The Tryweryn flooding or Tryweryn drowning (Welsh: Boddi Tryweryn), refers to the flooding of the rural community of Capel Celyn to the north west of Bala in Gwynedd, Wales, in the Afon Tryweryn valley. The village and other parts of the valley were flooded in 1965 to create Llyn Celyn reservoir, in order to supply Liverpool and Wirral with water for industry.[1]
The Tryweryn flooding was opposed by 125 local authorities and 27 of 36 Welsh MPs voted against the second reading of the bill with none voting for it. At the time, Wales had no Welsh office (introduced in 1964) or any devolution.[2]