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.
Flood frequency means the frequency for which it is expected that a specific flood stage or discharge may be equaled or exceeded.
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.

Examples of Flood frequency in a sentence

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


More Definitions of Flood frequency

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.
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.
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;
Flood frequency means a statistical expression of the average time period between floods equaling or exceeding a given magnitude.
Flood frequency means the probability of a flood occurrence which is determined from

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

  • 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.