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Anchoring Methods for Large Woody Debris Structures

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

Citation:  Paper number  032035,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13759) @2003
Authors:   Kenneth R. Worster
Keywords:   Soil anchor, Large Woody Debris, Bioengineering, Duckbill, Manta Ray, Stingray, Screwin anchor, Wire rope grip, Cabling to boulders, Specific gravity of wood, Forces on large woody debris

Proper anchoring of LWD structures is essential to the success of a bioengineering project. This paper covers three of the more common anchoring methods used, which include driven soil anchors, screw-in soil anchors, and cabling to boulders or bedrock. Also covered is a method for estimating the pullout capacity required of the anchor and connecting of the anchor to the LWD structure. Selection of an anchoring method and sizing the anchor requires information about the expected streamflows and soil characteristics. From the streamflow information the required pullout capacity per anchor can be estimated, and the anchor type and method can be selected from the soil information. Once the anchor has been installed, the LWD structure must be firmly held into place by the anchor. This requires applying tension to the wire rope that connects the anchor to the LWD structure. An effective method for achieving this is described in the paper.

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