Clays that expand or swell when in contact with water (such as the montmorillonite clays) can cause problems for roads and structures supported on such soil. The expansive-swelling property can also...

Clays that expand or swell when in contact with water (such as the montmorillonite clays) can cause problems for roads and structures supported on such soil. The expansive-swelling property can also make this type of clay almost impervious (acting as a barrier to the passage or flow of water), a feature that can be used to advantage for handling the water and seepage conditions associated with some construction projects. Briefly, indicate the type of situation where this waterbarrier feature could be utilized.