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The Derwent Valley Aqueduct is one of Severn Trent Water’s most important assets, forming part of its strategic water grid it supplies more than 590,000 people with 200 million litres of treated water per day. It consists of 180km of large diameter pipeline, 16km of single 1.9m diameter tunnel, 1,000 valves, 74 bridges and culverts, and 307 other structures and …