Copper Creek Master Plan Master Plan Brent McCrea Scott Christensen Amy Holt Amy Holt Jared Erickson Robert Ryzska CE 472 – Senior Design April 2012
Overview
WMS – Hydrologic Analysis • HMS model was used to Volume Condition CN Q p (cfs) (ft 3 ) p predict 100 year storm event y runoff Pre-Development 67.7 134 2883510 • WMS used to set up HMS Post-Development 73.9 213.6 4141620 model • SCS Curve Number used as loss method
WMS – Hydrologic Analysis Cont. Cont.
Channel Design Inner channel to hold 2 ‐ yr flow; lined with flow; lined with cobbles. Outer channel to hold 100 ‐ yr flow; lined with grass.
HEC ‐ RAS Hydraulic Analysis of Natural Channel Top Left: Natural Channel in WMS Right: After X ‐ Sec extraction from WMS Bottom Left: HEC ‐ RAS model of natural channel flow
HEC ‐ RAS Hydraulic Analysis of Designed Channel Entire channel after design Entire channel after design Larger X ‐ Sec due to contraction of channel X ‐ Sec of main channel
Detention Basin Detention Basin Storage 420 ft 25 40 ft 20 ft) 34 Storage (ac ‐ f 15 10 5 0 0 1000 2000 3000 4000 Time (min) Detention Basin Outlet 250 250 200 Geometry Routed Hydrograph Length Width Height(req) Height (design) Side Slope 150 420 340 6.12 7.25 2 (cfs) Pre ‐ Development Flow Q Post ‐ Develoment Flow 100 Outlet Pipe 50 Diameter (ft) 3.75 Height above Base Elev (ft) 0 0 Manning's n 0.015 0 500 1000 1500 2000 2500 3000 3500 Slope (ft/ft) 0.012727 Orifice Coefficient 0.6 Time (min) Base Elevation (ft) 4935
Conclusion Cost Analysis Recommendations • Detention Basin • Open Channel Volume of 991208 ft 3 • Inner Channel to hold 2 ‐ yr • • Estimated cost of $288,000 flow Cost includes • • • Outer Channel to hold Outer Channel to hold • • Excavation Excavation • Grading 100 ‐ yr flow • All finishing costs • Detention Basin for post ‐ • Open Channel development runoff Volume of 138,600 ft 3 • Estimated cost of $142,000 • Cost Includes • Excavation Excavation • • Site Prep and • Survey Piped Flow Piped Flow • • Estimated Cost of $480,000
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