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Flood risk · Harnham

Flood risk for Harnham

Indicative risk for the kilometre square around the centre, from the Environment Agency’s national flood risk assessment. Always check a specific property address on the official map before buying or building.

River & sea flooding
High
High
27.7%
Medium
0.1%
Low
19.1%
Very low
0%
Surface water flooding
Very low
High
0.2%
Medium
0.7%
Low
2.7%
Nearest watercourse
River Nadder
A river, 461 m from the centre of Harnham
For a property-specific flood risk check, use the official Environment Agency service at check-long-term-flood-risk.service.gov.uk.

Environment Agency National Flood Risk Assessment (NaFRA2, January 2025): the level shown is the highest risk that applies to at least 5% of the 1 km square centred on Harnham; bars show each level’s share of that square. Nearest named watercourse from OS Open Rivers. Contains Environment Agency and Ordnance Survey data, Open Government Licence.