Nami Rings
Wave Height Range: Below five feet.
The Nami Ring is a patented concrete block shaped like a short section of concrete pipe, 2.5 feet in
diameter by 1-foot high, and weighing 240 pounds. The rings are placed, side-by-side, on a slope over
filter cloth. Better performance has been observed when the rings are joined together with tie rods. Sand
or gravel caught up in the wave turbulence tends to be deposited inside the rings and in the voids between
adjacent rings, adding to the stability of the section and protecting the filter cloth. Because of their
shape, Nami Rings are susceptible to severe abrasion and damage by water-borne cobbles and, therefore,
should be used primarily in sandy environments.
Control Blocks
Wave Height Range: Above five feet.
Control blocks come in various sizes and are similar to standard concrete construction blocks,
except that protrusions in the block ends provide a tongue-and-groove interlock between units. Designed
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