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This publication is available at https://www.gov.uk/government/publications/preliminary-flood-risk-assessments-and-flood-risk-areas/preliminary-flood-risk-assessments-and-flood-risk-areas
Each stage of the planning cycle must be reviewed every 6 years and updated if required.
1. Preliminary flood risk assessments and flood risk areas
Preparing preliminary flood risk assessments and flood risk area maps is the first stage in a 6 year planning cycle to manage flood risk.
1.1 Preliminary flood risk assessments (PFRAs)
A PFRA is an assessment of:
- floods that have taken place in the past
- floods that could take place in the future
The Environment Agency and lead local flood authorities (LLFAs) use PFRAs to identify areas that are at risk of significant flooding. These areas are called flood risk areas.
PFRA for main rivers, the sea and reservoirs
The Environment Agency is responsible for the PFRA and identifying flood risk areas for main rivers, the sea and reservoirs in England.
PFRAs for local sources of flood risk
LLFAs are responsible for the PFRA and identifying flood risk areas for local sources of flood risk in their administrative areas. Local sources of flood risk are surface water, groundwater and small watercourses.
There are 152 LLFAs in England. The LLFA PFRAs are grouped by river basin district.
- Anglian River Basin District PFRAs
- Humber River Basin District PFRAs
- Northumbria River Basin District PFRAs
- North West River Basin District PFRAs
- Severn River Basin District PFRAs
- South East River Basin District PFRAs
- South West River Basin District PFRAs
- Thames River Basin District PFRAs
Dee River Basin District LLFA PFRAs
The Dee River Basin District lies partly in England and partly in Wales.
Information for the English part of the Dee River Basin District is in the PFRAs for:
You can find information about flood risk planning in Wales on the Natural Resources Wales website.
Solway Tweed River Basin District LLFA PFRAs
Most of the Solway Tweed River Basin District is in Scotland.
You can find information about flood risk planning in Scotland on the SEPA website.
The English parts of the Solway Tweed River Basin District are the:
- Eden, Waver and Wampool catchments, which drain into the Solway Firth
- River Till in the River Tweed catchment
Information on these areas is included in the LLFA PFRAs for:
1.2 Flood risk areas
Flood risk areas are areas where the risk of flooding is likely to be significant for people, the economy, the environment or cultural heritage. For each flood risk area the Environment Agency or LLFA must prepare:
- a flood hazard map and a flood risk map
- a flood risk management plan (FRMP)
2. Mapping flood hazard and risk
Flood hazard maps show the probability or likelihood of flooding occurring in a location.
View the long term flood risk information to see the likelihood of flooding in a particular area or postcode.
Flood risk maps show the risk to people, economic activity and the environment in an area.
View the flood risk maps published in 2013.
The Environment Agency and LLFAs use the flood hazard maps and flood risk maps to prepare the flood risk management plans. The maps must be updated every 6 years.
3. Flood risk management plans (FRMPs)
- explain the risk of flooding from rivers, the sea, surface water, groundwater and reservoirs
- set out how risk management authorities will work with communities to manage flood risk
FRMPs must be reviewed and updated every 6 years.
Read the FRMPs: 2015 to 2021.