Range of Allowable Stone Weights. The range for both the armor and underlayer is 0.75W to
1.25W with 75% of the stones weighing more than W. All stones should be sized so that no side is
greater than 3 times its least dimension.
Armor Layer.
Wmin = 0.75 x 310 = 235 pounds.
Wmax 1.25 x 310 = 390 pounds.
75% must exceed 310 pounds.
Underlayer.
Wmin = 0.75 x 30 = 20 pounds.
Wmax = 1.25 x 30 = 40 pounds.
75% must exceed 30 pounds.
Filter Cloth. A properly sized filter cloth will allow water to pass while retaining the bluf f soil.
When laying the filter cloth, insure continuous coverage by overlapping the cloth edges at least 18
inches.
Toe Protection. Bury the toe (extend the slope down into shore) at least one design wave height
below the existing bottom. Add an additional layer of armor stone to thicken the toe section.
Flank Protection. The revetment will be tied into the existing bank.
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