Last edited 02 Mar 2021

Sequential test

A flood risk assessment is required for most proposed developments that are within a designated flood zone.

A sequential test may be required as part of a flood risk assessment. It compares the site for a proposed development with other available sites to determine which has the lowest flood risk.

A sequential test is required if:

A sequential test is not required if:

The sequential test must conclude whether any of the alternative sites that have been identified have a lower risk of flooding than the proposed site. It should be submitted along with the flood risk assessment and the planning application to the local planning authority.

If the sequential test shows that it is not possible to use an alternative site, it may be necessary to undertake an exception test. This shows how flood risk will be managed on the proposed site and demonstrates that the sustainability benefits of the development to the community outweigh the flood risk.

For more information see:

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