In cooperation with

Greenstreets

The goal is to slow down the flow of water into the sewer during periods of rainfall by detaining stormwater on-site.

Year: 2016
Location: London, United Kingdom
Partners: Sel Environmental
Water capacity: 1.000 m2 = 150.000 liter

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Showcase

A closer look at this build-up at the Greenstreets in London:

Stormwater retention capacity: resulted in 97% reduced flowrate during peak rain events.

The goal is to slow the flow of water into the sewer during periods of rainfall by detaining stormwater on-site.

Story

Counters Creek Flood

Between 1971 and 2007, the Counters Creek area in London 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 increases the risk of local flooding. As part of the London Greenstreets program a sustainable urban drainage installation was constructed at Arundel Gardens in the Royal Borough of Kensington and Chelsea to reduce sewer overflow into open water and minimise the risk of urban flooding.

"Water is our most precious resource and should never be spilled."

Solution

How does it work?

The goal is to slow the flow of water into the sewer during periods of rainfall by detaining stormwater on-site. Creating substantial stormwater detention volume in a densely build area is not easy, but with backing of Thames Water, the Borough and Transport for London a design was created with the detention volume in Permavoid units directly below the road surface. Rainwater enters the Permavoid detention system through a permeable asphalt road surface layer and prior to entering the storage tank, water passes through the PermaFilter geomembrane to remove any oils and other vehicle pollitants.

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