The following maps identify the current Flood Zones outside Horley, which are described below in more detail.

The Horley Flood Study 2004 covers the Horley area and is shown on the Proposals Map – South Sheet. This provides more detailed local information than the national Flood Zones. Also shown on that sheet is the worst case historical flood extent in Horley, for which the extent may not have been recorded at the peak of the flood event, or if some areas do not fall within the flood extent envelopes this could be due to no information having been recorded in the area, as opposed to these areas not flooding.

Flood Zones

Flood Zones are indicative flood maps produced by the Environment Agency. They are used by local planning authorities for consultation with the Agency on development proposals that are at risk from flooding, in accordance with PPG25 – Development and Flood Risk (2001). These zones show the extent of the natural floodplain as if there were no flood defences or certain other manmade structures and channel improvements. There are two different kinds of areas shown:

Flooding from rivers without defences this area could be flooded from a river by a flood that has a 1% (1 in 100) or greater chance of happening.

Extent of extreme flood – the additional extent of an extreme flood from rivers. These outlying areas are likely to be affected by a major flood, with up to a 0.1% (1 in 1000) chance of occurring each year.

To check for the latest information please visit

Environment Agency Flood Map 2005 Central

central flood map

Environment Agency Flood Map 2005 South

south flood map

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