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 curves shall be provided for the area proposed for development.

  • Flood frequency analysis is a statistical method used to estimate design floods for sites along a river that uses observed peak flow discharge data (usually annual maximums) to calculate statistical information such as mean values, standard deviations, skewness, and recurrence intervals.


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 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 statistical analyses. The frequency of a particular flood event is usually expressed as occurring, on average, once in a specified number of years or as a percent change of occurring in any given year.
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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 the flood or floodway fringe designated by the Federal Emergency Management Agency.