Sedimentation Study for the Rochester, Minnesota, Flood-Control Projectby David T. Williams, Waterways Experiment Station, Hydraulics Lab, Vicksburg, MS, USA,
Abstract: In a cooperative effort, the U. S. Army Engineer District, St. Paul (NCS), and the Soil Conservation Service (SCS) planned a combined flood-control project. The SCS portion of the project is land treatment to aid in erosion control of the drainage basin and construction of seven reservoirs. NCS has proposed channel modifications, levees, and other structural features as well as floodplain regulation changes to reduce the flooding hazard. The impacts of proposed channel modifications and impoundments on the sediment transport characteristics are determined. The analysis includes: (a) the impact of sediment scour/deposition on the water-surface elevations during floods, (b) location and extent of scour and deposition, (c) future dredging requirements with estimated frequency, volume, and location, and (d) recommendations on modifications to the design to reduce adverse impacts, reduce first cost, and minimize maintenance. The 'Network' version of the computer program 'HEC-6, Scour and Deposition in Rivers and Reservoirs,' is used.
Subject Headings: Floods | Sediment | Soil treatment | Erosion | Scour | Computer analysis | Sediment transport | Reservoirs | Drainage basins | North America | United States | Minnesota | South Carolina | North Carolina
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