Repairing a 19th Century reservoir More than 170 years after its construction in 1837, the outfall structure of Cheshunt North Reservoir, located thirteen miles North West of London, was in a deteriorating condition. Some of the original mortar used in the masonry construction had been washed away over the years, leaving the structure weakened, and evidence of leakage had been observed. There were also concerns about other internal structu

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