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STREAM STABILITY INVENTORY AND EVALUATION

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

Citation:  Paper number  701P0904,  . (doi: 10.13031/2013.17414)
Authors:   Wayne S. Kinney and Ruth Book
Keywords:   Streambank, stream stability, morphology, channel evolution model, bankfull

Inventory and evaluation of streambank erosion requires an understanding of the cause of the perceived problems. Sometimes, causes of instability are visible on-site, but many times it is necessary to consider activities in other reaches of the stream or in the watershed. Also, the problem may not be instability at all, but rather a naturally occurring process that is incompatible with the existing land use. This paper reviews the concepts of stream stability and equilibrium, along with a Channel Evolution Model (CEM), as background material. It then presents a detailed procedure for data collection and analysis to facilitate the understanding of the dynamics of a subject stream and to prepare for the design of measures to correct the problems. Published data and field-collected measurements are analyzed and compared; when all valid data match closely, the level of confidence in the analysis is high, and assessment of the situation can proceed. The suggested procedure relies heavily on a spreadsheet tool developed by Illinois NRCS to collect and compare all available relevant data, but the same analysis can be successfully accomplished without the software. Finally, parameters developed from the collected data are used in a departure analysis to categorize existing conditions and identify the current CEM stage, particularly applied to typical stream conditions in Illinois.

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