Risk of flooding from rivers and sea
River flooding happens when a river cannot cope with the amount of water draining into it from the surrounding land. Sea flooding happens when there are high tides and stormy conditions.
The shading on the map shows the risk of flooding from rivers and the sea in this particular area.
- Definition of main river
- High risk of flooding from rivers and sea
- Medium risk of flooding from rivers and sea
- Low risk of flooding from rivers and sea
- Very low risk of flooding from rivers and sea
Flood alerts and warnings (detailed view)
In many areas we issue flood alerts and warnings for flooding from rivers and the sea. Select 'detailed view' on the map option to see areas that that can receive free flood warnings.
- We issue flood alerts when flooding is possible. If you receive a flood alert you should be prepared for flooding and to take action.
- We issue flood warnings to specific areas when flooding is expected. If you receive a flood warning you should take immediate action.
Floods can happen anywhere at any time. Sign up for our free flood warning service and ensure you are prepared and know what to do when a flood happens.
- What to do before a flood
- What to do during and after a flood
- Sign up for free flood warnings
- View the flood warnings currently in force
Risk of flooding from surface water
Surface water flooding happens when rainwater does not drain away through the normal drainage systems or soak into the ground, but lies on or flows over the ground instead.
The shading on the map shows the risk of flooding from surface water in this particular area.
- High risk of flooding from surface water
- Medium risk of flooding from surface water
- Low risk of flooding from surface water
Flooding from reservoirs (detailed view)
Reservoir flooding is extremely unlikely to happen.
Select 'detailed view' to see the layer for flooding that could occur from reservoirs. The shading on the map shows the worst-case scenario for the area that could be flooded if a large reservoir were to fail and release the water it holds. A large reservoir is one that holds over 10,000 cubic metres of water, equivalent to approximately 4 Olympic sized swimming pools.
The reservoir flood maps do not indicate any likelihood of a flood occurring.
- More about flooding from reservoirs
Shoreline management plan
The coloured lines represent preferred management approaches – or ‘policies’ – that are detailed in your local Shoreline Management Plan.