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Water special: projects compendium 2009

NCE’s water projects compendium is a snapshot of two water projects that have been ongoing in the past year: Huddersfield Waste Water Treatment Works and Barrow town centre’s improvements programme.

More from: Every Last Drop

Mouchel:

Barrow DG5

United Utilities undertook a programme of improvements in Barrow town centre to reduce the number of properties on the cellar flooding risk register.

The most significant element involved the construction of 29.5m diameter and 29.5m deep storage tank capable of holding more than 10M l of storm flows and associated tunnelling under the town centre. A 500m length of sewer was constructed 12m below one of the busiest main roads in the town using a Lovat boring machine to drive a 2.1m diameter tunnel connecting the existing sewer with the new tank.

It was possible to site the main sites away from the public highway to minimise impact on roads and transport. Throughout the project, excellent relations were maintained with neighbouring businesses.

Research into the history of the area indicated that the bulk of the bombing that occurred during World War II was away from the construction sites, however the possibility of discovering unexploded bombs could not be ruled out. Fortunately, none were found.

Fact file

  • Start/Finish: December 2006 to March 2009
  • A town centre scheme with two main construction sites in the centre of Barrow, each with a high density of vehicular and pedestrian traffic passing.
  • Mouchel’s role: Civil Designer (as part of KMI+ consortium)
  • Project Cost: £14.5M
  • 10Ml: capacity of the storage tank
  • 720t: the weight of the tank roof, comprising 48 super-size concrete slabs resting on 12 huge beams
  • 100cm: thickness of the tank’s outer diaphragm walls
  • 500m: length of the sewer constructed 12m below one of the busiest main roads in Barrow.

 

Grontmij:

Huddersfield Waste Water Treatment Works

Improvements to Yorkshire Water’s existing works were required to ensure compliance with more onerous effluent discharge consent standards imposed under the Freshwater Fish Directive.

This project impacts on the most complex waste water treatment works in Yorkshire. Two large catchments (Huddersfield and Brighouse) are served by treatment works spread over six sites. Around 30% of the flow and load comprises trade effluent from the local chemical and textile industries. A new, tighter consent comes into force in March 2010 which will impose a more stringent ammonia standard.

Grontmij provided detailed design services to Morgan Est for a design and construct contract of a new activated sludge plant as part of a strategic relationship on the AMP4 Large Scheme Framework for Yorkshire Water.

Fact file

  • Start/Finish: January 2007 to March 2010
  • Four new aeration lanes including integral selector zone and returned activated sludge pumping station
  • Four 40m diameter settlement tanks
  • Detailed design team based on site working in a collaborative environment with the construction team, client and project manager
  • When completed, the flow to full treatment for the plant will be 1372 l/s
  • £22M construction cost
  • 1,000t crane (UK’s largest) used to lift pipe 1.9m in diameter and 55m in length into place over the River Calder linking Lower Brighouse WwTw and Heaton Lodge WwTw
  • 148,000 people served by the treatment works

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