The Common Council may change or supplement the floodplain zoning district boundaries and this chapter in the manner outlined in §
466-45 below. 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:
A. Any fill or floodway encroachment that obstructs flow causing any
increase in the regional flood height;
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 §
466-5B;
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 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 City;
G. All channel relocations and changes to the maps to alter floodway
lines or to remove an area from the floodway or the flood-fringe that
is based on a base flood elevation from a FIRM require prior approval
by FEMA.
Ordinance amendments may be made upon petition of any party according to the provisions of § 62.23, Wis. Stats. The petitions shall include all data required by §§
466-21 and
466-30B. The land use permit shall not be issued until a letter of map revision is issued by FEMA for the proposed changes.
A. The proposed amendment shall be referred to the Plan Commission for
a public hearing and recommendation to the Common Council. The amendment
and notice of public hearing shall be submitted to the Department
regional office for review prior to the hearing. The amendment procedure
shall comply with the provisions of § 62.23, Wis. Stats.
B. No amendments pursuant to this section shall become effective until
reviewed and approved by the Department.
C. All persons petitioning for a map amendment that obstructs flow,
causing any increase in the regional flood height, shall obtain flooding
easements or other appropriate legal arrangements from all adversely
affected property owners and notify local units of government before
the amendment can be approved by the Common Council.