Flood risk map

Last warning issued

Mon, 10 Apr 2017 09:01:01

Flood risk map

Use this map to check your long term risk of flooding from rivers and sea, surface water and reservoirs.


You can also look to see which areas are eligible to receive flood warnings.

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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.

Flood alerts and warnings

In many areas we issue flood alerts and warnings for flooding from rivers and the sea. If your home or business is within a shaded area on the map then you 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.

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.

Risk of flooding from reservoirs

Reservoir flooding is extremely unlikely to happen.

The shading on the map shows 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 25,000 cubic metres of water, equivalent to approximately 10 Olympic sized swimming pools. Since this is a worst case scenario, it’s unlikely that any actual flood would be this large. 

Shoreline management plan

The coloured lines represent preferred management approaches – or ‘policies’ – that are detailed in your local Shoreline Management Plan. 

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