Sand-Filled Bags
Wave Height Range: Below five feet.
Sand-filled bag breakwaters are constructed of stacked bags in a staggered pattern (Figure 64). The
integrity of the structure depends on the individual bags remaining in place and intact. T bags and seams
must be resistant to ultraviolet light to preclude deterioration from prolonged sunlight exposure. They
should not used where vandalism is expected or where the structure will exposed to water-borne debris.
Lighter bags (100-pound range) like those used for revetments, are displaced when exposed to ev
moderate waves. Larger units, such as Dura Bags, are recommend even through they are more difficult
to handle and require filling in place.
A filter cloth should be placed under the bags to reduce settlement in soft bottoms (Figure 65).
During construction bag-to-bag abutment should be insured to minimize wave transmission through gaps
between bags.
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