Define the Cracking - underwater inspection of bridge?

A crack is a linear fracture in concrete. There can be several types of cracks starting from surface and going into the concrete element. However, all cracks are not critical. Vertical cracks in pier and abutments are indicative of differential settlement of the foundation. Excessive compression in concrete becomes evident by a series of progressive cracks parallel to the force. When reporting cracks, the length, width, location, and orientation (horizontal, vertical, or diagonal) should be noted.