![]() You can find out which flood zone your property site is on by heading over to the Gov.uk website and inputting your town, postcode or National Grid Reference. For example, if a developer wants to change a building’s use from a commercial use to a residential dwelling, they will have to take into account how the development will affect the flood risk associated with surface water and reservoirs. In Zones 2 and 3, minor developments and changes of use of the property or land will require a flood risk assessment. If a Zone 1 area has critical drainage notices issued by the Environment Agency, an assessment will be required. However, that doesn’t mean that property developers working in Zone 1 areas are automatically free from flood risk approving authorities. The only properties that don’t require mandatory flood risk assessments are properties that fall into Zone 1 (low probability of flooding). Do I Need a Flood Risk Assessment?Īll properties in Flood Zones 2 or 3 will require a flood risk assessment. These areas are typically noted as having a 1 in 20 year annual probability of flooding. This is where flood water is stored in the event of sea and river flooding. Zone 3b areas are within the ‘functional floodplain’. Zone 3a areas have a high probability of flooding that is a 1 in 100 chance of river flooding or a 1 in 200 chance of sea flooding. Zone 2 areas have a medium probability of flooding that’s between a 1 in 100 – 1 in 1,000 chance of annual river flooding or a 1 in 200 – 1 in 1,000 annual probability of sea flooding. Land within Flood Zone 1 is categorised as not being within the floodplain outside flood zones two and three. More specifically, they have a 1 in 1,000 chance of flooding annually. Zone 1 areas have a low probability of flooding. There are four classifications for flood zones How Are Flood Zones (in England) Classified? If the property site is located in a flood zone, you will require a flood risk assessment, even if it is for a small development such as an extension or the addition of a conservatory. ![]() Failure to complete a flood risk assessment before the submission of your planning application may lead to your application being refused. Since new regulations were implemented in April 2015, more and more planning applicants have been discovering that they need a flood risk assessment (FRA) for property development planning and construction.įor comprehensive flood risk assessments that cover all key areas, it is advisable to find a flood risk specialist or engineer to complete the assessment for you.
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