Sustainable Drainage Systems (SuDS): guidance for developers

Last updated: 12 December 2022

What to provide when applying for permission in principle

If you are applying for permission in principle, you will need to supply the following as part of your application:

  • a flood risk assessment
  • a surface water drainage strategy

The list is not exhaustive, the Lead Local Flood Authority may request additional information depending on site-specific conditions.

Flood risk assessment

You will need to submit a site-specific flood risk assessment if the criteria in Footnote 55 of the NPPF are met.

In a flood risk assessment you will need to:

a. Include surface water, groundwater, fluvial, reservoir, sewer and any artificial waterbodies (e.g. canals).

b. Consider how flood risk may change in the future such as climate change.

c. Apply Sequential Test and Exception Test (if criteria met).

d. Demonstrate a sequential approach to locating a development.

e. Consider mitigation measures.

Surface water drainage strategy

If you need to provide a surface water drainage strategy, it needs to include:

a. Application form

b. Site plan

Technical Detail Consent will require the submission of information detailed under Full Planning applications.