Canyon Edge definition
Canyon Edge means the upper termination of a canyon. In cases where the top edge is rounded away from the face of the canyon as a result of erosional processes related to the presence of the canyon face, the canyon edge shall be defined as that point nearest the canyon beyond which the downward gradient of the land surface increases more or less continuously until it reaches the general gradient of the canyon. In a case where there is a steplike feature at the top of the canyon face, the landward edge of the topmost riser shall be taken to be the canyon edge.