§ 42-4. Definitions.
Unless specifically defined in this section, words or phrases used in this chapter shall be interpreted so as to give them the meaning they have in common usage and to give this chapter its most reasonable application. The following words, terms and phrases, when used in this chapter, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:
Accessory use means a use which is incidental and subordinate to the principal use of the parcel of land on which it is located.
Adversely affects means that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will increase the water surface elevation of the base flood more than one foot at any point.
Alluvial fan means a geomorphologic feature characterized by a cone- or fan-shaped deposit of boulders, gravel, and fine sediments that have been eroded from mountain slopes, transported by flood flows, and then deposited on the valley floors, and which is subject to flash flooding, high velocity flows, debris flows, erosion, sediment movement and deposition, and channel migration.
Apex means the point of highest elevation on an alluvial fan, which on undisturbed fans is generally the point where the major stream that formed the fan emerges from the mountain front.
Appeal means a request for a review of the floodplain administrator's interpretation of any section of this chapter or a request for a variance.
Area of shallow flooding means a designated AO or AH zone on the flood insurance rate map (FIRM). The base flood depths range from one to three feet, a clearly defined channel does not exist, the path of flooding is unpredictable and indeterminate, and velocity flow may be evident. Such flooding is characterized by ponding or sheet flow.
Area of special flood hazard. See Special flood hazard area.
Area of special flood-related erosion hazard means the land within a community that is not likely to be subject to severe flood-related erosion losses. The area may be designated as zone E on the flood insurance rate map (FIRM).
Area of special mudslide (i.e., mudflows) hazard means the area subject to severe mudslides (i.e., mudflows). The area is designated as zone M on the flood insurance rate map (FIRM).
Backfill means the placement of fill material within a specified depression, hole or excavation pit below the surrounding adjacent ground level as a means of improving floodwater conveyance or to restore the land to the natural contours existing prior to excavation.
Base flood means the flood having a one-percent chance of being equaled or exceeded in any given year; also called the 100-year flood.
Basement means any area of the building having its floor subgrade (below ground level) on all sides.
Building. See Structure.
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 flood hazard boundary map or flood insurance rate map 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.
Development means any manmade 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.
Encroachment means the advance or infringement of uses, plant growth, fill, excavation, buildings, permanent structures or development into a floodplain that may impede or alter the flow capacity of a floodplain.
Erosion means the process of the gradual wearing away of land masses. This peril is not per se covered under the National Flood Insurance Program.
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.
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 manufactured 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.
Fill means the placement of fill material at a specified location to bring the ground surface up to a desired elevation.
Fill material can be natural sand, dirt, soil or rock. For the purposes of floodplain management, fill material may include concrete, cement, soil cement, brick or similar material as approved on a case-by-case basis.
Flood, flooding and floodwater mean:
(1)
A general and temporary condition of partial or complete inundation of normally dry land areas from:
a.
The overflow of inland or tidal waters;
b.
The unusual and rapid accumulation or runoff of surface waters from any source; and/or
c.
Mudslides (i.e., mudflows) which are proximately caused by flooding, as defined in subsection (2) of this definition, and are akin to a river of liquid and flowing mud on the surfaces of normally dry land areas, as which earth is carried by a current of water and deposited along the path of the current; and
(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 flash flood or an abnormal tidal surge, or by some similarly unusual and unforeseeable event which results in flooding as defined in subsection (1) of this definition.
Flood elevation determination means a determination by the 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 (FHBM) means the official map on which the Federal Emergency Management Agency or Federal Insurance Administration has delineated the areas of flood hazards.
Flood insurance rate map (FIRM) means the official map on which the Federal Emergency Management Agency or Federal Insurance Administration has delineated both the areas of special flood hazards and the risk premium zones applicable to the community.
Flood insurance study means the official report provided by the Federal Insurance Administration that includes flood profiles, the flood insurance rate map, the flood boundary and floodway map, and the water surface elevation of the base flood.
Floodplain and floodprone area mean any land area susceptible to being inundated by water from any source. See the definition of Flood.
Floodplain administrator means the individual appointed to administer and enforce the floodplain management regulations.
Floodplain 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 floodplain management regulations.
Floodplain management regulations means zoning ordinances, subdivision regulations, building codes, health regulations and special purpose ordinances such as floodplain management regulations.
Floodproofing means any combination of structural and nonstructural additions, changes, or adjustments to structures that reduce or eliminate flood damage to real estate or improved real property, water and sanitary facilities, structures, and their contents.
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 to conform to sound engineering standards.
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 and flood-related erosion-prone area mean 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 floodplain management regulations.
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 one foot; also referred to as "regulatory floodway."
Floodway encroachment lines means the lines marking the limits of floodways on federal, state, and local floodplain maps.
Floodway fringe means the area of a floodplain on either side of the designated floodway where encroachment may be permitted.
