Reducing flooding with sustainable drainage

New developments and the environment will benefit from a reduced risk of flooding and pollution thanks to a new approach to drainage.

A consistent approach to sustainable drainage systems is set to be incorporated into new developments in England, following recommendations from a new government review.

This will reduce the risk of surface water flooding, pollution and help alleviate the pressures on our traditional drainage and sewerage systems.

New developments can inadvertently add to surface and sewer flood risk by covering permeable surfaces like grassland and soil that would otherwise assist in dealing with heavy rainfall.

The new approach to drainage will ensure sustainable drainage systems are designed to reduce the impact of rainfall on new developments by using features such as soakaways, grassed areas, permeable surfaces and wetlands. This reduces the overall amount of water that ends up in the sewers and storm overflow discharges. Certain features such as tanks and water butts also allow for water reuse and reduce pressures on water resources.

Following publication of the review, regulations and processes for the creation of sustainable drainage systems at new developments will now be devised, through the implementation of Schedule 3 to the Flood and Water Management Act 2010. Implementation of the new approach is expected during 2024.

Environment Minister Rebecca Pow said: “Our traditional drainage systems are under increasing pressure from the effects of climate change, urbanisation and a growing population.

“The benefits of sustainable drainage systems are many – from mitigating flood risk by catching and storing surplus water and reducing storm overflow discharges, to enhancing local nature in the heart of our developments and helping with harvesting valuable rain-water.

“Taking a more consistent and effective approach to sustainable drainage systems will improve the resilience of our drainage and sewer infrastructure, while reaping these broader benefits.”

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