Highways England is building a series of ponds along the new A556 Knutsford-to-Bowdon dual carriageway as a flood defence measure.
Contractor Costain is working on the £192M new 7.2km road, where four ponds are being built. They have been designed to deal with surface water run off and other liquids from the road surface such as engine oil and fuel.
The ponds will slowly filter out water contaminants, before feeding into the River Bollin. The first pond at Yarwood Heath, called Pond D, is almost complete and is between an existing slip road and a new link road.
Highways England’s A556 project manager Jonathan Stokes said: “A number of people have asked us about the pond at Yarwood Heath and why it’s being provided. The use of attenuation ponds along the new A556 will significantly reduce the amount of water currently ending up untreated in the local water courses.
“These ponds will considerably improve the environmental credentials of the link between the M56 and M6. They are sustainable and aesthetically pleasing and as well as providing filtration for day to day run-off from the new road, the ponds will act as holding tanks in the event of severe flooding or a major spillage from a collision.”
Construction of the new link roads and roundabout around Bowdon and junction 7 of the M56 should be completed this summer with the new bypass opening in spring next year.