Use of risk-based methods to evaluate spillway capacity: case histories

Hinks, J. and Brown, A. and Gosden, J. and Hewitt, M. and Gardiner, K. (2014) Use of risk-based methods to evaluate spillway capacity: case histories. Dams and Reservoirs, 24 (3).

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Official URL: http://www.icevirtuallibrary.com/doi/abs/10.1680/j...

Abstract

The term ‘risk-based’ in relation to dam safety has now been in use for many years with quantitative methods available for over a decade. This paper explores the meaning of the term ‘risk-based’ and provides examples of its use in relation to assessing the need for spillway upgrades, including its use to asses when risk has been reduced to ‘as low as reasonably practicable’ (Alarp); that is, when the costs of further upgrading are disproportionate to the additional reduction in risk achieved. The paper then discusses the issues arising, including reasons for the apparent adherence to deterministic standards and lack of take-up of the Alarp approach in the UK as well as the management of potential conflict between recommendations from Section 10 inspections under reservoir safety legislation and portfolio risk assessment. The paper does not cover the wider issues of other threats to dams, which may have higher annual probabilities of failure; however, similar principles can be applied to the management of these threats.

Item Type: Article
Subjects: Floods > Dams and reservoirs
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:50
Last Modified: 02 Apr 2020 09:50
URI: http://eprints.hrwallingford.com/id/eprint/969

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