Exceedance of Allowable Velocity in Bank Stability

by William T. Fullerton, Lenzotti & Fullerton Consulting, Engineers, Inc, United States,
James G. Kuiken, Lenzotti & Fullerton Consulting, Engineers, Inc, United States,

Document Type: Proceeding Paper

Part of: Sediment Transport Modeling


The authors have developed a method to account for flow duration in the application of the allowable velocity method through comparison with observed bank instabilities on a river system. The methodology was developed using data from a 200-mile reach of the James River in North Dakota. The exceedance frequency of velocities in excess of the allowable velocity was developed from flow-duration data and used to establish a threshold for the amount of time the allowable velocity must be exceeded in order for bank instability to be expected. In the case of the James River, channel stability could be expected to occur if the allowable velocity was exceeded more than the 0.003 fraction of time. The authors believe the exceedance probability is a reasonable factor to be included with the allowable velocity method and should be considered in analyzing and predicting channel stability response to altered flow regime.

Subject Headings: River bank stabilization | River flow | Fluid velocity | Flow duration | Channel stabilization | Streamflow | Soil analysis | North Dakota | United States

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