During the 20th century, many waterways, seen as little more than drains, were forced into concrete channels to prevent localised flooding and allow urban development. The Environment Agency estimates that 70 per cent of London’s 600 kilometres of rivers have been concreted over or modified in other ways, by constructions such as weirs, which may actually be adding to the flood risk.

‘River restoration can reduce the risk of flooding to homes and businesses, and with the pressures of climate change, this is yet another compelling reason to take care of our environment,’ said the agency’s David Webb.

Since the 1980s, work has been taking place to liberate trapped rivers, and 15 kilometres of waterways have already been restored, including the River Quaggy in Greenwich, which has been released from an underground culvert and can now be seen flowing through a park. This resulting wetland area has attracted wildlife, including kingfishers and dragonflies, and the park also now acts as a floodplain to protect the surrounding area during heavy rains.

‘Healthy rivers are vital in supporting a range of habitats for London’s wildlife and acting as corridors for species such as otters and water voles to return to the city,’ said Emily Brennan of the London Wildlife Trust.

Other rivers set to be restored by 2015 include the Effra, the Wandle and the Colne. A full list of the proposed projects is available on the River Restoration Centre’s website (www.therrc.co.uk).

March 2009