Definitions.
Base flood.
The flood level having a one percent chance of being equaled
or exceeded in any given year.
Flood or flooding.
A general and temporary condition of partial or complete
inundation of normally dry land area lying outside normal stream channel
as result of one or more of the following occurrences or conditions:
the overflow of inland or tidal waters, or the unusual and rapid accumulation
or runoff of surface waters from any source.
Flood insurance.
The insurance coverage provided under the National Flood
Insurance Program.
Flood insurance rate map (FIRM).
An official map on which the Federal Insurance Administration
has delineated both the areas of special flood hazards and the risk
premium zones, on file in the office of the director of public works.
Flood, 100-year.
A flood estimated to occur at an average of once in 100 years
(one percent frequency of occurrence), determined from an analysis
of historical flood and rainfall records and computed in accordance
with accepted methodology to the satisfaction of the public works
director.
Floodproofing.
Any combination of structural and nonstructural additions,
changes or adjustments to structures which reduce or eliminate flood
damage to real estate or improved real property, water, and sanitary
facilities, structures, and their contents.
Floodway.
The “Floodway” refers to those areas in and along
Dry, Linda, Cirby and Antelope Creeks as shown in those certain aerial
photographic maps designated as “Official Floodplain Maps”
of the City of Roseville, dated October 1973 and kept and maintained
in the office of the director of public works.
Floodway fringe.
The “floodway fringe” refers to those areas in
and along Dry, Linda, Cirby and Antelope Creeks as shown in those
certain aerial photographic maps designated as “Official Floodplain
Maps” of the City of Roseville, dated October 1973 and kept
and maintained in the office of the director of public works.
Freeboard.
The vertical height distance between the water surface elevation
of the 100-year flood and typically the lowest habitable floor of
a building or accessory structure. Freeboard represents a safety factor
for flood protection and, as such, is also used in the design of levees
and altered stream channels.
Lowest floor.
The lowest floor of the lowest enclosed area (including basement)
of a structure. An unfurnished or flood resistant enclosure, usable
solely for vehicular parking, building access, or storage, in an area
other than a basement area, is not considered a structure’s
lowest floor; provided, that such enclosure is not built so as to
render the structure in violation of any applicable non-elevation
design requirements of this title.
Regulatory floodway.
The channel of a river, creek, or other watercourse and the
adjacent land areas that must be reserved in order to discharge the
base flood without cumulatively increasing the water surface elevation
more than one foot. The regulatory floodway is delineated on the FIRM.