roughly 2.5 miles long by 1 miles wide, and has a maximum depth of 140 ft. It has the capacity to hold 71200000 m3 of water.

It was originally to be named Llyn Tryweryn Mawr (meaning "great Tryweryn lake"), but in September 1964 Liverpool Corporation agreed to the name change following a letter from the Tryweryn Defence Committee.

Construction and opposition

Construction of the reservoir for Liverpool Corporation Waterworks

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