The governing body shall change or supplement the floodplain zoning district boundaries and this chapter in the manner outlined in §
580-40 below. Actions which require an amendment to the chapter and/or submittal of a Letter of Map Change (LOMC) include, but are not limited to, the following:
A. Any fill or floodway encroachment that obstructs flow causing any
increase in the regional flood height;
(1) In AE Zones with a mapped floodway where an increase of 0.00 foot
or more is proposed, or in A Zones without mapped floodway where an
increase of 1.0 foot or greater is proposed, no obstructions or increases
shall be permitted unless the applicant receives a Conditional Letter
of Map Revision from FEMA prior to construction; followed by a Letter
of Map Revision and subsequent amendments to this chapter, the Official
Floodplain Zoning Maps, floodway lines and water surface profiles
following construction. Any such alterations must be reviewed and
approved by FEMA and the DNR.
(2) In A Zones without mapped floodway where an increase of less than
1.0 foot is proposed no obstructions or increases shall be permitted
unless the applicant receives a Letter of Map Revision and subsequent
amendments to this chapter, the Official Floodplain Zoning Maps, floodway
lines and water surface profiles following construction.
B. Any change to the floodplain boundaries and/or watercourse alterations
on the FIRM;
C. Any changes to any other officially adopted floodplain maps listed in §
580-6A(2);
D. 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;
E. Correction of significant discrepancies between the water surface
profiles and floodplain maps;
F. Any upgrade to a floodplain zoning ordinance text required by § NR
116.05, Wis. Adm. Code, or otherwise required by law, or for changes
by the Village Board; and
G. 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.