Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/1043438
18 ALLIANCES 2019 One of three main delivery teams contracted to Scottish Water, Caledonia Water Alliance (CWA) is a partnership of Stevenage-headquartered contractor Morrison Utility Services and infrastructure giant AECOM. As water infrastructure alliance partner, CWA is responsible for the delivery of construction projects to improve water supply networks north of the border in the six years to 2021. This includes replacing water mains that frequently burst and lining older pipes to improve the quality of the water that passes through them to people's taps. Scottish Water has 5 million customers across 2.5 million households and supplies more than 1 billion litres of water every day to an area covering 77,000km2. The utility is delivering a £3.7 billion investment plan in the current regulatory period. CWA completed a major upgrade to a water mains network in Drymen, central A partnership of US built environment giant Black & Veatch and UK infrastructure specialist Amey was appointed as one of three alliances covering Scottish Water's SR15 regulatory period. The aBV team is the utility's wastewater infrastructure alliance partner for the six-year spell to 2021. As such, it is responsible for construction projects to improve Scottish Water's wastewater networks. This largely consists of replacing old sewers that cause internal and external flooding of properties when they get blocked. The alliance will also construct storage tanks and screens to improve sewer overflow systems, ensuring the environmental quality of burns, rivers and coastal waters continues to improve. Among projects being delivered by aBV is a £2.8 million job to reduce the risk of flooding in and around the Oakmall Shopping Centre in Greenock. In September, the alliance called in Northern Tunnelling to hand-dig Scotland, in half the scheduled time earlier this year. The £750,000 project to improve 6km of pipework along the local water mains network was finished within four months rather than the allotted eight. Engineers were able to use less intrusive techniques of mains replacement than the traditional open cut method on this project as they worked to provide customers with additional resilience and security of supply. Elsewhere, work began this autumn on a six-month project to renew more than 1km of 26m-long tunnels as part of the scheme due to ground conditions. More than 100 tonnes of debris was removed, including reinforced concrete, brickwork foundations, sandstone and whinstone rock. The alliance was also due to spend four weeks this autumn carrying out investigation works ahead of improving Tarbert's sewer network. Other recent projects include building a new control kiosk and upgrading a pumping station at Old Shore Head in Arbroath. Work here recommenced in September water main that serves customers in the Highland town of Nairn, following deterioration in its performance. And an information event took place in Milngavie near Glasgow this summer to enable local people to meet members of the CWA team ahead of a multi-million pound project in that area. CWA is charged with building large-diameter, cross-country trunk mains as part of Scottish Water's programme of building resilience into its water network. aœer a break in the summer. Work was completed on a sewer infrastructure upgrade in Rhu this summer as part of the utility's wider £5 million investment programme in Argyll and Bute. The aBV alliance constructed two underground septic tanks and 425m of new pipework. From April 2015 to March 2018, Scottish Water invested more than £1.5 billion – an average of more than £50 million a month. In spring this year, the utility had started about half of 1,650 projects earmarked for the regulatory period. Caledonia Water Alliance (CWA) PARTNERS: Morrison Utility Services, AECOM CLIENT: Scottish Water CONTRACT: Delivering the SR15 2015-21 water infrastructure programme TERM: Six years aBV PARTNERS: Amey, Black & Veatch CLIENT: Scottish Water CONTRACT: Programme Management, design, stakeholder engagement, construction of sewer infrastructure TERM: Six years CWA delivers improved supply networks aBV advances Scottish wastewater programme aBV is delivering work to reduce flooding risk at Oakmall Shopping Centre ALLIANCES 2019: SCOTTISH WATER