§ 59.1 Definitions. As used in this subchapter— *Act* means the statutes authorizing the National Flood Insurance Program that are incorporated in 42 U.S.C. 4001- *et seq.*
*Actuarial rates* —see *risk premium rates.*
*Administrator* means the Administrator of the Federal Emergency Management Agency.
*Agency* means the Federal Emergency Management Agency, Washington DC.
*Alluvial fan flooding* means flooding occurring on the surface of an alluvial fan or similar landform which originates at the apex and is characterized by high-velocity flows; active processes of erosion, sediment transport, and deposition; and, unpredictable flow paths.
*Apex* means a point on an alluvial fan or similar landform below which the flow path of the major stream that formed the fan becomes unpredictable and alluvial fan flooding can occur.
*Applicant* means a community which indicates a desire to participate in the Program.
*Appurtenant structure* means a structure which is on the same parcel of property as the principal structure to be insured and the use of which is incidental to the use of the principal structure.
*Area of future-conditions flood hazard* means the land area that would be inundated by the 1-percent-annual-chance (100-year) flood based on future-conditions hydrology.
*Area of shallow flooding* means a designated AO, AH, AR/AO, AR/AH, or VO zone on a community's Flood Insurance Rate Map (FIRM) with a 1 percent or greater annual chance of flooding to an average depth of 1 to 3 feet where a clearly defined channel does not exist, where the path of flooding is unpredictable, and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow.
*Area of special flood-related erosion hazard* is the land within a community which is most likely to be subject to severe flood-related erosion losses. The area may be designated as Zone E on the Flood Hazard Boundary Map (FHBM). After the detailed evaluation of the special flood-related erosion hazard area in preparation for publication of the FIRM, Zone E may be further refined.
*Area of special flood hazard* is the land in the flood plain within a community subject to a 1 percent or greater chance of flooding in any given year. The area may be designated as Zone A on the FHBM. After detailed ratemaking has been completed in preparation for publication of the flood insurance rate map, Zone A usually is refined into Zones A, AO, AH, A1-30, AE, A99, AR, AR/A1-30, AR/AE, AR/AO, AR/AH, AR/A, VO, or V1-30, VE, or V. For purposes of these regulations, the term “special flood hazard area” is synonymous in meaning with the phrase “area of special flood hazard”.
*Area of special mudslide* (*i.e., mudflow*) *hazard* is the land within a community most likely to be subject to severe mudslides (i.e., mudflows). The area may be designated as Zone M on the FHBM. After the detailed evaluation of the special mudslide (i.e., mudflow) hazard area in preparation for publication of the FIRM, Zone M may be further refined.
*Base flood* means the flood having a one percent chance of being equalled or exceeded in any given year.
*Basement”* means any area of the building having its floor subgrade (below ground level) on all sides.
*Breakaway wall* means a wall that is not part of the structural support of the building and is intended through its design and construction to collapse under specific lateral loading forces, without causing damage to the elevated portion of the building or supporting foundation system.
*Building* —see *structure.*
*Chargeable rates* mean the rates established by the Federal Insurance Administrator pursuant to section 1308 of the Act for first layer limits of flood insurance on existing structures.
*Chief Executive Officer* of the community (*CEO*) means the official of the community who is charged with the authority to implement and administer laws, ordinances and regulations for that community.
*Coastal high hazard area* means an area of special flood hazard extending from offshore to the inland limit of a primary frontal dune along an open coast and any other area subject to high velocity wave action from storms or seismic sources.
*Community* means any State or area or political subdivision thereof, or any Indian tribe or authorized tribal organization, or Alaska Native village or authorized native organization, which has authority to adopt and enforce flood plain management regulations for the areas within its jurisdiction.
*Condominium building* means a type of building in the form of ownership in which each unit owner has an undivided interest in common elements of the building.
*Contents coverage* is the insurance on personal property within an enclosed structure, including the cost of debris removal, and the reasonable cost of removal of contents to minimize damage. Personal property may be household goods usual or incidental to residential occupancy, or merchandise, furniture, fixtures, machinery, equipment and supplies usual to other than residential occupancies.
*Criteria* means the comprehensive criteria for land management and use for flood-prone areas developed under 42 U.S.C. 4102 for the purposes set forth in part 60 of this subchapter.
*Critical feature* means an integral and readily identifiable part of a flood protection system, without which the flood protection provided by the entire system would be compromised.
