Fundamental to the SUDS system is the attenuation crate or tank.
Attenuation tanks collect surface rain water run-off, which allows the water to be released at a steady rate into existing surface water sewers. The tank therefore attenuates, or reduces, the impact of excess surface water (such as might occur after particularly heavy rainfall) on the drainage system.
To mitigate any increase in downstream flood risk as a result of the redevelopment of the any site, surface water can be stored in attenuation tanks until the peak surface water flow in the sewer has passed. The attenuated water is released at a lower, acceptable flow rate into the drainage network.
- The tank is part of a Sustainable Urban Drainage System (SUDS).
- The tanks are used to store water for slow release to the drainage sytem.
- The rate of discharge from the units is designed to mimic as close as possible the greenfield condition of the site.
- The units provide storage which makes an allowance for future climate change (+30%).
- By providing storage and reducing the discharge from a site you can reduce the risk of flooding to the surrounding drainage and watercourses.
Urban flooding is becoming an increasingly important issue, particularly as climate change scenarios predict increases in more intensive rainfall events. The installation of sustainable drainage systems, such as the attenuation tank, is a requirement under higher levels of the Code for Sustainable Homes.
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