flood risk

The risk of flooding is classified by the Environment Agency into three categories, from low (<1 in 200 chance of flooding in any one year) to significant (>1 in 75 in any one year). In England, over 2.4M properties are at risk of flooding from rivers or the sea, some of which are also at risk from surface water flooding, and a further 2.8M are at risk from surface water flooding only (total 5.2M, or 1 in 6 properties).

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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