*Curvilinear Line* means the border on either a FHBM or FIRM that delineates the special flood, mudslide (i.e., mudflow) and/or flood-related erosion hazard areas and consists of a curved or contour line that follows the topography.
*Deductible* means the amount of an insured loss that is the responsibility of the insured and that is incurred before any amounts are paid for the insured loss under the insurance policy.
*Developed area* means an area of a community that is: ( a ) A primarily urbanized, built-up area that is a minimum of 20 contiguous acres, has basic urban infrastructure, including roads, utilities, communications, and public facilities, to sustain industrial, residential, and commercial activities, and ( 1 ) Within which 75 percent or more of the parcels, tracts, or lots contain commercial, industrial, or residential structures or uses; or
( 2 ) Is a single parcel, tract, or lot in which 75 percent of the area contains existing commercial or industrial structures or uses; or
( 3 ) Is a subdivision developed at a density of at least two residential structures per acre within which 75 percent or more of the lots contain existing residential structures at the time the designation is adopted.
( b ) Undeveloped parcels, tracts, or lots, the combination of which is less than 20 acres and contiguous on at least 3 sides to areas meeting the criteria of paragraph (a) at the time the designation is adopted.
( c ) A subdivision that is a minimum of 20 contiguous acres that has obtained all necessary government approvals, provided that the actual “start of construction” of structures has occurred on at least 10 percent of the lots or remaining lots of a subdivision or 10 percent of the maximum building coverage or remaining building coverage allowed for a single lot subdivision at the time the designation is adopted and construction of structures is underway. Residential subdivisions must meet the density criteria in paragraph (a)(3).
*Development* means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations or storage of equipment or materials.
Eligible community or participating community means a community for which the Federal Insurance Administrator has authorized the sale of flood insurance under the National Flood Insurance Program..
*Elevated building* means, for insurance purposes, a nonbasement building which has its lowest elevated floor raised above ground level by foundation walls, shear walls, posts, piers, pilings, or columns.
*Emergency program* means the initial phase of a community's participation in the National Flood Insurance Program, as prescribed by Section 1306 of the Act.
*Erosion* means the process of the gradual wearing away of land masses. This peril is not per se covered under the Program.
*Exception* means a waiver from the provisions of part 60 of this subchapter directed to a community which relieves it from the requirements of a rule, regulation, order or other determination made or issued pursuant to the Act.
*Existing construction,* means for the purposes of determining rates, structures for which the “start of construction” commenced before the effective date of the FIRM or before January 1, 1975, for FIRMs effective before that date. “Existing construction” may also be referred to as “existing structures.”
*Existing manufactured home park or subdivision* means a manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including, at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed before the effective date of the floodplain management regulations adopted by a community.
*Existing structures* see *existing construction.*
*Expansion to an existing manufactured home park or subdivision* means the preparation of additional sites by the construction of facilities for servicing the lots on which the manufacturing homes are to be affixed (including the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads).
*Federal agency* means any department, agency, corporation, or other entity or instrumentality of the executive branch of the Federal Government, and includes the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation.
*Federal instrumentality responsible for the supervision, approval, regulation, or insuring of banks, savings and loan associations, or similar institutions* means the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, the Comptroller of the Currency, the Federal Home Loan Bank Board, the Federal Savings and Loan Insurance Corporation, and the National Credit Union Administration.
*Financial assistance* means any form of loan, grant, guaranty, insurance, payment, rebate, subsidy, disaster assistance loan or grant, or any other form of direct or indirect Federal assistance, other than general or special revenue sharing or formula grants made to States.
*Financial assistance for acquisition or construction purposes* means any form of financial assistance which is intended in whole or in part for the acquisition, construction, reconstruction, repair, or improvement of any publicly or privately owned building or mobile home, and for any machinery, equipment, fixtures, and furnishings contained or to be contained therein, and shall include the purchase or subsidization of mortgages or mortgage loans but shall exclude assistance pursuant to the Disaster Relief Act of 1974 other than assistance under such Act in connection with a flood. It includes only financial assistance insurable under the Standard Flood Insurance Policy.
*First-layer coverage* is the maximum amount of structural and contents insurance coverage available under the Emergency Program.
Flood or Flooding means: ( a ) A general and temporary condition of partial or complete inundation of normally dry land areas from: ( 1 ) The overflow of inland or tidal waters.
( 2 ) The unusual and rapid accumulation or runoff of surface waters from any source.
