Vegetated Geogrids

hard maple, or beech trees are common)are then laid along the bank, in anoverlapping pattern, with the basal endsorientated upstream. The trunks of thetrees are then secured to the anchorswith cables. Other vegetative plantingsor soil bioengineering techniques can beconstructed at the same time toencourage the development of avegetative community.Prices vary significantly, but the cost fora tree revetment can be $600/lf or more.It has been found that tree revetmentswill last from 10 to 15 years, dependingon how frequently the trees aresubmerged. Maintenance requirementswill depend on the amount of largefloods endured, how well the ends of thestructure are secured, and the amount oftime the trees spend in the water.AdaptabilityTree revetments are not considered veryadaptable in that they must be secured tothe embedded anchors. The addition ofa new layer requires connecting to anexisting anchor or the installation of anew one and thus significant effort interms of excavation.AdvantagesTree revetments have many advantagesover other engineered shore protectionapproaches, among them are:• They use inexpensive and typicallyreadily available materials.• They can act as a natural sedimentaccumulator, enhancing certainhabitats.• They are self repairing.DisadvantagesTree revetments have manydisadvantages compared to otherengineered shore protection approaches,among them are:• They can present a hazard if a tree isdislodged during a storm event.• They have a limited lifespan and willeventually need to be replaced.• They are susceptible to damage fromice and debris.• They require periodic maintenance.Similar TechniquesAlternatives may include: rootwadrevetments, gabions, crib walls andrevetments.DRAFT