Richard Parry, chief executive of the Canal and River Trust, which runs the reservoir, warned last night that it could be “at least 24 hours” until they can rule out the dam collapsing.
“We clearly don’t know the nature of the failure, we’ve not had the opportunity to examine it, but we’re operating in a very precautionary way with the other agencies.
“Our first priority is to draw down the water and it’s very important that we do keep everyone out of the area until that is done.
“It will be at least 24 hours, it could be longer, it really depends on how much progress we can make overnight and into tomorrow morning.”