Sources of material could be sand dredged from the navigation channel, offshore sites, Grays Harbor, or sand mined from upland sources. This alternative involves placing about one million cubic yards of sand in a 6,000-foot long reach Northward from the North Jetty. The material would be placed as a berm behind temporary sand dikes at the shoreline and upper portions of the beach profile, and shaped to match adjacent beach grades. Renourishment would be required. In the first 25 years the average rate of adding sand to the nourishment area would be 100,000 cubic yards per year then half that rate for the following 25 years.
Unusual storms can dramatically alter the required amount.
The frequency of renourishment would range from two years to longer intervals. This alternative can be used alone or in combination with other alternatives. This alternative can be used alone, in conjunction with direct beach placement of sand, or with other structural alternatives. Structural Structural alternatives make use of human intervention by using rock, concrete, or other hard material to create structures that either block waves, dissipate wave energy, redirect waves or sand, or funnel or move sand around. These structures generally run the length of the area to be protected.