Traditional drainage moves storm water as rapidly as possible to a watercourse or river in order to avoid polluting clean water supplies. This is normally achieved via gravity pipelines or culverts.

Sustainable drainage systems replicate natural drainage patterns, keeping rainwater on site longer and through sustainable drainage, we are realising the concept of natural water re-cycling - something that is extremely high on the public agenda, as attention sharply focuses on exactly what we put back in the ground.