Initial statistical analyses of hourly maximum data. Report to Defra, project WS194/2/39 (Reservoir Safety - Long Return Period Rainfall). Draft

Stewart, E. J. ORCID: https://orcid.org/0000-0003-4246-6645; Jones, D. A.; Morris, D. G.; Fung, C. F.; Svensson, C. ORCID: https://orcid.org/0000-0001-9294-5826. 2007 Initial statistical analyses of hourly maximum data. Report to Defra, project WS194/2/39 (Reservoir Safety - Long Return Period Rainfall). Draft. Wallingford, Centre for Ecology and Hydrology, 24pp. (Unpublished)

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Abstract/Summary

This report provides details of preliminary analyses of the systematic rainfall database for durations from 1 to 24 hours, and compares the results with those for durations of 1 to 8 days (Jones et al., March 2007). The analysis reported here considers two aspects of the planned statistical work to develop a revised FORGEX methodology to replace that underlying the Flood Estimation Handbook rainfall depth-duration-frequency model: (i) The assessment of possible families of distributions for describing the annual and seasonal maxima for the full range of durations (1 hour to 8 days), known as marginal distributions. (ii) Evaluation of the scaling assumption, by which the standardisation of observed maxima by a site-specific factor is assumed to remove any differences in distribution between sites so that records from a number of raingauges can be pooled together.

Item Type:	Publication - Report
Programmes:	CEH Programmes pre-2009 publications > Water > WA01 Water extremes > WA01.1 New methodologies to quantify floods, flows and droughts
UKCEH and CEH Sections/Science Areas:	Boorman (to September 2014)
Funders/Sponsors:	DEFRA
Additional Keywords:	rainfall, frequency analysis, extreme value distribution
NORA Subject Terms:	Hydrology
Date made live:	19 Feb 2008 14:55 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/2335

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