The first reservoir to be built in Britain this century is planned for Somerset. Bristol Water wants the £100 million development to go next to the existing one in Cheddar.
People living in the area are being asked for their views as our Somerset Correspondent David Woodland reports.
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Chancellor Philip Hammond has delivered his Budget which he believes will help build "a Britain fit for the future".
Sophia Bird has the forecast for Devon, Cornwall, Somerset and Dorset.
Sophia Bird has the forecast for Bristol, Wiltshire, Somerset, Dorset and Gloucestershire.