Mean annual flood definition

Mean annual flood means a flood which has a magnitude (peak discharge) which is expected to be equalled or exceeded on the average once every 2.33 years and has a forty-three percent chance of being equalled or exceeded (0.43 exceedence probability) during any year, by application of the criteria defined in subsection (2) of this section.
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Mean annual flood means that boundary which demarcates the extent of inundation for a flood event with between a 43% to 50% annual chance of occurrence as determined through methods described in the following document, “Guidelines for Determining Flood Flow Frequency, USGS Bulletin 17B of the Hydrology Subcommittee Revised September 1981; Editorial Corrections March 1982.” http://water.usgs.gov/osw/TRB/CohnFloodsTRB_B17B_003.pdf
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Examples of Mean annual flood in a sentence

  • Mean annual flood magnitudes in the Tongass National Forest could increase 17.3% by 2040 and 28.2% by 2080 relative to current conditions (1977-­‐2000), though there will likely be high variability due to local topographic and other hydrological controls (M.

  • Mean annual flood for each link is estimated as the 99.8th percentile flow.

Related to Mean annual flood

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