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

This file may not be suitable for users of assistive technology.

Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email enquiries@environment-agency.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

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