Located within the Special Flood Hazard Areas established in Article III, Section
B, where streams exist with base flood data provided but where no floodways
have been designated (Zones AE), the following provisions apply:
1. No encroachments, including fill material, new construction and
substantial improvements shall be located within areas of special
flood hazard, unless certification by a Tennessee registered
professional engineer is provided demonstrating that the cumulative
effect of the proposed development, when combined with all other
existing and anticipated development, will not increase the water
surface elevation of the base flood more than one (1) foot at any
point within the community. The engineering certification should be
supported by technical data that conforms to standard hydraulic
engineering principles.
2. New construction and substantial improvements of buildings, where
permitted, shall comply with all applicable flood hazard reduction
provisions of Article V, Sections A and B.
Section E. Standards for Streams without Established Base Flood
Elevations and Floodways (A Zones)
Located within the Special Flood Hazard Areas established in Article III, Section
B, where streams exist, but no base flood data has been provided and where a
Floodway has not been delineated, the following provisions shall apply:
1. The Administrator shall obtain, review, and reasonably utilize any
Base Flood Elevation and floodway data available from any
Federal, State, or other sources, including data developed as a
result of these regulations (see 2 below), as criteria for requiring
that new construction, substantial improvements, or other
development in approximate A Zones meet the requirements of
Article V, Sections A and B.
2. Require that all new subdivision proposals and other proposed
developments (including proposals for manufactured home parks
and subdivisions) greater than 50 lots or 5 acres, whichever is the
lesser, include within such proposals Base Flood Elevation data.
3. Within approximate A Zones, where Base Flood Elevations have
not been established and where such data is not available from
other sources, require the lowest floor of a building to be elevated
or floodproofed to a level of at least three (3) feet above the highest
adjacent grade (as defined in Article II). All applicable data
including elevations or floodproofing certifications shall be recorded
as set forth in Article IV, Section B. Openings sufficient to facilitate
automatic equalization of hydrostatic flood forces on exterior walls
shall be provided in accordance with the standards of Article V,
Section B.
4. Within approximate A Zones, where Base Flood Elevations have
not been established and where such data is not available from
other sources, no encroachments, including structures or fill
material, shall be located within an area equal to the width of the