Grout-Filled Bags
Wave Height Range: Below five feet.
The major advantage of grout-filled bags is that the units hold their shape after the fabric
deteriorates or is torn. Again, use of larger bags is recommended because the smaller ones are
susceptible to displacement. In addition, larger units reduce the number of bag contact points where
openings may develop. The recommendations made for sand-filled bags also apply to grout-filled bags,
except that vandalism is not a major concern.
Gabions
Wave Height Range: Below five feet.
The same basic design considerations for gabion revetments also hold here. The wire
mesh should be PVC-coated, the baskets should be tightly packed, and a filter cloth should be used
beneath the structure to help control settlement. A gabion mat should be provided around the structure to
protect against scour. Tight packing of the stone is particularly important to avoid large distortion of the
baskets under wave action. A typical cross section and photograph of a gabion breakwater are shown on
Figures 66 and 67.
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