One method of stabilizing shorelines is to use a rock revetment. For a revetment to be effective, there must be a filter layer placed below the armor stones and the toe of the bank must be protected as well.

 

While revetments are suitable for steep slopes, revetments will not work on a fully vertical slope. Typically, the steepest the slope can be for a revetment to be effective is 2:1 (Hardaway et al., 1999).

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Using armor stone that is too small for a revetment can also lead to an ineffective structure because the rocks may slide down the slope. To prevent this from happening, the size of the stone is determined from calculating the design wave height which is found from interpreting the wave climate of the site in which the revetment will be installed. 

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Decision Matrices Results:

 

Dublin Hollow site: 4.10 / 5.0

 

Dam site: 4.50 / 5.0

 

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Pros:

1.  Easy to maintain

2. Long life span

3. Optimal wave protection

4. Easy to install