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Decision Tree: Create a Marsh, Protect the Toe with a Sill
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7b(1). CREATE A MARSH, PROTECT THE TOE WITH A SILL
Shallow water depths allow the conversion of subtidal waters to intertidal area with a minimum amount of fill, and the marsh created is more likely to persist than it would in a deep water situation. Marsh creation will increase the intertidal width, and vegetation will help reduce wave energy. Placing a sill at the channelward edge of the newly created marsh should provide long-term protection for the marsh, allowing the marsh to provide protection to the upland.
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Here a gapped sill channelward of the marsh is used to protect an area with moderate fetch and relatively shallow water depth. The gap allows fauna to access the marsh while it remains protected by the sill system. |
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