Roughened Channel Design and Construction

Author: Miller, Daniel S., Inter-Fluve, Inc

Video Presentation

Abstract

Stream bed and bank construction using roughened channel methods are a useful tool for fish passage, channel creation, grade control and ford crossings. A sampling of available aquatic organism passage (AOP) guidelines and roughened channel design references will be presented. This presentation will focus on lessons learned from the design and construction of dozens of roughened channels throughout the Pacific Northwest and Alaska. Design of roughened channels acknowledges that every project is unique; considerations for site specific goals and design criteria are presented and illustrated with project example photos. Design steps including stream flow hydrology, channel hydraulics and stone sizing and gradation are outlined; with more in-depth discussion of design for stone stability and permeability control using the Fuller/Thompson equation for sizing small stone fraction. An example of project plans and specifications are presented. The importance of in-field guidance/direction by the designer directly with the equipment operator during construction is discussed. Tips for infield inspection and adaptive management of stone placement are discussed. Examples of roughened channel construction are presented with photos to illustrate stone properties, mechanical and washing for thorough mixing of large and small stone sizes and finished product. Expectations of roughened channel performance are discussed.

Citation

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