Section 20-3199. DEFINITIONS


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    3199.1When used in this chapter, the following words and phrases shall have the meaning ascribed:

     

    Alteration of a Watercoursean alteration of a watercourse includes, but is not limited to, any dam, impoundment, channel relocation, change in channel alignment, channelization, or change in cross-sectional area or capacity, which may alter, impede, retard or change the direction and/or velocity of the riverine flow of water during conditions of the base flood.

     

    Base Floodthe flood having a one percent (1%) chance of being equaled or exceeded in any given year, also known as “the one-hundred (100) year flood.”

     

    Base Flood Elevationthe elevation of the base flood, including wave height, relative to the National Geodetic Vertical Datum (NGVD), North America Vertical Datum (NAVD) or other datum specified on the Flood Insurance Rate Map (FIRM).

     

    Basementthe portion of a building having its floor subgrade (below ground level) on all sides.

     

    Code Officialthe officer or other designated authority charged with the administration and enforcement of the building codes, or a duly authorized representative, as designated by 12 DCMR A 103.1.

     

    Constructionthe construction, reconstruction, renovation, repair, extension, expansion, alteration, or relocation of a building structure.

     

    DCRA – the Department of Consumer and Regulatory Affairs.

     

    DDOE – the District Department of the Environment, also referred to as “Department.”

     

    Developmentany manmade change to improved or unimproved real estate, including but not limited to: buildings or other structures, streets and other paving, utilities, filling, grading, excavation, mining, dredging, drilling operations, storage of equipment or materials, and the subdivision of land.

     

    Department – the District Department of the Environment, also referred to as “DDOE.”

     

    Dry Floodproofing – a combination of design modifications that result in a building or structure, including the attendant utility and sanitary facilities, being water tight with walls substantially impermeable to the passage of water and with structural components have the capacity to resist loads as identified in ASCE 7 (see floodproofing).

     

    Elevation Certificatea certificate used to certify building and grade and other building information, and elevations to provide elevation information necessary to ensure compliance with this chapter, to determine the proper insurance premium rate, and to support a request for a Letter of Map Amendment (LOMA) or Letter of Map Revision based on Fill (LOMR-F).

     

    Encroachmentthe advancement or infringement of uses, fill, excavation, buildings, permanent structures or other development into a special flood hazard area which may impede or alter the flow capacity of a floodplain.

     

    FEMAthe Federal Emergency Management Agency.

     

    Flood or Floodinga general and temporary condition of partial or complete inundation of normally dry land from:

     

    (a) The overflow of inland or tidal waters; or

     

    (b) The unusual and rapid accumulation or runoff of surface waters from any source.

     

    Flood Insurance Rate Map (FIRM) – 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.

     

    Flood Insurance Study (FIS) – an official report including a Flood Insurance Rate Map by the Federal Insurance Administrator evaluating flood hazards and containing flood profiles and water surface elevations of the base flood.

     

    Floodplaina relatively flat or low land area which is subject to partial or complete inundation from an adjoining or nearby stream, river or watercourse; or any area subject to the usual and rapid accumulation of surface waters from any source.

     

    Floodplain Administratorthe official or office charged with the administration and enforcement of this Chapter, for these purposes, DDOE.

     

    Floodproofingany combination of structural and non-structural additions, changes, adjustments to structures which reduce or eliminate flood damage to real estate or improved real property, water and sanitary facilities, structures, and their contents.

     

    Floodwaythe channel or 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.

     

    Freeboard – a 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 wave action, bridge openings, and the hydrological effect of urbanization of the watershed.

     

    Historic Structureany structure that is:

     

    (a) Individually listed in the National Register of Historic Places (a listing maintained by the U.S. 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.

     

    Land Disturbing Activity  any earth movement or land change which may result in soil erosion from water or wind and the movement of sediments in the District of Columbia, including, but not limited to, stripping, grading, excavating, transporting and filling of land, construction or demolition of buildings or structures.

     

    Lowest Floorthe lowest floor of the lowest enclosed area (including basement). An unfinished or flood resistant enclosure, used solely for parking of vehicles, building access, or storage, in an area other than basement, 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 this chapter.

     

    Manufactured Homea structure, transportable in one (1) or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when connected to the required utilities. For flood plain management purposes, the term "manufactured home" also includes park trailers, travel trailers, and other similar vehicles placed on a site for greater than one hundred and eighty (180) consecutive days.

     

    Market Valuethe price at which a property will change hands between a willing buyer and a willing seller, neither party being under compulsion to buy or sell and both having reasonable knowledge of relevant facts.

     

    National Flood Insurance Program (NFIP)a Federal program enabling property owners in participating communities to purchase insurance protection against losses from flooding. Participation in the NFIP is based on an agreement between local communities and the Federal Government that states if a community will adopt and enforce a floodplain management ordinance to reduce future flood risks to new construction and development in special flood hazard areas, the Federal Government will make flood insurance available within the community as a financial protection against flood losses.

