(a) For purposes of this section:
(1) NATURAL CHANNEL SETBACK LINE means that setback line described below located the farther beyond the crest:
(A) That line formed by the intersection of the surface of the land and the vertical plane located a horizontal distance of 20 feet beyond the crest.
(B) That line formed by the intersection of the surface of the land beyond the crest and a plane passing through the toe and extending upward and outward from the channel at the designated slope. For purposes of this paragraph, the designated slope is:
(i) four to one if the channel contains clay or shale soil; and
(ii) three to one in all other cases.
(2) CREST means that line at the top of the bank where the slope becomes less than four to one.
(3) TOE means that line at the bottom of the bank where the slope becomes less than four to one.
(b) Except as otherwise provided in Subsection (c), all development must be located behind the natural channel setback line.
(c) A structurally engineered retention system approved by the director may be substituted for the setback required in Subsection (b). (Ord. Nos. 19786; 24085; 25047; 28073; 32039)