A. Information To Be Obtained And Maintained: The responsible agency shall maintain for public inspection all records pertaining to the provisions of this chapter. Where the responsible agency has utilized available base flood elevation data or determined base flood depths and applied the specific standards, the following is required:
1. For new or substantially improved residential structures and manufactured homes:
a. Obtain and record the actual elevation (in relation to mean sea level) of the lowest floor (including basement) of all new or substantially improved structures; and
b. Record whether or not the structure contains a basement.
2. For all new or substantially improved nonresidential structures:
a. Obtain and record the actual elevation (in relation to mean sea level) to which the structure has been floodproofed.
b. Maintain the floodproofing certifications required in subsection 11-1-8B2c of this chapter. (1975 Code § 4-5-4-1)
B. Alteration And Encroachment Of Watercourses: The responsible agency shall:
1. Notify adjacent communities and the Montana floodplain management section of the department of natural resources and conservation, state of Montana (DNRC) prior to any alteration or relocation of a watercourse, and submit evidence of such notification to the federal emergency management agency (FEMA); and
2. Require that the flood carrying capacity is not diminished within the altered or relocated portion of said watercourse; and
3. Where the watercourse is filled, impounded, dredged or diverted or where levees or floodwalls are constructed, require that the flood carrying capacity not be diminished. (1975 Code § 4-5-4-2)
C. Encroachments: Encroachments, including fill, new construction, substantial improvements and other development shall be prohibited in any floodway unless a technical evaluation demonstrates that the encroachments will not result in any increase in flood levels during the occurrence of the base flood discharge. (1975 Code § 4-5-4-3)