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RESTORING MINNESOTA’S AILING RIVERS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  701P0904,  . (doi: 10.13031/2013.17374)
Authors:   L.P. Aadland
Keywords:   

The rivers of Minnesota have been damaged by watershed changes, channelization, and fragmentation through dam construction. Watershed changes such as cultivation of prairie and forest, wetland drainage and urbanization have affected hydrology and sediment yield. Channelization directly alters instream habitat but also initiates degradation and aggradation processes that may extend well upstream and downstream of the project area. Dam construction blocks fish migrations and initiates reservoir sedimentation and tailwater degradation that damages habitat. Traditional hard engineering approaches have generally ignored fluvial process and consequently have caused numerous maintenance and ecological problems. This paper focuses on restoration of natural channels and fluvial processes, dam removal, and restored fish passage. The approach involves application of reference reach geomorphic data in channel design. Several case examples will be presented.

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