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Lecture

Lessons learnt from reservoir discontinuances

Event organised by The British Dam Society

Date
02 October 2023
Time

This event has now ended

You can catch-up on details or any broadcast and downloads here.

Overview

Redundant reservoirs, whether they are subject to the provisions of reservoir legislation or not, have an ongoing maintenance requirement that places a burden on reservoir owners. Reservoirs upstream of communities also pose a risk to life. For these reasons, reservoir owners often consider discontinuing redundant assets; however, reservoirs can deliver amenity value for local communities as well as contributing to a desirable environmental habitat. Careful consideration should therefore be given to balancing the advantages and disadvantages when deciding whether to discontinue a reservoir.

This presentation will discuss the process which has been followed leading up to discontinuance, outlining the nuances between different parts of the UK and draw on case studies where the merits of discontinuance have been assessed. The key influences and lessons learned will be presented including:

  • identifying and mitigating environmental aspects;
  • the findings from public consultations; the approach to whole life cost estimates;
  • the benefits or otherwise of carrying ground investigations;
  • the approach to dealing with sediment issues;
  • the approach to managing flood risk during removal of the reservoir;
  • and the approach to managing downstream flood risk following removal of the reservoir.

Organised by

The British Dam Society

The British Dam Society

The BDS provides technical subjects relating to the planning, design, construction, maintenance, operation, safety, social and environmental aspects of dams and reservoirs.

Speakers

Ryan McHugh MEng MICE

Ryan McHugh MEng MICE

Mott MacDonald

Mott MacDonald

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Ryan McHugh MEng MICE

Ryan McHugh is a chartered civil engineer with 6 years’ experience in dams and reservoirs for Mott MacDonald. He has worked on a wide variety of dam related projects; from studies to outline, and detailed, design as well as construction support and supervision. He has worked on a number of reservoir discontinuances for Scottish Water and hopes to share knowledge gained and lessons learned in these projects.

Michael McAree MEng MICE

Michael McAree MEng MICE

Mott MacDonald Bentley

chartered civil engineer

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Michael McAree MEng MICE

Michael McAree is a chartered civil engineer with 10 years’ experience working on a variety of reservoir safety schemes on UK existing reservoir assets, including spillway replacement, embankment stability, valve replacements, new drawdown provision and discontinuance in England and Wales. He is currently working as a design manager for Mott MacDonald Bentley based in Newport, primarily focusing on dam safety, clean water and major civil projects.

For more information please contact:

Shelly-Ann Russell

Sustainable Development Goals: