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Craven District Council

Sustainable Drainage System Strategy (SuDS)

This applies to all applications proposing 10 or more residential units or 1000 sq. gross floor space or more.

In addition to any requirement for a Flood Risk Assessment (FRA), the following information with regard to surface water drainage must be submitted:

Outline Planning Application

Any outline application for a development falling within the definition of ‘major’ shall be accompanied by a drainage strategy. Information to include:

  • indicative sustainable drainage principles for the development
  • topographical survey showing how water naturally flows on the site together with
  • groundwater and land drainage flows
  • proposed destination for surface water post-development
  • ground investigation results for infiltration (if appropriate)
  • existing and/or proposed watercourses
  • existing and/or proposed surface water sewers and/or pumping stations
  • surface water flows onto the site, flows from the site and flood risk to and from the site
  • offsite works which may be required to provide surface water drainage or mitigate
  • against flood risk
  • sensitive receptors
  • general maintenance principles

Full Planning Applications

In addition to details required for an Outline application (listed above) the following shall be provided:

  • details of compliance with Defra non-statutory technical standards
  • off-site works
  • consents required
  • flow paths through the development
  • surface water storage volumes and locations
  • sub-catchment areas
  • treatment train components
  • proposed landscaping and/or vegetative systems
  • design calculations for:
    -greenfield run-off
    -brownfield run-off if appropriate (including reductions)
    -peak flow rates
    -surface water volumes
    -storage requirements
    -drain down times
    -multi-use areas
    -exceedance routes
    -temporary drainage during construction
    -climate change allowances
    -future development allowances
    -details of how the sustainable drainage system is to be maintained, and by whom, for the lifetime of the development