( 3 ) Mudslides (i.e., mudflows) which are proximately caused by flooding as defined in paragraph (a)(2) of this definition and are akin to a river of liquid and flowing mud on the surfaces of normally dry land areas, as when earth is carried by a current of water and deposited along the path of the current.
( b ) 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 flash flood or an abnormal tidal surge, or by some similarly unusual and unforeseeable event which results in flooding as defined in paragraph (a)(1) of this definition.
*Flood elevation determination* means a determination by the Federal Insurance Administrator of the water surface elevations of the base flood, that is, the flood level that has a one percent or greater chance of occurrence in any given year.
*Flood elevation study* means an examination, evaluation and determination of flood hazards and, if appropriate, corresponding water surface elevations, or an examination, evaluation and determination of mudslide (i.e., mudflow) and/or flood-related erosion hazards.
*Flood Hazard Boundary Map* means an official map of a community, issued by the Federal Insurance Administrator, where the boundaries of the flood, mudslide (i.e., mudflow) related erosion areas having special hazards have been designated as Zones A, M, and/or E.
*Flood insurance* means the insurance coverage provided under the Program.
*Flood Insurance Rate Map* (FIRM) means an official map of a community, on which the Federal Insurance Administrator has delineated both the special hazard areas and the risk premium zones applicable to the community. A FIRM that has been made available digitally is called a Digital Flood Insurance Rate Map (DFIRM).
*Flood Insurance Study* see *flood elevation study.*
Flood plain or flood-prone area means any land area susceptible to being inundated by water from any source (see definition of “flooding”).
*Flood plain management* means the operation of an overall program of corrective and preventive measures for reducing flood damage, including but not limited to emergency preparedness plans, flood control works and flood plain management regulations.
*Flood plain management regulations* means zoning ordinances, subdivision regulations, building codes, health regulations, special purpose ordinances (such as a flood plain ordinance, grading ordinance and erosion control ordinance) and other applications of police power. The term describes such state or local regulations, in any combination thereof, which provide standards for the purpose of flood damage prevention and reduction.
*Flood protection system* means those physical structural works for which funds have been authorized, appropriated, and expended and which have been constructed specifically to modify flooding in order to reduce the extent of the area within a community subject to a “special flood hazard” and the extent of the depths of associated flooding. Such a system typically includes hurricane tidal barriers, dams, reservoirs, levees or dikes. These specialized flood modifying works are those constructed in conformance with sound engineering standards.
*Flood proofing* means any combination of structural and non-structural 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.
*Flood-related erosion* means the collapse or subsidence of land along the shore of a lake or other body of water as a result of 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 an abnormal tidal surge, or by some similarly unusual and unforeseeable event which results in flooding.
Flood-related erosion area or flood-related erosion prone area means a land area adjoining the shore of a lake or other body of water, which due to the composition of the shoreline or bank and high water levels or wind-driven currents, is likely to suffer flood-related erosion damage.
*Flood-related erosion area management* means the operation of an overall program of corrective and preventive measures for reducing flood-related erosion damage, including but not limited to emergency preparedness plans, flood-related erosion control works, and flood plain management regulations.
*Floodway* —see *regulatory floodway.*
*Floodway encroachment lines* mean the lines marking the limits of floodways on Federal, State and local flood plain maps.
*Freeboard* means a factor of safety usually expressed in feet above a flood level for purposes of flood plain 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 wave action, bridge openings, and the hydrological effect of urbanization of the watershed.
*Functionally dependent use* means a use which cannot perform its intended purpose unless it is located or carried out in close proximity to water. The term includes only docking facilities, port facilities that are necessary for the loading and unloading of cargo or passengers, and ship building and ship repair facilities, but does not include long-term storage or related manufacturing facilities.
Future-conditions flood hazard area, or future-conditions floodplain —see *Area of future-conditions flood hazard.*
*Future-conditions hydrology* means the flood discharges associated with projected land-use conditions based on a community's zoning maps and/or comprehensive land-use plans and without consideration of projected future construction of flood detention structures or projected future hydraulic modifications within a stream or other waterway, such as bridge and culvert construction, fill, and excavation.
*Highest adjacent grade* means the highest natural elevation of the ground surface prior to construction next to the proposed walls of a structure.
