SEC. 51A-5.103. COMPLIANCE IN UNDESIGNATED FLOODPLAIN AREAS.

   (a)   A person shall comply with the requirements of this article for FP areas before developing land within the design flood line of a creek or stream having a contributing drainage area of 100 acres or more, even if the land has not been formally designated as an FP area.

   (b)   Except as provided in Subsection (c), alterations of the natural floodplain in areas with less than 100 acres must comply with the Dallas Development Code and city drainage standards but are not subject to the engineering requirements for filling in Section 51A-5.105(g).

   (c)   If the proposed alteration includes moving, eliminating, or enclosing the natural stream channel, then the engineering requirements for filling in Section 51A-5.105(g) must be met, regardless of the upstream drainage area size. (Ord. Nos. 19455; 19786; 24085; 27697; 30994; 32039)