The governing body shall change or supplement the floodplain zoning district boundaries and this title in the manner outlined in Ch. 21.25. Actions which require an amendment to the ordinance and/or submittal of a Letter of Map Change (LOMC) include, but are not limited to, the following:
Any floodplain fill which raises the elevation of the filled area
to a height at or above the flood protection elevation and is contiguous
to land lying outside the floodplain;
Any upgrade to a floodplain zoning ordinance text required by Ch.
NR 116.05, Wis. Adm. Code, or otherwise required by law, or for changes
by the municipality; and
All channel relocations and changes to the maps to alter floodway
lines or to remove an area from the floodway or the floodfringe that
is based on a base flood elevation from a FIRM requires prior approval
by FEMA.