*Historic Structure* means any structure that is: ( a ) Listed individually in the National Register of Historic Places (a listing maintained by the Department of Interior) or preliminarily determined by the Secretary of the Interior as meeting the requirements for individual listing on the National Register;
( b ) 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;
( c ) Individually listed on a state inventory of historic places in states with historic preservation programs which have been approved by the Secretary of the Interior; or
( d ) Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified either: ( 1 ) By an approved state program as determined by the Secretary of the Interior or
( 2 ) Directly by the Secretary of the Interior in states without approved programs.
*Independent scientific body* means a non-Federal technical or scientific organization involved in the study of land use planning, flood plain management, hydrology, geology, geography, or any other related field of study concerned with flooding.
*Insurance adjustment organization* means any organization or person engaged in the business of adjusting loss claims arising under the Standard Flood Insurance Policy.
Insurance company or insurer means any person or organization authorized to engage in the insurance business under the laws of any State.
*Levee* means a man-made structure, usually an earthen embankment, designed and constructed in accordance with sound engineering practices to contain, control, or divert the flow of water so as to provide protection from temporary flooding.
*Levee System* means a flood protection system which consists of a levee, or levees, and associated structures, such as closure and drainage devices, which are constructed and operated in accordance with sound engineering practices.
*Lowest Floor* means the 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 non-elevation design requirements of § 60.3.
*Mangrove stand* means an assemblage of mangrove trees which are mostly low trees noted for a copious development of interlacing adventitious roots above the ground and which contain one or more of the following species: Black mangrove (Avicennia Nitida); red mangrove (Rhizophora Mangle); white mangrove (Languncularia Racemosa); and buttonwood (Conocarpus Erecta).
*Manufactured home* means a structure, transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when attached to the required utilities. The term “manufactured home” does not include a “recreational vehicle”.
*Manufactured home park or subdivision”* means a parcel (or contiguous parcels) of land divided into two or more manufactured home lots for rent or sale.
*Map* means the Flood Hazard Boundary Map (FHBM) or the Flood Insurance Rate Map (FIRM) for a community issued by the Agency.
*Mean sea level* means, for purposes of the National Flood Insurance Program, the National Geodetic Vertical Datum (NGVD) of 1929 or other datum, to which base flood elevations shown on a community's Flood Insurance Rate Map are referenced.
*Mixed use building* means a building that has both residential and non-residential uses.
*Mudslide (i.e., mudflow)* describes a condition where there is a river, flow or inundation of liquid mud down a hillside usually as a result of a dual condition of loss of brush cover, and the subsequent accumulation of water on the ground preceded by a period of unusually heavy or sustained rain. A mudslide (i.e., mudflow) may occur as a distinct phenomenon while a landslide is in progress, and will be recognized as such by the Administrator only if the mudflow, and not the landslide, is the proximate cause of damage that occurs.
*Mudslide* (*i.e., mudflow*) *area management* means the operation of an overall program of corrective and preventive measures for reducing mudslide (i.e., mudflow) damage, including but not limited to emergency preparedness plans, mudslide control works, and flood plain management regulations.
*Mudslide* (*i.e., mudflow*) *prone area* means an area with land surfaces and slopes of unconsolidated material where the history, geology and climate indicate a potential for mudflow.
*Multifamily building* means an other residential building that is not a condominium building.
*New construction* means, for the purposes of determining insurance rates, structures for which the “start of construction” commenced on or after the effective date of an initial FIRM or after December 31, 1974, whichever is later, and includes any subsequent improvements to such structures. For floodplain management purposes, *new construction* means structures 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 structures.
*New manufactured home park or subdivision* means a manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed (including at a minimum, the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads) is completed on or after the effective date of floodplain management regulations adopted by a community.
*Non-residential building* means a commercial or mixed-use building where the primary use is commercial or non-habitational.
*Non-residential property* means either a non-residential building, the contents within a non-residential building, or both.
*100-year flood* see *base flood.*
*Other residential building* means a residential building that is designed for use as a residential space for 5 or more families or a mixed use building in which the total floor area devoted to non-residential uses is less than 25 percent of the total floor area within the building.
*Other residential property* means either an other residential building, the contents within an other residential building, or both.
*Participating community,* also known as an *eligible community,* means a community in which the Administrator has authorized the sale of flood insurance.
*Person* includes any individual or group of individuals, corporation, partnership, association, or any other entity, including State and local governments and agencies.
*Policy* means the Standard Flood Insurance Policy.