Fraud and victimization, related to sections 42-23—42-25, means that the variance granted must not cause fraud on or victimization of the public. In examining this requirement, the variance board will consider the fact that every newly constructed building adds to government responsibilities and remains a part of the community for 50 to 100 years. Buildings that are permitted to be constructed below the base flood elevation are subject during all those years to increased risk of damage from floods, while future owners of the property and the community as a whole are subject to all the costs, inconvenience, danger, and suffering that those increased flood damages bring. In addition, future owners may purchase the property, unaware that it is subject to potential flood damage, and can be insured only at very high flood insurance rates.
Freeboard means 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.
Functionally dependent use means a use that 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 shipbuilding and ship repair facilities, but does not include longterm storage or related manufacturing facilities.
Hardship, related to sections 42-23—42-25, means the hardship that would result from a failure to grant the requested variance. The variance board requires that the variance be exceptional, unusual, and peculiar to the property involved. Mere economic or financial hardship alone is not exceptional. Inconvenience, aesthetic considerations, physical handicaps, personal preferences, or the disapproval of one's neighbors likewise cannot, as a rule, qualify as exceptional hardships. All of these problems can be resolved through other means, without granting a variance. This is so even if the alternative means are more expensive or complicated than building with a variance, or if they require the property owner to put the parcel to a different use than originally intended, or to build elsewhere.
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:
(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 requirements 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 registered historic district;
(3)
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
(4)
Individually listed on a local inventory of historic places in communities with historic preservation programs that have been certified either:
a.
By an approved state program as determined by the Secretary of the Interior; or
b.
By the Secretary of the Interior directly in states with approved programs.
Landfill means a permitted location for the disposal, placement or dumping of garbage, trash, debris, junk, or waste material.
Levee means a manmade 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 that consists of a levee 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 any 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 this chapter.
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 Flood Insurance Administration of the Federal Emergency Management 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.
Minimum necessary, related to sections 42-23—42-25, means the minimum necessary to afford relief to the applicant of a variance with a minimum deviation from the requirements of this chapter. For variances to an elevation requirement, this means the variance board need not grant permission for the applicant to build at grade, for example, or even to whatever elevation the applicant proposes, but only that level the board believes will both provide relief and preserve the integrity of the local ordinance.
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.
Mudslide-prone area (i.e., mudflow-prone) means an area with land surfaces and slopes of unconsolidated material where the history, geology, and climate indicate a potential for mudflow.
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.
Obstruction includes but is not limited to any dam, wall, wharf, embankment, levee, dike, pile, abutment, protection, excavation, channelization, bridge, conduit, culvert, building, wire, fence, rock, gravel, refuse, fill, structure, vegetation or other material in, along, across or projecting into any watercourse which may alter, impede, retard or change the direction and/or velocity of the flow of water, or, due to its location, its propensity to snare or collect debris carried by the flow of water or its likelihood of being carried downstream.
One-hundred year flood means a flood which has a one-percent annual probability of being equaled or exceeded. It is identical to the "base flood," which will be the term used throughout this chapter.
Principal structure means a structure used for the principal use of the property as distinguished from an accessory use.
Public safety and nuisances, related to sections 42-23 through 42-25, mean the granting of a variance must not result in additional threats to public safety or create nuisances. This chapter is intended to help protect the health, safety, well-being, and property of the local citizens. This is a long-range community effort made up of a combination of approaches such as adequate drainage systems, warning and evacuation plans, and keeping new property above the flood levels. These longterm goals can only be met if exceptions to the requirements of this chapter are kept to a bare minimum.
Recreational vehicle means a vehicle that is:
(1)
Built on a single chassis;
(2)
Four hundred square feet or fewer when measured at the largest horizontal projection;
(3)
Designed to be self-propelled or permanently towable by a light-duty truck; and
(4)
Designed primarily not for use as a permanent dwelling but as temporary living quarters for recreational, camping, travel, or seasonal use.
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.
Riverine means relating to, formed by, or resembling a river, including tributaries; stream; brook; etc.
Sheet flow area. See Area of shallow flooding.
Special flood hazard area (SFHA) means an area having special flood or flood-related erosion hazards, and shown on an FHBM or FIRM as zone A, AO, A1—A30, AE, A99, or AH.
Start of construction includes substantial improvement and other proposed new development 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 from the date of the permit. 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.
Structure means a walled and roofed building, including a gas or liquid storage tank, that is principally above ground, as well as a manufactured home.
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 proposed new development 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 that 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 or 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 ensure 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.
Variance means a grant of relief from the requirements of this chapter that permits construction in a manner that would otherwise be prohibited by this chapter.
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 floodplain of coastal or riverine areas.
Watercourse means a lake, river, creek, stream, wash, arroyo, channel or other topographic feature on, or over which, waters flow at least periodically. The term "watercourse" includes specifically designated areas in which substantial flood damage may occur.
(Ord. No. 99-11, § 3(16A.44.050), 6-16-1999)
Cross reference
Definitions generally, § 1-2.