Tree Revetments

Adapted from the Streambank and Shoreline Protection Manual (LCSMC/USDA-NRCS, 2002)

Definition

A tree revetment is constructed from whole trees (except rootwads) that are usually cabled together and anchored by earth anchors, which are buried in the bank. This technique captures sediment and enhances conditions for colonization of vegetation.

Applicability

• Not appropriate near bridges or other structures where there is high potential for downstream damage if the revetment dislodges during flood events.
• May be damaged in streams where heavy ice flows occur.

Effectiveness

• Uses inexpensive, readily available materials to form semi-permanent protection.
• Has a limited life and needs to be replaced periodically, depending on climate and duration of tree species used.

Advantages

• Natural appearance.
• Can use recycled material (e.g. discarded Christmas trees).
• Provides habitat value both above and below the water line.
• Protects both the toe of slope and bank from the erosive force of water.
• Has self-repairing abilities following damage after flood events if used in combination with soil bioengineering techniques.

Disadvantages

• Requires periodic maintenance to replace damaged or deteriorating trees.
• May invite colonization of non-native species along with native species.

References

LCSMC and USDA-NRCS. 2002. Streambank and Shoreline Protection Manual. Lake County (Illinois) Stormwater Management Commission and USDA-NRCS. http://www.co.lake.il.us/