This property owners were having their bank being undercut at high tide such that some trees had been lost and more were threatened. Due to the steepness of the bank and its approximate 6’ height, a rip rap solution would have required denuding the bank and cutting it back to create a lower slope to support the rock in repose. As the point of land is small with an attractive wooden structure on it, the client did not want to lose that structure or the existing vegetation. While not in a high wave environment, the normal tidal cycles would continue to scour out the soil, expose and then kill the tree root systems. Views that follow show the embankment to the left and right of the dock, then detailed view of undercut.
Reefs were placed to straddle Mean Low Water. Their interlocked pattern will also trap any soils from either direction: up-slope or off-shore. The latter can be stirred up by wave action and deposited in the low energy zone behind and between the reefs. Sand was added behind the reefs to above the height of the undercut to heal it. ReadyReef built a coir log row out in front of part of the embankment to help terrace the steepest slope section. The slope was planted with two types of marsh grass, depending on the elevation. The root structure of the grasses will grow to become the primary soil holding mechanism.
Results to date:
After 5 months of growth, the marsh grasses successfully rooted in place, covering construction materials, and returning the embankment to a stable condition. Fencing is to keep geese from eating young marsh grass plugs.
And then there was an oyster spawn….