Location of potentially disturbing influences

Anything that increases or reduces the soil water content is liable to cause some disturbance, if the change is more than a certain amount. The location of nearby trees especially in a clay soil, location of drains especially in more granular or silty-type soil (e.g.: River Terraces) and location of drains in extremely dry clay is also of interest. If a tree which existed prior to construction is removed either just before or after construction of a house, then one runs the risk of a heave as the clay regains its original moisture content and expands.

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