Sustainable Drainage (SuDS)

Sustainable Drainage Systems (SuDS) aim to mimic, as closely as possible, the natural drainage of a site to minimise the impact of surface water runoff from development. The use of SuDS techniques for the management of rainfall runoff on development sites leads to; a reduction in the pollution of rivers; a reduction in flooding risk; potential enhancement of landscape and ecological benefits. SuDS techniques can eliminate the problems associated with conventional drainage by utilising a range of design techniques that ensure runoff is collected, stored and cleaned prior to its controlled release to the environment.

The principle aim of SuDS is to minimise the impact of surface water runoff on the natural environment through flood control, pollution prevention and improved public amenity. Where SuDS techniques utilize vegetated features to treat pollution and manage runoff there is scope to provide enhanced landscaping and to provide additional wildlife habitats and increased biodiversity. Where soil conditions permit, the use of infiltration or partial infiltration drainage techniques minimizes the volumes of off-site runoff and also provides groundwater recharge.

Sustainable Drainage is advocated by the Environment Agency and SEPA and is increasingly required by Local Authorities in the planning process as a result of Planning Policy Statement 25 (PPS 25) - Development and Flood Risk. Through PPS25 and Building Regulations Approved Document H, there is an emphasis on the role of SuDS and a general presumption that they will be used.

Concept

Expertise

• Environmental
• Flood Risk
• Drainage
• Ecology