Definitions. The following definitions shall apply in the interpretation and enforcement of this section:
100-YEAR FLOODA flood that, on the average, is likely to occur once every 100 years (i.e., that has a 1% chance of occurring each year, although the flood may occur in any year).
BASE FLOODA flood having a 1% chance of being equaled or exceeded in any given year.
BASE FLOOD ELEVATIONThe Federal-Emergency-Management-Agency-designated 100-year water surface elevation.
BASEMENTAny area of the building having its floor subgrade (below ground level) on all sides.
DEVELOPMENTAny man-made change to improved or unimproved real estate, including, but not limited to, buildings or other structures, the placement of manufactured homes, street and other paving, utilities, mining, dredging, filling, grading, paving, excavation or drilling operations or storage of equipment or materials.
ELEVATED BUILDINGA no-basement building built to have the lowest floor elevated above the ground level by means of fill, solid foundation perimeter walls, pilings, or columns (posts and piers).
ENCROACHMENTThe advance or infringement of uses, plant growth, fill, excavation, buildings, permanent structures or development into a floodplain, which may impede or alter the flow capacity of a floodplain.
FLOOD or FLOODING(1) A general and temporary condition of partial or complete inundation of normally dry land areas from the overflow of inland waters or the unusual and rapid accumulation or runoff of surface waters from any source; or
(2) The collapse or subsidence of land along the shore of a lake or other body of water as a result of erosion or undermining caused by waves or currents of water exceeding anticipated cyclical levels or suddenly caused by an unusually high water level in a natural body of water, accompanied by a severe storm, or by an unanticipated force of nature, such as a flash flood, or by some similarly unusual and unforeseeable event which results in flooding as defined in Subsection
(1) of this definition.
FLOODWAYThe channel of a river 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.
FREEBOARDA factor of safety usually expressed in feet above a flood level for purposes of floodplain management. "Freeboard" tends to compensate for the many unknown factors that could contribute to flood heights greater than the height calculated for a selected size flood and floodway conditions, such as bridge openings and the hydrological effect of urbanization in the watershed.
HISTORIC STRUCTUREAny structure that is:
(1) Listed individually in the National Register of Historic Places (a listing maintained by the Department of the Interior) or preliminarily determined by the Secretary of the Interior as meeting the requirement for individual listing on the National Register;
(2) Certified or preliminarily determined by the Secretary of the Interior as contributing to the historical significance of a registered historic district or a district preliminarily determined by the Secretary to qualify as a registered historic district; or
(3) Individually listed on the Virginia State Inventory of Historic Places.
LOWEST FLOORThe lowest floor of the lowest enclosed area (including basement). An unfinished or flood-resistant enclosure usable solely for parking of vehicles, building access or storage in an area other than a basement area is not considered a building's lowest floor, provided that such enclosure is not built so as to render the structure in violation of the applicable nonelevation design requirements of Federal Code 44 CFR § 60.3.
MANUFACTURED HOMEA structure, transportable in one or more sections, which is eight feet or more in width and 40 feet or more in length, or when erected is 320 or more square feet in area, and which is built on a permanent chassis and is designed to be used with or without a permanent foundation when connected to the required utilities, and includes the plumbing, heating, air-conditioning and electrical systems contained therein. For the purposes of this section, the term includes park trailers, travel trailers, and recreational and other similar vehicles which are placed on site for more than 180 consecutive days.
MANUFACTURED HOME PARK/SUBDIVISION, EXISTINGA parcel or contiguous parcels of land divided into two or more lots for rent or sale for which the construction of facilities for servicing the lot on which the manufactured home is to be affixed, including, at a minimum, the installation of utilities, either final site grading or the pouring of concrete pads, and the construction of streets, is completed before the effective date of the ordinance codified in this section.
NEW CONSTRUCTIONFor the purposes of determining insurance rates, structures for which the start of construction commenced on or after June 15, 1978, and includes any subsequent improvements to such structures. For floodplain management purposes, new construction means structure for which the start of construction commenced on or after the effective date of a floodplain management regulation adopted by a community and includes any subsequent improvements to such structure.
RECREATIONAL VEHICLEA vehicle which is built on a single chassis, is 400 square feet or less when measured at the largest horizontal projection, is designed to be self-propelled or permanently towable by a light-duty truck, and which is designed not for use as a permanent dwelling but as temporary living quarters for recreational camping, travel, or seasonal use.
SHALLOW FLOODING AREAA special flood hazard area with base flood depths from one to three feet where a clearly defined channel does not exist, where the path of flooding is unpredictable and indeterminate, and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow.
START OF CONSTRUCTIONThe date the building permit was issued, provided that the actual start of construction, repair, reconstruction, rehabilitation, addition, placement, substantial improvement or other improvement was within 180 days of the permit date. The actual start means either the first placement of permanent construction of a structure on a site, such as the pouring of slabs or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation on the property of accessory buildings, such as garages or sheds not occupied as dwelling units or not part of the main structure. For a substantial improvement, the actual start of the construction means the first alteration of any wall, ceiling, floor, or other structural part of a building, whether or not that alteration affects the external dimensions of the building.
SUBSTANTIAL DAMAGEDamage of any origin sustained by a structure whereby the cost of restoring the structure to its before-damaged condition would equal or exceed 50% of the market value of the structure before the damage occurred.
SUBSTANTIAL IMPROVEMENTAny reconstruction, rehabilitation, addition or other improvement of a structure, the cost of which equals or exceeds 50% of the market value of the structure before the start of construction of the improvement. This term includes structures which have incurred substantial damage regardless of the actual repair work performed. The term does not, however, include either:
(1) Any project for improvement of a structure to correct existing violations of state or local health, sanitary or safety code specifications which have been identified by the local code enforcement official and which are the minimum necessary to assure safe living conditions; or
(2) Any alteration of an historic structure, provided that the alteration will not preclude the structure's continued designation as an historic structure.
WATERCOURSEA lake, river, creek, stream, wash, channel, or other topographic feature on or over which waters flow at least periodically. "Watercourse" includes specifically designated areas in which substantial flood damage may occur.