Estimating Flood Frequency - World Hydrological …

Estimating Flood Frequency Duncan, revised by John Fenwick 2005 Introduction Flood Frequency is the concept of the probable Frequency of occurrence of a given Flood . For the design of engineering works, for example, it is not sufficient to say that the maximum observed Flood was, say, 900 m3/s; it is also necessary to say what is the Frequency of occurrence of this Flood . If the 900 m3/s Flood referred to above is a size that occurs on average once in every 10 years, then for instance any bridge designed to cope with this would be under-designed by most sensible standards, and we could expect that it might not last very long. Normally the design problem is an economic one, involving the capital and on-going costs of a conservatively large structure versus the greater risk of loss of a smaller and cheaper one. As well as engineering works like bridges, dams, etc, Flood Frequency information is commonly applied to controlling land use and settlement on Flood -prone areas, and has many other applications.

FRED Plot 1968 to 1982 Annual prob. greater site 91401 Grey at Dobson Jul-1968 thru Dec-1982 Flow m3/s m=12 Gumbel Distn. Location & Scale= 3610.

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