Flood frequency definition

Flood frequency means the probability of a flood occurrence which is determined from statistical analyses. The frequency of a particular flood event is usually expressed as occurring, on the average once in a specified number of years or as a percent (%) chance of occurring in any given year.
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Flood frequency means the frequency for which it is expected that a specific flood stage or discharge may be equaled or exceeded.
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Flood frequency means the average frequency, statistically determined, for which it is expected that a specific flood stage or discharge may be equaled or exceeded. This frequency is usually expressed as having a probability of occurring, on the average, once within a specified number of years.
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Examples of Flood frequency in a sentence

  • Flood frequency, calculated as the number of flood events in a year, was unrelated to survival of all species combined.

  • Neither the Company nor any ERISA Affiliate contributes to, maintains, or has any liability or obligation in respect of, a Multiemployer Plan.

  • Flood frequency and timing, although less important in this study, have been shown to be important in other studies (Glenz et al.

  • Flood frequency – the probable frequency that a streamflow will recur based on historical flow records.

  • Flood frequency estimation in the Czech Republic is carried out mainly by Czech Hydrometeorological Institute (CHMI).

  • Q = Rate of runoff (cfs)K = Coefficient of imperviousness R = Flood frequency ratioA = Drainage basin area (mi²) x = Area exponentT = Lag time (hours) 6-0804.2 Coefficient of Imperviousness (K) is obtained by K = 1.00 + 0.015(I) where I is the percentage of basin area covered with impervious surface.

  • Flood frequency analyses (FFAs) are needed for flood risk management.

  • Flood frequency analysis shall follow applicable, current, published guidelines and procedures, such as Guidelines For Determining Flood Flow Frequency (ACWI Bulletin 17C, USGS, 2018).

  • Flood frequency and volume is affected by upland watershed conditions, which are currently good within the project area, but could be altered by catastrophic fire.

  • Flood frequency and severity has increased, and broader segments of the population are likely to be affected by them.


More Definitions of Flood frequency

Flood frequency means a statistical expression of the average time period between floods equaling or exceeding a given magnitude.
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Flood frequency means a frequency normally expressed as a period of years, based upon a percent chance of occurrence in any given year from statistical analysis, during which a flood of a stated magnitude may be expected to be equaled or exceeded, as in the two-year flood frequency has a 50% chance of occurrence in any given year and the 100-year flood frequency has a 1% chance of occurrence in any given year;
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Flood frequency means the average frequency, statistically determined, for which it is expected that a specific flood stage or discharge may be equaled or exceeded.
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Flood frequency means a period of years, based on a statistical analysis, during which a flood of a stated magnitude may be expected to be equaled or exceeded.
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Flood frequency means the probability of a flood occurrence which is determined from
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Related to Flood frequency

  • Tidal Flood Hazard Area means a flood hazard area in which the flood elevation resulting from the two-, 10-, or 100-year storm, as applicable, is governed by tidal flooding from the Atlantic Ocean. Flooding in a tidal flood hazard area may be contributed to, or influenced by, stormwater runoff from inland areas, but the depth of flooding generated by the tidal rise and fall of the Atlantic Ocean is greater than flooding from any fluvial sources. In some situations, depending upon the extent of the storm surge from a particular storm event, a flood hazard area may be tidal in the 100-year storm, but fluvial in more frequent storm events.

  • Flood hazard area means any area subject to inundation by the base flood or risk from channel migration including, but not limited to, an aquatic area, wetland, or closed depression.

  • Special Flood Hazard Area means an area that FEMA’s current flood maps indicate has at least a one percent (1%) chance of a flood equal to or exceeding the base flood elevation (a 100-year flood) in any given year.

  • Special Flood Hazard Area (SFHA means the land in the floodplain subject to a one percent (1%) or greater chance of being flooded in any given year, as determined in Article 3, Section B of this ordinance.

  • Flood fringe means the portion of the floodplain outside the floodway that is usually covered with water from the 100-year flood or storm event. This includes, but is not limited to, the flood or floodway fringe designated by the Federal Emergency Management Agency.

  • Flood Program means the National Flood Insurance Program created by the U.S. Congress pursuant to the National Flood Insurance Act of 1968, the Flood Disaster Protection Act of 1973, the National Flood Insurance Reform Act of 1994 and the Flood Insurance Reform Act of 2004, in each case as amended from time to time, and any successor statutes.

  • Area of special flood hazard means the land in the floodplain within a community subject to a one percent or greater chance of flooding in any given year.

  • Regulatory Flood Protection Elevation means the “Base Flood Elevation” plus the “Freeboard”. In “Special Flood Hazard Areas” where Base Flood Elevations (BFEs) have been determined, this elevation shall be the BFE plus two (2) feet of freeboard. In “Special Flood Hazard Areas” where no BFE has been established, this elevation shall be at least two (2) feet above the highest adjacent grade.

  • 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 Hazard Boundary Map (FHBM means an official map of a community, issued by the FEMA, where the boundaries of the Special Flood Hazard Areas have been defined as Zone A.

  • Flood Zone means areas having special flood hazards as described in the National Flood Insurance Act of 1968, as amended from time to time, and any successor statute.

  • Road hazard means a hazard that is encountered while

  • Flood or flooding means a general and temporary condition of partial or complete inundation of normally dry land areas from:

  • Floodplain or flood-prone area means any land area susceptible to being inundated by water from any source. See "Flood or flooding."

  • Lead hazard means any substance, surface or object that contains lead and that, due to its condition, location or nature, may contribute to the lead poisoning or lead exposure of a child under 6 years of age.

  • 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.

  • Base flood elevation means the depth or peak eleva- tion of flooding, including wave height, which has a one percent or greater chance of occurring in any given year.

  • 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.

  • COVID-19 hazard means exposure to potentially infectious material that may contain SARS-CoV-2, the virus that causes COVID-19. Potentially infectious materials include airborne droplets, small particle aerosols, and airborne droplet nuclei, which most commonly result from a person or persons exhaling, talking or vocalizing, coughing, sneezing, or procedures performed on persons which may aerosolize saliva or respiratory tract fluids, among other things. This also includes objects or surfaces that may be contaminated with SARS-CoV-2.

  • Fire hazard means any situation, process, material or condition which may cause a fire or explosion or provide a ready fuel supply to increase the spread or intensity of the fire or explosion and which poses a threat to life or property;

  • Flood Hazard Property means any Real Estate Asset subject to a mortgage in favor of Collateral Agent, for the benefit of Secured Parties, and located in an area designated by the Federal Emergency Management Agency as having special flood or mud slide hazards.

  • Airport hazard means any structure, object of natural growth, or use of land which obstructs the airspace required for the flight of aircraft in landing or taking off at an airport, or is otherwise hazardous to such landing or taking off of aircraft.

  • 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 by some similarly unusual and unforeseeable event which results in flooding.

  • 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) or flood-related erosion hazards.

  • Flood plain means land that:

  • Nuclear Hazard means any nuclear reaction, radiation, or radioactive contamination, all whether controlled or uncontrolled or however caused, or any consequence of any of these.