- Are waves included in the Coastal Flood Boundaries?
- Coastal Flood Boundaries - additional help and further information
- How are levels within ‘Inland Extensions’ or ‘Estuaries’ derived?
- How can I generate my Base Tide Curves?
- How does the Coastal Flood Boundaries inform us about flood risk around the UK coast?
- How is sea level rise accounted for in the Coastal Flood Boundaries?
- How often is the Coastal Flood Boundaries dataset updated?
- How should I use Coastal Flood Boundaries levels in estuaries and tidal rivers?
- I am concerned about the large differences in values in some locations and the effects on my project
- I’ve been given mean high water springs (MHWS) and highest astronomical tide (HAT) predicted Tide Levels by another source. They don’t match up to those in the Coastal Flood Boundaries. Which should I use?
- Levels have fallen in my area of interest since the previous Coastal Flood Boundaries update. How can this be when sea levels are known to be rising?
- What are the Coastal Flood Boundaries?
- What are the key outputs of Coastal Flood Boundaries 2018?
- What has been done to update the Coastal Flood Boundaries in 2018?
- What has changed in Coastal Flood Boundaries 2018?
- What information is included in the extreme sea levels shapefiles?
- What is meant by Annual Exceedance Probability (AEP) and which extreme sea level probabilities are included?
- What is the accuracy of the Coastal Flood Boundaries extreme sea levels?
- What is the base year for Coastal Flood Boundaries levels?
- What is the vertical datum of the Coastal Flood Boundaries Level?
- Where can I access the Coastal Flood Boundaries data and guidance documents?
- Who should use the Coastal Flood Boundaries (CFB) data?
- Why are regular updates, and therefore likely change in the estimates, necessary?
Why are regular updates, and therefore likely change in the estimates, necessary?
Created: 03 October 2019 Updated: 03 October 2019
The CFB represents the best available information on extreme sea levels within the UK. The methods used in the extreme value analysis are internationally pioneering and are best on the best available tide gauge data. To maintain this high standard, regular updates are required to reflect the most recent improvements in sea level science and newly available gauge information.
Even if there are no significant tidal flood events in the eight year update period, the results are expected to change if they are re-analysed. Changes are primarily due to differences in data, improvements to the statistical methods and understanding of spatial variation between tide gauges.
Changes in levels may be problematic to some users and decisions makers. To make these changes manageable, an eight year period of stability is considered practical for most purposes.