Research and analysis

Low flow frequency analysis guidelines for best practice

Provides guidance on best practice for frequency analysis of annual minimum flows.

• From: Environment Agency
• Published: 1 January 2002

Documents

Low Flow Frequency Analysis Guidelines for Best Practice

Ref: ISBN 1857059964, LIT 1594

PDF, 1.8 MB, 40 pages

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Details

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.

Published 1 January 2002