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Amersham, United Kingdom

Bridle R.,Dam Safety Ltd.
Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 | Year: 2015

The International Commission on Large Dams (ICOLD) Bulletin 164: Internal Erosion of Existing Dams, Levees and Dikes, and their Foundations, presents an improved understanding of the mechanics of internal erosion. It shows that internal erosion initiates when the hydraulic forces imposed by water flowing through soil fill or foundation materials exceed the ability of the soils to resist them. This normally occurs when hydraulic gradients and water level are high. It gives methods to establish when internal erosion will initiate in concentrated leaks, by backward erosion, by contact erosion and by suffusion. It also gives methods to assess whether erosion will be arrested by some kind of filtering action in filters or shoulder fills. The paper presents the major findings of the Bulletin and demonstrates its use by examining case histories to explain why internal erosion did or did not occur. © The authors and ICE Publishing: All rights reserved, 2015. Source


Bridle R.,Dam Safety Ltd. | Fry J.-J.,Electricite de France | Brown A.J.,Jacobs Engineering
Managing Dams: Challenges in a Time of Change - Proceedings of the 16th Conference of the British Dam Society | Year: 2010

The improved understanding and investigations on-going at dams and levees in Europe and elsewhere (notably Australia, Canada, Australia and USA) has led to a proposal to draft an ICOLD bulletin on assessing the vulnerability of existing dams without filters to internal erosion and how to deal with any deficiencies. The paper is an early version of the proposed bulletin. Source


Bridle R.,Dam Safety Ltd.
Dams and Reservoirs | Year: 2014

This is a report on the activities of the International Committee on Large Dams (ICOLD) Technical Committee on Embankment Dams at the ICOLD annual meeting in Bali. It includes a contribution to the workshop on the new ICOLD bulletin on small dams © 2014, Thomas Telford Services Ltd. All right resurved. Source


Williamson T.,Dwr Cymru Welsh Water | Mason P.,MWH | Bridle R.,Dam Safety Ltd. | Grubb K.,KGAL Consulting Engineers | Tudor S.,Dwr Cymru Welsh Water
Dams and Reservoirs | Year: 2015

The ICOLD Annual Meeting and Congress were held in Stavanger, in the southwest of Norway. Delegates from the BDS attended the various technical committee meetings, the general assembly, technical presentations, tours and social events. A summary description of some of these are included within this report. © 2016 ICE Publishing: All rights reserved. Source


Bridle R.,Dam Safety Ltd.
Scour and Erosion - Proceedings of the 7th International Conference on Scour and Erosion, ICSE 2014 | Year: 2015

The improved understanding of internal erosion presented in ICOLD Bulletin 164: Internal Erosion in Existing Dams, Dikes, Levees and their Foundations shows that internal erosion initiates when the hydraulic forces imposed by water flowing through dams exceed the capacity of the soils in the dam and its foundation to resist them. If the materials in zoned dams have no filtering capacity, erosion will continue and progress towards failure. The paper examines a number of internal erosion incidents at embankment dams using the knowledge given in the Bulletin. The mechanisms that initiated the erosion and the capabilities of the fills in the dams to arrest erosion, sometimes after substantial leakage, are investigated and explained. How the incidents and their causes provide guidance for practitioners on the effectiveness of monitoring and the need for remediation is highlighted. Topics for further research are also suggested. © 2015 Taylor & Francis Group, London. Source

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