Sustainable urban drainage systems (SuDS) will be a planning requirement for major developments (ie developments of ten dwellings or more and equivalent non-residential schemes) from 6 April 2015.

Currently, the National Planning Policy Framework (NPPF) only needs SuDS to be prioritised for new developments in areas at risk of flooding. However, from 6 April 2015 sustainable drainage becomes a planning requirement, and decisions on planning applications from this date will be expected to make sure that SuDS are in place for the management of run-off.

Also, to make sure that arrangements are in place for ongoing maintenance over the lifetime of the development, conditions will be added to planning decisions, or developers will be expected to enter into a legal agreement under S106 of the Town and County Planning Act 1990 (as amended).

From 6 April 2015, all major applications will need to be supported by the following information. Applications will not be made valid without this information.

  1. Detailed site layout at an identified scale
  2. Topographical survey of the site
  3. Plans, drawings and specification of SuDS proposed. This should include detail of hard construction, soft landscaping and planting
  4. Calculations of discharge and run-off rates, water storage capacity of the proposals, and demonstration that they meet the requirements of the site
  5. Details of any offsite works required, together with necessary consents
  6. Management and maintenance plan for all SuDS.

Please email flooding@lambeth.gov.uk for further information on SuDS and the above requirements.