 0.3 Slope=0.0540 '/' 0.25

0.3 Slope=0.0540 '/' 0.25 Tc=8.6 min CN=61 0.2 0.15 0.1 0.05 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 CoNOAA 24-hr D 100-Year-Projected Rainfall=11.52", P2=4.09" 2026-04 Proposed & Existing CoNOAA 24-hr D 100-Year-Projected Rainfall=11.52", 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 55 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 56 Summary for Link 2L: POI #2 Summary for Link 3L: POI #3 Inflow Area = 0.044 ac, 34.09% Impervious, Inflow Depth = 8.00" for 100-Year-Projected event Inflow Area = 0.103 ac, 18.45% Impervious, Inflow Depth = 7.22" for 100-Year-Projected event Inflow = 0.41 cfs @ 12.10 hrs, Volume= 0.029 af Inflow = 0.76 cfs @ 12.16 hrs, Volume= 0.062 af Primary = 0.41 cfs @ 12.10 hrs, Volume= 0.029 af, Atten= 0%, Lag= 0.0 min Primary = 0.76 cfs @ 12.16 hrs, Volume= 0.062 af, Atten= 0%, Lag= 0.0 min Routed to nonexistent node 15L Routed to nonexistent node 15L 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 2L: POI #2 Link 3L: POI

Link 2L: POI #2 Link 3L: POI #3 Hydrograph Hydrograph Inflow Inflow 0.41 cfs Primary 0.85 0.76 cfs Primary 0.44 0.41 cfs 0.8 0.76 cfs 0.42 0.4 Inflow Area=0.044 ac 0.75 Inflow Area=0.103 ac 0.38 0.7 0.36 0.65 0.34 0.32 0.6 0.3 0.55

0.6 0.3 0.55 0.28 0.5 Flow (cfs) Flow (cfs) 0.26 0.24 0.45 0.22 0.4 0.2 0.35 0.18 0.16 0.3 0.14 0.25 0.12 0.1 0.2 0.08 0.15 0.06 0.1 0.04 0.02 0.05 0 0 0 2 4 6 8 10 12 14 16 18 20

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 Conditions Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 2 Rainfall Events Listing (selected events) Event# Event Storm Type Curve Mode Duration B/B Depth AMC P2 Name (hours) (inches) (inches) 1 2-Year-Current NOAA 24-hr D Default 24.00 1 3.47 2 3.47 2 2-Year-Projected NOAA 24-hr D Default 24.00 1 4.09 2 4.09 3 10-Year-Current NOAA 24-hr D Default 24.00 1 5.38 2 3.47 4 10-Year-Projected NOAA 24-hr D Default 24.00 1 6.37 2

4 10-Year-Projected NOAA 24-hr D Default 24.00 1 6.37 2 4.09 5 100-Year-Current NOAA 24-hr D Default 24.00 1 9.18 2 3.47 6 100-Year-Projected NOAA 24-hr D Default 24.00 1 11.52 2 4.09 PROPOSED 7S 8S Proposed Roof PDA #1 - Impervious to Bio 12S 13S 14S PDA #2 - Impervious PDA #2 - Pervious PDA #3 - Pervious 1P 2P 9S UG BASIN BIO BASIN PDA #1 - Pervious to Bio 5L 6L 10S 4L 11S POI #2 POI #3 PDA #1 - Impervious POI #1 PDA #1 - Pervious (On-Site Conveyance) (On-Site Conveyance) Subcat Reach Pond Link Routing Diagram for 2026-04 Proposed & Existing Conditions Prepared by Dynamic Engineering, Printed 5/5/2026

ions Prepared by Dynamic Engineering, Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC