Which portion of the dam comes in contact with the ground at the downstream end?

A dam is a structure built across a river or waterway to control water flow and consists of: a foundation, abutments, crest, spillway, outlet works, embankment, heel, toe, and a protective layer. The heel is the portion of the dam that contacts the ground on the upstream side. The toe is the portion of the dam that is in direct contact with the ground or riverbed at the downstream side, Crest is the uppermost part of the dam which is sometimes used as a road/pedestrian, etc.