Section 12-10-300.5 - Standards for Streams Without Established Base Flood Elevations and/or Floodways (Unnumbered A Zones) Located within the areas of special flood hazard established in Section 300.2, where small no base flood data have been provided or where no floodways have been provided, the following provisions apply:
1. No encroachments, including fill material or structures shall be located within a distance of the stream bank equal to two (2) times the width of the stream at the top of bank or twenty feet each side from top of bank whichever is greater unless certification by a professional engineer (registered in Mississippi) is provided demonstrating that such encroachments shall not result in any increase in flood levels during the occurrence of the base flood discharge; 2. New construction or substantial improvements of structures shall be elevated or flood-proofed to elevations established in accordance with Section 300.2. 12 Miss. Code. R. 10-300.5