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Yeah I agree with you about the laser Keith, it would be difficult on the water surface - it was suggested to me that you would put a floating reflector on the bottom. I'm not so sure about that, and with the high cost I don't think it is a viable option. I'd love to see that subwoofer in...

Thanks so much Dan for your ideas. I've had a look at Optech's laser specs, and it seems to solve the situation perfectly. But I just received a quote from them - $9000 (!) The LR460 only has a range up to 100m, but I will look into installation location possibilities which would make this a...

Thanks Keith, I'm not so much wanting to control the pumping with the level, as just to monitor the level for regulatory requirements. I do like the idea of the radar or sonic system - the only problem I had was that the maximum range measured is generally only tens of metres, not hundreds. If...

Thanks for your replies. I had a read of that epic thread! Certainly some interesting ideas. It also answered some of my questions about the pressure down the bore and other things, so thanks very much for pointing me in that direction =) To answer your questions: Looking at the diagrams...

Hello, I was hoping to get some ideas about how to measure the water level in these very deep artesian bores. The water level sits at around 300m below ground, but we would only need to measure around 10m (max) fluctuations. It will be a permanent fixture and needs to be a continuous level...