APPENDIX D - GROINS
Stacked Bags
Wave Height Range: Below five feet.
A stacked bag groin is similar to a stacked bag breakwater (Figure D-1). The bags can either be
sand or grout-filled. A with breakwaters (APPENDIX C), larger bags are recommended because lighter,
smaller bags are too susceptible to displacement by waves. The suggested recommendations for bag
breakwaters apply to groins. The bags in the photo were filled between wooden forms to achieve their
block shape, but this was unnecessary. When installed properly, stacked bag groins have performed well.
They should only b considered a short-term solution however when filled with sand.
Gabions
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