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Sustainable Drainage Systems (SuDS)

As part of the planning process, developers are often required to present their plans for a Sustainable Drainage System. These must demonstrate the measures they will put in place to manage surface water in order to minimise the risk of flooding and pollution, both on their site and in the surrounding area.

Phlorum has extensive experience in providing SuDS reports for projects nationwide.

In producing our Sustainable Drainage System (SuDS) reports, Phlorum use advanced flood modelling and detailed topographical data to show how surface water (usually resulting from rain) will behave on a site and affect the site and the surrounding area. It determines the runoff rate, flow pathways and infiltration potential. We then assess the effect of the development and of various techniques that can be used to control runoff. The final report will demonstrate how the proposed Sustainable Drainage System meets the requirements of national and local planning policies

The recommended techniques are likely to include elements of these three main types of SuDS:

  • Source Control Techniques – techniques designed to counter increased surface water runoff close to the source (e.g. porous pavements, infiltration trenches and infiltration basins);
  • Permeable Conveyance Systems – techniques to move runoff water slowly towards receiving watercourses, allowing storage, filtering and some loss of water through evaporation (e.g. swales, filters and French drains); and
  • Passive Treatment Systems – these use natural processes to remove and break down pollutants from surface water run-off (e.g. filter strips, detention basins, retention ponds and wetlands).


Data sheet