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Two Stage Channel Design, A Comparison of Two Methodologies

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

Citation:  Paper number  701P0904,  . (doi: 10.13031/2013.17370)
Authors:   Warren C. High

Much attention has been given to two stage channels in recent years due to the need to convey small frequency storm events (i.e. 20 to 100 years floods) in a large channel while maintaining a small natural meandering stream that conveys bedload, maintains water quality, and provides habitat. In nature a floodplain and a natural stream would perform this function. In an urban environment, we have historically resorted to a trapezoidal ditch. A reasonable compromise is a two stage channel. A properly constructed two stage channel is self sustaining because it conveys bedload, it does not aggrade or degrade, and the only maintenance is the occasional removal of large woody vegetation to maintain the desired flow capacity.

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