Elan Valley Aqueduct – Bleddfa

Share on:

The Elan Valley Aqueduct (EVA) was constructed in 1904 to provide drinking water to the city of Birmingham, UK. The aqueduct is operated and maintained by Severn Trent Water.

GHD is playing a key role in helping the Barhale North Midland Construction Alliance (BNMA) construct four sections of new aqueduct, reinforcing sections of the original structure that are showing signs of structural distress. Bleddfa was the first site to be addressed, with a regulatory output date of March 2017.This tight deadline was achieved through a fast track design process undertaken in close collaboration between Severn Trent Water, BNMA and GHD.

At Bleddfa, our team developed detailed civil, structural and geotechnical design for a 1.8km long new 3.05 m internal diameter segmentally lined tunnel plus connection structures and temporary works.

Collaborative approach delivers benefits

We simplified the Tunnel Boring Machine (TBM) launch methodology by combining the TBM drive pit and the connection cofferdam in to one, removing the need for a separate 12 m diameter and 10 m deep secant piled shaft. This also reduced the working area substantially, facilitating planning permission, as well as the requirement for cut and fill operations.

We removed the requirement for internal propping of the EVA structure by developing a method for exposing and wrapping the EVA using a staged excavation method. This also reduced the work required – considerably – during an outage.

In addition, our team liaised with BNMA to develop a method that allowed flows to be turned outside the shutdown of the aqueduct. This maximised the chances of achieving the ODI whilst utilising only one shutdown.

Securing water for the future

Flows were turned into the new tunnel at the end of February in March 2017, helping Severn Trent Water achieve its regulatory objective. The finished project will increase the lifespan of the EVA and improve the resilience of Birmingham’s drinking water supply.

Geotechnical

image

Our services include:

Investigation

Read More . . .

Structures

image

We have a strong reputation, a record of accomplishment in providing world-leading technical support and advice for all areas of structural design and assessment.

Demand for GHD’s services continues to grow as the company completes and advises on a number of significant structural projects for some of the world’s tallest buildings, inlcuding Al-Bidaa Tower, Dubai Tower and the Doha Convention Center and Tower in the United Arab Emirates.

Read More . . .

Tunnels

image

Drawing on our depth of international and Australian experience, GHD is well positioned to provide routine design as well as expert services for all phases of tunnel and underground space projects.

Our people have worked on some of the most iconic tunnel projects in Australia and around the world. We continue to push technical boundaries and have achieved key milestones and optimum outcomes in soft soil to hard rock environments. Our experience has grown through the delivery of award winning technical solutions to both contractors and client organisations in Australia and internationally.

Read More . . .

Water Transmission & Distribution

image

We share a strong commitment to working in partnership with you. That way, you can fully understand how your water systems work. Our engineers, scientists and ecologists address sustainability, water loss reduction and water efficiency improvements.

Services:

Read More . . .

Related Projects
By Geotechnical
By Structures
By Tunnels
By Water Transmission & Distribution