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There was talk of sending warmer water straight into the network but im yet to be convinced by this theory. Intrigued to see the paper.
Some.pipes are deeper than others
This is probably built over time and the pipe has either fractured or the joint has given way. Could have been a surge was in the network from a pumping station. Not sure. If a cutout repair is done then a ndta can be done on the old pipeUpper st is having a new pipe put it. Manage to see it as i went past on thursday am
Is the temperature flipping from mild to cold then back again a factor?
Or not so much as the pipes are underground?