Hi
I'm from Severn Trent and we thought it was important to give you the correct information.
The initial premise - that we must have opened Ladybower on Friday is down to a misreading of our figures. A change from -1 (roughly) to -3 is actually an increase in water in Ladybower (as you'd expect with so much rain on the day). Basically, a plus figure means the level is below the overflow (i.e. lower) and a negative one is above overflow (i.e. higher). A higher negative figure means the level is higher above the overflow which, obviously, wouldn't be the case if we'd opened up the dam and released into the Derwent.
As you're undoubtedly aware, we only release when asked by the Environment Agency (as they look after the Derwent) and we haven't been asked to do this since early October (i.e. over a month ago). There was no release on Friday.
In fact, our teams were out and about over the weekend protecting our own assets (treatment works and pumping stations) from the floodwater, as well as helping emergency services and local councils in the flood relief efforts.
I hope this clears things up.