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

  • Location of surface waters such as wetlands seasonally inundated > 180 days, submerged marshes or swamps, and the Mean high water line (MHWL) of any tidally influenced Surface water or the Mean annual flood line (MAFL) of any non-tidally influenced surface water such as ponds, lakes, rivers, streams, canals, waterways, ocean, etc.

  • Mean annual flood is 19 m3 s−1 but the largest recorded flood reached 35 m3 s−1.

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

  • Mean annual flood is the mean of the maximum flood discharges experienced at a particular stream gauge over a series of years.

  • Mean annual flood flows in the Waimakariri River (gauged 5 km from the sea) is 1520 m3s-1, with a probable maximum flood of 8000 ± 1000 m3s-1, and mean annual flow of 121 m3s-1 (NCCB 1991, Reinfelds and Nanson 1993).

  • Mean annual flood in the Pelorus is approximately 950 m3/s.A summary of river flows for September 2023 can be seen below in Table 2.

  • MAF = 8.738A0.828 r = 0.704250 Mean annual flood MAF (m3/s)200 150 100 50 00 5 10 15 20 25 30 35 40Catchment area A (km2) Observed mean annual floods Fitted curve Figure 7.

  • Mean annual flood discharge is the arithmetic mean of all the annual peak floods at a given site and should not be confused with the flood having a recurrence interval of one year.

  • 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 peaks from pines averaged 35% of those from pasture, while 50-yr-flood peaks averaged about 50% of those from pasture.

Related to Mean annual flood

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