*Premium* means the total premium payable by the insured for the coverage or coverages provided under the policy. The calculation of the premium may be based upon either chargeable rates or risk premium rates, or a combination of both.
*Primary frontal dune* means a continuous or nearly continuous mound or ridge of sand with relatively steep seaward and landward slopes immediately landward and adjacent to the beach and subject to erosion and overtopping from high tides and waves during major coastal storms. The inland limit of the primary frontal dune occurs at the point where there is a distinct change from a relatively steep slope to a relatively mild slope.
*Principally above ground* means that at least 51 percent of the actual cash value of the structure, less land value, is above ground.
*Program* means the National Flood Insurance Program authorized by 42 U.S.C. 4001 through 4128.
*Program deficiency* means a defect in a community's flood plain management regulations or administrative procedures that impairs effective implementation of those flood plain management regulations or of the standards in § 60.3, § 60.4, § 60.5, or § 60.6.
*Project cost* means the total financial cost of a flood protection system (including design, land acquisition, construction, fees, overhead, and profits), unless the Federal Insurance Administrator determines a given “cost” not to be a part of such project cost.
*Recreational vehicle* means a vehicle which is: ( a ) Built on a single chassis;
( b ) 400 square feet or less when measured at the largest horizontal projection;
( c ) Designed to be self-propelled or permanently towable by a light duty truck; and
( d ) Designed primarily not for use as a permanent dwelling but as temporary living quarters for recreational, camping, travel, or seasonal use.
*Reference feature* is the receding edge of a bluff or eroding frontal dune, or if such a feature is not present, the normal high-water line or the seaward line of permanent vegetation if a high-water line cannot be identified.
*Regular Program* means the Program authorized by the Act under which risk premium rates are required for the first half of available coverage (also known as “first layer” coverage) for all new construction and substantial improvements started on or after the effective date of the FIRM, or after December 31, 1974, for FIRM's effective on or before that date. All buildings, the construction of which started before the effective date of the FIRM, or before January 1, 1975, for FIRMs effective before that date, are eligible for first layer coverage at either subsidized rates or risk premium rates, whichever are lower. Regardless of date of construction, risk premium rates are always required for the second layer coverage and such coverage is offered only after the Administrator has completed a risk study for the community.
*Regulatory floodway* means the 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 a designated height.
*Remedy a violation* means to bring the structure or other development into compliance with State or local flood plain management regulations, or, if this is not possible, to reduce the impacts of its noncompliance. Ways that impacts may be reduced include protecting the structure or other affected development from flood damages, implementing the enforcement provisions of the ordinance or otherwise deterring future similar violations, or reducing Federal financial exposure with regard to the structure or other development.
*Residential building* means a non-commercial building designed for habitation by one or more families or a mixed use building that qualifies as a single-family, two-to-four family, or other residential building.
*Residential property* means either a residential building or the contents within a residential building, or both.
*Risk premium rates* means those rates established by the Federal Insurance Administrator pursuant to individual community studies and investigations which are undertaken to provide flood insurance in accordance with section 1307 of the Act and the accepted actuarial principles. “Risk premium rates” include provisions for operating costs and allowances.
*Riverine* means relating to, formed by, or resembling a river (including tributaries), stream, brook, etc.
*Sand dunes* mean naturally occurring accumulations of sand in ridges or mounds landward of the beach.
*Scientifically incorrect.* The methodology(ies) and/or assumptions which have been utilized are inappropriate for the physical processes being evaluated or are otherwise erroneous.
*Second layer coverage* means an additional limit of coverage equal to the amounts made available under the Emergency Program, and made available under the Regular Program.
*Servicing company* means a corporation, partnership, association, or any other organized entity which contracts with the Federal Insurance Administration to service insurance policies under the National Flood Insurance Program for a particular area.
*Sheet flow area* —see *area of shallow flooding.*
*Single-family dwelling* means either ( a ) a residential single-family building in which the total floor area devoted to non-residential uses is less than 50 percent of the building's total floor area, or
( b ) a single-family residential unit within a two-to-four family building, other-residential building, business, or non-residential building, in which commercial uses within the unit are limited to less than 50 percent of the unit's total floor area.
*60-year setback* means a distance equal to 60 times the average annual long term recession rate at a site, measured from the reference feature.
*Special flood hazard area* —see “area of special flood hazard”.
