Shoreline. Since a Lok-Gard revetment has a smooth surface, increased runup heights must be
considered in the design.
Terrafix Blocks
Wave Height Range: Above five feet.
Terrafix blocks are patented units that join together with a mortise and tenon system, and have two
cone-shaped projections, which fit holes in the bottom of the adjacent block (Figure 46). In addition,
holes through the center of each block allow for stainless steel wire connection of many individual
blocks. The uniform interlocking of the 50-pound units creates a neat, clean appearance (Figure 53).
Stacked Bags or Mats
Wave Height Range: Below five feet.
Several manufacturers produce bags and mats in various sizes and fabrics that are commonly filled with
either sand or a lean mixture of concrete for use in revetments. While no special equipment is required
for sand-filled units, a mixer, and possibly a pump, are needed for concrete-filled units. Bags should be
filled and stacked against a prepared slope with their long axes parallel to the shoreline and joints offset
as in brick work (Figure 54). Grout-filled bags can be further stabilized by steel rods driven through the
bags.
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