because the smaller ones are susceptible to displacement. In addition, larger bags reduce the number of
bag contact points where openings may develop.
Recommendations made for sand-filled bags also apply to groutfilled bags, except that vandalism
is not a major concern.
Gabions
Wave Height Range: Below five feet.
The same basic design considerations given for gabion revetments (APPENDIX B) apply 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 cross section and photograph of a gabion breakwater are
shown in Figures C-5 and C-6.
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