What are Sustainable Drainage Systems (SuDs)?

Sustainable Drainage Systems (SuDS) are designed to mimic the effects of natural drainage systems, thereby reducing and, if possible, eliminating runoff from a given site.

SuDS are increasingly required components of developments. They integrate water management within new and existing sites - rather than obliging flood water to be dealt with 'downstream' - often with disastrous consequences.


SuDS Components

The components form a 'management train' which is multi-functional and includes:

  • water treatment: via filter strips and porous elements;
  • water storage: in green roofs, swales, ponds and basins;
  • conveyance: water is moved using only gravity, in swales and ditches;
  • flow attenuation: via control points.

Click on the 'Gallery of SuDS components' to see examples.

Water is handled cleanly and safely - on the surface where possible - in a landscape designed for aesthetics, amenity and nature.


Are SuDS expensive and difficult?

Absolutely not!

SuDS have a history in the UK of being expensively over-engineered, but this need not be the case. As Landscape Architects, we integrate SuDS within the site design, from concept master plan to detailed layout and implementation. When properly considered from the outset, good SuDS design provides safe and low-cost opportunities to:-

  • significantly reduce capital and long-term management costs;
  • improve bio-diversity (which also helps with BREEAM ratings);
  • provide social and economic benefits through improved aesthetics and function.

Why 2B?

Our 2B landscape team has undergone recognised CIRIA design training to undertake SuDS planning and design work, in collaboration with other trained professionals.

Involve us ASAP!

The CIRIA SuDS Manual 2015 states "Provided that drainage is considered early enough in the outline design of a new development then there is no reason why SuDS should not become the norm everywhere.... Where SuDs are designed to make efficient use of the space available, they can often cost less to implement than underground piped systems".

We would be delighted to discuss your requirements, so do please get in touch - as early in your project as possible!