The Vartry Reservoir  is located at Roundwood in County Wicklow.  The original (lower) reservoir was completed in 1863, and has a capacity of 11.3 billion litres and a maximum depth of 18.3 meters. A second embankment, 3.5 km upstream, was completed in 1923 to form the upper reservoir. This has a capacity of 5.6 billion litres and a maximum depth of 13.4 metres.

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