To meet water resource requirements in the future, Essex & Suffolk Water implemented a scheme to increase the storage capacity at their existing reservoir at Abberton, from 26 to 41 billion liters of water. The scheme was designed to minimise impact on the environment and improve amenity and ecological habitats.
Throughout the duration of the project MWH used best practice processes and procedures to the highest professional standards and ensured that value was given to environmental sensitivity and sustainable engineering. The design for raising the existing dam required careful consideration of a number of factors. For example, the earth filled, clay core design took into account the fact that the largest recorded earthquake in the UK was centered just a few miles from the dam. The dam was also subject to a slip event during its original construction, posing additional challenge to the designers. Finite Element Analysis techniques were therefore used for back-analysis of the historic slip to ensure the causes had been understood, and to verify the new design.
Storage capacity was increased by raising the reservoir top water level by 3.2m to provide an additional 15,000Ml of raw water storage, an increase of 58%. Engineering focused on the need to maintain water production, retain existing key assets, and minimise disturbance of the reservoir that was to remain fully operational during construction activities. The infrastructure improvements around the reservoir include a replacement off-take pumping station, re-engineered valve tower, pipelines and discharge channels, an outlet tunnel at the main dam and the re-routing of 2km of existing public highway around the enlarged reservoir perimeter.
- Concept and detailed engineering design.
- Prepare full tender documentation using various options under the NEC ECC Conditions of Contract.
- Technical evidence to support the planning application including detailed method statements
- Celebrated success with Northumbrian Water Group, and its other delivery partners as winners of The Legacy – Sustainability Award at the Constructing Excellence National 2015 Awards.
- Also awarded Exceptional Merit Award for Sustainability and a Merit Award for Delivery.
Delivering the planning application in December 2007, was a critical milestone to ensure the project is delivered on schedule. Acknowledging the work of MWH in achieving this, the client is very happy with MWH’s performance:
“The relationships developed between MWH and the wider project team have been excellent and have enabled difficult challenges to be overcome. There is still much to do but I am confident your team will continue to make a significant contribution to the successful completion of the Abberton Scheme.”
[John Cuthbert, Managing Director, NWL]
- Essex, UK
- 51.825334, 0.864575