Attenuation tanks are more and more common on new estates as a method to meet the latest SUDS requirements. This will reduce your water bills a bit as it means you don't have to pay for surface water drainage.
Ahh good to know Mark thanks 
What is the usual setup if one of these tanks fills up? Or are they hugely over capacity?
It depends how they have been constructed
Have a read here for more info:
http://www.pavingexpert.com/drain12.htm
Thanks for that link, very interesting reading. As far as I can see in those examples no over-flow was fitted, unless in my situation another drain pipe was taken off top and down to drains.
As it's sealed in those examples, I guess it either backs up along the drains, or the pressure of water forces it to be adsorbed quicker?
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Topic: attenuation tank (Read 7976 times)