RE: Pump14 Sep 2023 13:05
Good point divermike about the risk of pollution. Although GF states its rainwater of which I think we all believe, but NRW wouldn't take the chances at all.
But again if they had a suggestion of allowing the water out based on the current average rainfall, then there shouldn't be a problem. If its raining pump more if its dry pump less (could be a solution!).
Another point to make about the pumps, although they will have a good pump or more already, the cheap ones won't have enough power to pump from the bottom of the shafts up and out of the mine. The pumps are sized generally in volume and head height. You can get a pump to let's say do a 1000l/H at 1 metre head. But if the water is a few meters deep and the outlet could also be 5,10,20 metres of head height to the settlement tanks out of the mine the pump will just get back pressure and not get anywhere. So its gonna need a big pump, just to get the water out of the mine.
Just thought I'd help a bit, it's not as simple as it sounds. Ps. I do sell a lot of pond pumps.
Gla and as always I'm trying to help. Good posts divermike, I didn't know about the pollution history makes sense, cheers