Crest Width (Top thickness)
Water
The thickness or width of a dam at the level of the top of dam (excluding corbels or parapets). In general, the term thickness is used for gravity and arch dams, and width is used for other dams.
The thickness or width of a dam at the level of the crest (top) of the dam. The term "thickness" is used for gravity and arch dams and "width" for other types of dams.
- — Service Hydrologist Reference Manual Glossary of Hydrologic Terms retrieved 2014-06-01