*Special hazard area* means an area having special flood, mudslide (i.e., mudflow), or flood-related erosion hazards, and shown on an FHBM or FIRM as Zone A, AO, A1-30, AE, AR, AR/A1-30, AR/AE, AR/AO, AR/AH, AR/A, A99, AH, VO, V1-30, VE, V, M, or E.
*Standard Flood Insurance Policy* means the flood insurance policy issued by the Federal Insurance Administrator or an insurer pursuant to an arrangement with the Federal Insurance Administrator pursuant to Federal statutes and regulations.
*Start of Construction* (for other than new construction or substantial improvements under the Coastal Barrier Resources Act (Pub. L. 97-348)), includes substantial improvement, and means the date the building permit was issued, provided the actual start of construction, repair, reconstruction, rehabilitation, addition placement, 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 slab or footings, the installation of piles, the construction of columns, or any work beyond the stage of excavation; or the placement of a manufactured home on a foundation. Permanent construction does not include land preparation, such as clearing, grading and filling; nor does it include the installation of streets and/or walkways; nor does it include excavation for a basement, footings, piers, or foundations or the erection of temporary forms; 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 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.
*State* means any State of the United States, the District of Columbia, Puerto Rico, the Virgin Islands, Guam, American Samoa, and the Commonwealth of the Northern Mariana Islands.
*State Coordinating Agency* means the agency of the state government (or other office designated by the Governor of the state or by state statute) that, at the request of the Federal Insurance Administrator, assists in the implementation of the National Flood Insurance Program in that state.
*Storm cellar* means a space below grade used to accommodate occupants of the structure and emergency supplies as a means of temporary shelter against severe tornado or similar wind storm activity.
*Structure* means, for floodplain management purposes, a walled and roofed building, including a gas or liquid storage tank, that is principally above ground, as well as a manufactured home. *Structure,* for insurance purposes, means: ( 1 ) A building with two or more outside rigid walls and a fully secured roof, that is affixed to a permanent site;
( 2 ) A manufactured home (“a manufactured home,” also known as a mobile home, is a structure: built on a permanent chassis, transported to its site in one or more sections, and affixed to a permanent foundation); or
( 3 ) A travel trailer without wheels, built on a chassis and affixed to a permanent foundation, that is regulated under the community's floodplain management and building ordinances or laws. For the latter purpose, “structure” does not mean a recreational vehicle or a park trailer or other similar vehicle, except as described in paragraph (3) of this definition, or a gas or liquid storage tank.
*Subsidized rates* mean the rates established by the Federal Insurance Administrator involving in the aggregate a subsidization by the Federal Government.
*Substantial damage* means damage of any origin sustained by a structure whereby the cost of restoring the structure to its before damaged condition would equal or exceed 50 percent of the market value of the structure before the damage occurred.
*Substantial improvement* means any reconstruction, rehabilitation, addition, or other improvement of a structure, the cost of which equals or exceeds 50 percent 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 a “historic structure”, provided that the alteration will not preclude the structure's continued designation as a “historic structure”.
*30-year setback* means a distance equal to 30 times the average annual long term recession rate at a site, measured from the reference feature.
*Technically incorrect.* The methodology(ies) utilized has been erroneously applied due to mathematical or measurement error, changed physical conditions, or insufficient quantity or quality of input data.
*Two-to-four family building* means a residential building, including an apartment building, containing two-to-four residential spaces and in which commercial uses are limited to less than 25 percent of the building's total floor area.
*V Zone* —see “coastal high hazard area.”
*Variance* means a grant of relief by a community from the terms of a flood plain management regulation.
*Violation* means the failure of a structure or other development to be fully compliant with the community's flood plain management regulations. A structure or other development without the elevation certificate, other certifications, or other evidence of compliance required in § 60.3(b)(5), (c)(4), (c)(10), (d)(3), (e)(2), (e)(4), or (e)(5) is presumed to be in violation until such time as that documentation is provided.
*Water surface elevation* means the height, in relation to the National Geodetic Vertical Datum (NGVD) of 1929, (or other datum, where specified) of floods of various magnitudes and frequencies in the flood plains of coastal or riverine areas.
*Zone of imminent collapse* means an area subject to erosion adjacent to the shoreline of an ocean, bay, or lake and within a distance equal to 10 feet plus 5 times the average annual long-term erosion rate for the site, measured from the reference feature.
[41 FR 46968, Oct. 26, 1976] Editorial Note
Editorial Note: For Federal Register citations affecting § 59.1, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at *www.govinfo.gov .*