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

Stewart, E. J.; Jones, D. A.; Morris, D. G.; Fung, C. F.; Svensson, C.. 2007 Initial statistical analyses of hourly maximum data. Report to Defra, project WS194/2/39 (Reservoir Safety - Long Return Period Rainfall). Wallingford, Centre for Ecology and Hydrology, 24pp. (UNSPECIFIED) (Unpublished)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 (UNSPECIFIED)
Programmes: CEH Programmes pre-2009 publications > Water > WA01 Water extremes > WA01.1 New methodologies to quantify floods, flows and droughts
CEH Sections: Boorman
Funders/Sponsors: DEFRA
Additional Keywords: rainfall, frequency analysis, extreme value distribution
NORA Subject Terms: Hydrology
Date made live: 19 Feb 2008 14:55
URI: http://nora.nerc.ac.uk/id/eprint/2335

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