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Decision Tree: Build a Rock Sill for Marsh Toe Protection
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5b(2). BUILD A ROCK SILL FOR MARSH TOE PROTECTION
Moderate and high fetches (longer than ½ mile) support the formation of larger, potentially erosive waves. Although the existence of a marsh at the site indicates that conditions are appropriate for marsh growth, the larger waves may be eroding the leading edge of the marsh and/or the width of the marsh may not fully reduce the wave energy, resulting in upland erosion. Placing a sill at the channelward edge of the marsh should provide long-term protection for the marsh, allowing the marsh to provide greater protection to the upland.
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This marsh area has a moderate/high fetch with a marsh >15 ft wide. It requires the support of a sill channelward of the edge of the marsh. |
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