It is sometimes necessary to exclude internal region from a topsoil strip. This might be the case if there is a tree or an existing building foundation in the middle of the site. The suggested way of doing this is to edit a reduce element and create an outline within the outline that defines the boundary. The system will treat an internal outline as an inner boundary effectively ‘punching out’ the inner area and excluding it from the reduce operation. You can define as many exclusion areas as you need with additional outlines.
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Topsoil Stripping looks at using the Reduce element to complete topsoil stripping operations and explains the importance of always having the strip depths defined on a different phase to subsequent earthwork elevations. |