December 2016 -

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Updating London’s Lost Rivers

Wednesday, December 14th, 2016

Melina Road polypipe install‘Innovative’ Sustainable Drainage Helps Manage Urban Flood Risk

Homes near one of London’s lost rivers are at increased risk of flooding but a new sustainable drainage project from Thames Water could provide a solution. When it comes to London, the majority of people are familiar with the River Thames. Fewer people however are aware of London’s many ‘lost’ rivers which, over time have been slowly buried under the capital, hidden beneath layers of streets and buildings. One such ‘lost’ river is Counters Creek in the Hammersmith and Fulham area. The river originally flowed through West London to join the Thames, but in the nineteenth century, due to population growth, it was diverted underground to form part of the combined public sewer network.

Flood Risk

The idea of lost rivers may sound somewhat romantic and mysterious, but in reality they can pose a big headache for nearby homeowners, particularly those who have properties with a basement level. Between 1971 and 2007, the area surrounding Counters Creek lost around 20 percent of its permeable green space. This, along with the loss of all open watercourses in the locality, has led to a rise in surface water run-off which, in turn, increases the risk of flooding in the local sewer network.

Innovative Solutions

In order to manage the flood risk in this area, Thames Water has worked with partners to pilot an innovative retrofit scheme which monitors and assesses the effectiveness of several different surface water management systems. Taking place across three London streets - Mendora Rd, Melina Rd and Arundel Gardens - the scheme uses Polypipe’s Permavoid geocellular system to reduce the flow of surface water into the sewer system. However, each street uses a slightly different system that is tailored to that specific environment. At Mendora Rd, Permavoid

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