The orientation and position of cracking is important. Frequently with subsidence the cracking is diagonal and parallel; the direction and location can be used to determine the location of the greatest subsidence. An imaginary line drawn at right angles to the crack roughly points to where the subsidence is worst. With heave one often obtains a near-vertical tapered crack, wider at the top than at the bottom. With heave one frequently can find a drainage gully near the bottom of the crack.

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