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On damp ground, which is not sufficiently wet to require a boardwalk, access can be provided along a causeway. This should confine trampling, and help protect vulnerable areas. On pond or wetland creation projects, causeways can be included in the design, and their effect on land drainage incorporated in the management of water on the site. On existing sites, care must be taken that a causeway does not have adverse effects on water movement. Where necessary, a causeway can have breaks to allow water to flow through, crossed by short sections of boardwalk or bridge. A causeway can also be used as a support for a boardwalk.
The easiest method of building a causeway is to use a geotextile to support the path material and prevent it sinking into the soft ground below. Many different geotextiles are available, including brands such as Terram, Lotrak and Typar. Suppliers are listed on page 163, or contact local building suppliers. A typical construction is shown below.
Where additional height is needed to provide a dry path, a boardwalk can be constructed on a causeway.
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