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Regional flood and storm hazard assessment

Dales, M. Y; Reed, D. W.. 1989 Regional flood and storm hazard assessment. Wallingford, Institute of Hydrology, 159pp. (IH Report No.102)

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Abstract/Summary

The report is the outcome of a 3-year investigation of "regional flood and storm hazard over reservoired catchments" funded by the Department of the Environment's reservoir safety committee. It describes an analysis of spatial dependence in annual maximum 1, 2, 4 and 8-day rainfalls in the UK A procedure is presented for assessing the annual collective risk of an extreme rainfall being experienced at one (or more) of a network of critical sites. The concept of an equivalent number of independent sites is introduced: the number is shown to be strongly influenced by the number of sites and their spatial density, with lesser effects attributable to region, rainfall duration and return period. A corollary of spatial dependence is that, when an extreme rainfall event occurs, it may lead to design exceedances occurring simultaneously at a number of sites. The report draws conclusions for the perception of reservoir flood risk in the UK. Attention is also drawn to marked regional variations in point rainfall growth curves that are not fully represented in existing design procedures.

Item Type: Publication - Report (UNSPECIFIED)
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Pre-2000 sections
ISBN: 0948540141
Funders/Sponsors: NERC
Additional Information. Not used in RCUK Gateway to Research.: scanned legacy working document
Additional Keywords: reservoirs, flood risk, extreme events
NORA Subject Terms: Hydrology
Date made live: 10 Feb 2009 12:13
URI: http://nora.nerc.ac.uk/id/eprint/6042

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