Provides guidance on best practice for frequency analysis of annual minimum flows.
Ref: ISBN 1857059964, LIT 1594 PDF, 1.8MB, 40 pages
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The general issues to be considered when contemplating a frequency analysis are discussed with a strong emphasis on likely sources of error and uncertainty. In order to encourage a consistent methodology to be adopted in the UK a single parametric approach for estimating the probability of occurrence of low flow events is recommended. This approach is based on the use of L-moments with a Pearson Type III probability distribution to estimate the flow - return period relationship for annual minima of different durations.