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Last edited 02 Mar 2021
A sequential test is required if:
- The development is in flood zone 2 or 3, AND
- A sequential test has not already been done for a development of the type proposed on the proposed site.
A sequential test is not required if:
- The development is a ‘minor development’ OR
- The development involves a change of use, unless it is a caravan, camping chalet, mobile home or park home site OR
- It is a development in flood zone 1, unless there are flooding issues in the area of the development.
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.
 Related articles on Designing Buildings Wiki
- BREEAM Flood risk management.
- BREEAM Surface water run-off.
- Design flood event.
- Design flood level.
- Flood and Water Management Act.
- Flood defences
- Flood plain
- Flood risk
- Flood risk assessment.
- Flood risk management plan
- Flood zone
- Minor development.
- Planning for floods.
- Property flood resilience
- Sustainable urban drainage systems.
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