When base flood elevation data and floodway data are not
available in accordance with Part 208, Rule
3.1, in Special Flood Hazard Areas
and Community Flood Hazard Areas without base flood elevation
data, new construction and substantial improvements shall be elevated or
floodproofed to elevations established by the community. The following
provisions in addition to the standards of Part 208, Rule
5.1 and the enclosure standards of
Part 208, Rule
5.2 (4) shall
apply:
(1) Require that all new
subdivision proposals and other proposed developments (including proposals for
manufactured home parks and subdivisions) greater than five (5) lots or five
(5) acres, whichever is lesser, include within such proposals base flood
elevation data;
(2) The Floodplain
Administrator shall obtain, review, and reasonably utilize any base flood
elevation and floodway data available from a federal, state, or other source,
in order to administer the provisions of Part 208, Rule 5. When such data are
available, standards of Part 208, Rule
5.2, shall apply. If data is not
available from Part 208, Rule
5.2 (1) or outside
sources, then the following provisions shall apply.
(3) No encroachments, including fill material
or other development, shall be located within a distance of the stream bank
equal to five times the width of the stream at the top of the bank or twenty
feet each side from the top of the bank, whichever is greater, unless
certification by a registered professional engineer is provided demonstrating
that such encroachment shall not result in any increase in flood levels during
the occurrence of the base flood discharge. The enclosure standards of Part
208, Rule
5.2
(4) shall apply.
(4) Fill within the area of special flood
hazard shall result in no net loss of natural floodplain storage. The volume of
loss of floodwater storage due to filling in the special flood hazard area
shall be offset by providing an equal volume of flood storage by excavation or
other compensatory measures at or adjacent to the development site.
(5) Notify, in riverine situations, adjacent
communities and the State Coordinating Office prior to any alteration or
relocation of a watercourse and submit copies of such notifications to FEMA.
Assure that the flood carrying capacity within the altered or relocated portion
of any watercourse is maintained.
(6) Require that all manufactured homes be
placed or installed using methods and practices which minimize flood damage.
Manufactured homes must be elevated and anchored to resist flotation, collapse,
or lateral movement. Dry stacked blocks (stacked without the use of mortar or
cement to bond them together) are not allowed within the Special Flood Hazard
Area.