     

    New Construction/Datefor floodplain management purposes, structures for which the start of construction commenced on or after the effective date of the initial FIRM (i.e., November 15, 1985) and includes any subsequent improvements to such structures.

     

    Obstructionany wall, dam, wharf, embankment levee, dike, pile abutment, projection, excavation, channel, rectification, culvert, building, fence, stockpile, refuse, fill, structure, or matter in, along, across or projecting into any channel, watercourse, or flood-prone area, which may impede, retard, or change the direction of the flow of water either by itself or by catching or collecting debris carried by such water or is placed where the flow of the water might carry the same downstream to the damage of life and property.

     

    Recreational Vehicle  a vehicle that is:

     

    (a) Built on a single chassis;

     

    (b) Having total outside dimensions not exceeding four hundred square feet (400 ft.2) 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.

     

     

    Regulatory Flood Elevationthe base flood elevation plus a freeboard safety factor of one and one-half feet (1-1/2 ft.).

     

    Special Flood Hazard Area (SFHA) – the land in the floodplain within the community subject to a 1-percent (1%) chance or greater chance of flooding in any given year. The area may be designated in the FIRM as Zone A, A1-30, AE, A99, AR/A1-30, AR/AE, AR/AO, AR/AH, or AR/A.

     

    Zone Aan area subject to inundation by the one (1)-percent (1%) chance or greater chance of flooding in any given year. Because detailed hydraulic analyses have not been performed, no base flood elevation or depths are shown.

     

    Zone AEan area subject to inundation by the one (1)-percent (1%) chance or greater chance of flooding in any given year determined by detailed methods. Base flood elevations are shown within these zones.

     

    Zone X an area identified in the FIRM and FIS as an area of moderate or minimal hazard from the principal source of flood in the area.

     

    Start of Constructionthe date of permit issuance for new construction and substantial improvements to existing structures, provided the actual start of construction, repair, reconstruction, rehabilitation, addition, placement or other improvement is within one hundred eighty (180) days after the date of issuance. The actual start of construction means the first placement of permanent construction of a building (including a manufactured home) on a site, such as the pouring of a slab or footings, installation of pilings or construction of columns.

     

    Structurefor 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 or recreational vehicle that is on-site for more than one hundred eighty (180) days.

     

    Subdivisionthe division or redivision of a lot, tract, or parcel of land by any means into two (2) or more lots, tracts, parcels or other divisions of land including changes in existing lots lines.

     

    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 fifty percent (50%) of the market value of the structure before the damage occurred.

     

    Substantial Improvementany repair, reconstruction, rehabilitation, addition, or improvement of a building or structure, the cost of which equals or exceeds fifty percent (50%) of the market value of the structure before the start of construction. If the structure has sustained substantial damage, any repairs are considered substantial improvement regardless of the actual repair work performed. The term does not, however, include either:

     

    (a) Any project for improvement of a building required to correct existing health, sanitary or safety code violations identified by the building official and which are the minimum necessary to assure safe living conditions; or

     

    (b) Any alteration of a historic structure provided that the alteration will not preclude the structure’s continued designation as a historic structure.

     

    Violationthe failure of new construction or development to be fully compliant with requirements of this Chapter, the Construction Codes (DCMR Title 12), the District’s Water Quality and Pollution Control Regulations (20 DCMR 500 et. seq.). A structure or other development without the elevation certificate, other certifications, or other evidence of compliance required in this chapter is presumed to be in violation until such time as that documentation is provided.

     

    Wet Floodproofing – floodproofing method that relies on the use of flood-damage-resistant materials and construction techniques to minimize flood damages to areas below the base flood elevation of a structure intentionally allowed to flood (see floodproofing).

     

    Zone A – see Special Flood Hazard Area

     

    Zone AE – see Special Flood Hazard Area

     

    Zone X – see Special Flood Hazard Area

     

authority

The Acting Director of the District Department of the Environment (the Department, or DDOE), in accordance with the authority set forth in the District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code § 8-151.01 et seq.), the Water Pollution Control Act of 1984, as amended, effective March 16, 1985 (D.C. Law 5-188; D.C. Official Code § 8-103.01, et seq.), the Soil Erosion and Sedimentation Control Act of 1977 (D.C. Law 2-23; codified at Chapter 21 of District of Columbia Municipal Regulations (DCMR), §§ 500 through 507), the District of Columbia Applications Insurance Implementation Act, (District of Columbia Law 1-64, D.C. Official Code § 6-501, et seq.), and Mayor’s Order 2006-61, dated June 14, 2006.

source

Final Rulemaking published at 32 DCR 6547, 6562 (November 15, 1985); as amended by Final Rulemaking published at 35 DCR 962, 963 (February 12, 1988); as amended by Notice of Final Rulemaking published at 57 DCR 10782 (November 19, 2010).