All uses allowed in the floodway and floodway fringe subject to the issuance of a permit, according to the provisions of Section 15.28-.330, shall require permits from the floodplain administrator for unnumbered A Zone floodplains. Also, the provisions of Section 15.28.330 apply to the A Zone floodplains with no floodway delineated or water surface profile computed. Since there are no one-hundred-year floodwater surface profiles computed for A Zone floodplains, the following conditions also apply:

A. Elevation data on the one-hundred-year flood shall be provided for subdivision proposals according to the definitions and rules of the Montana Sanitation in Subdivisions Act, MCA 76-4 Part 1 and the rules adopted by DHES under this Act. These data shall be used in applying Sections 15.28.330(C), (D) and (E) of this chapter. Subdivision proposals shall also provide for adequate drainage to minimize potential flood hazards;

B. The floodplain administrator may obtain, review and reasonably use any base flood elevation and floodway data available from federal, state or other sources, until such data have been provided by FEMA, to enforce Sections 15.28.330(C) and (D) of this chapter;

C. The floodplain administrator may use historical flood elevations to determine suitable fill or floodproofing elevations as required by Sections 15.28.330(C) and (D) of this chapter;

D. If historical flood evidence is not available, then the floodplain administrator shall determine, from a field review at the proposed development site, an appropriate fill or floodproofing elevation to use in applying Sections 15.28.330(C) and (D) of this chapter. In the absence of depth or elevation information, a minimum two-foot flood depth shall be used; and

E. Proposed structures must be anchored to prevent floatation or collapse and must be located as far from stream channels as practicable. (Ord. 576 § 7(2), 1994)