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Swanage, Dorset
Up to High likelihood
Properties in BH19 1AU sit in the Environment Agency's High flood-likelihood band (worst property). The band is the worst found in the postcode — it describes the land around properties (defence-adjusted, rivers & sea), not any single address, and not today's conditions.
| Likelihood band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 2 | 0 |
| Medium | 1% – 3.3% | 0 | 0 |
| Low | 0.1% – 1% | 2 | 0 |
| Very low | below 0.1% | 1 | 0 |
Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.
BH19 1AU gets about 905 mm of rain a year on average (wettest month December, 112 mm; driest May, 50 mm). That is 22% drier than the UK as a whole, which averages 1,163 mm a year.
A thirty-year average for the surrounding area, not a measurement at this address and not a flood risk on its own: a dry area floods when a storm sits over it, and a wet one may drain away perfectly well. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.9 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
The ground here sits at about 8 m above sea level and falls 31 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west-south-west, 1.3 m higher.
Because properties in the high likelihood band; 483 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BH19 1AU. The small panels are illustrative previews of the report's per-layer map views — the full report draws each layer for real, plus recorded extents, defences and a building picker on an interactive map.
Warnings cover flood areas, not individual addresses.
None mapped within ~1 km of this postcode's centre.
No recorded outline near this postcode means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. The full report tests every other flood source at the exact building.
2013-14 UK winter floods (2013, 50 warnings nearby) · Brendan (2020, 5 warnings nearby) · Callum (2018, 5 warnings nearby) · Ciara (2020, 4 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Swanage Prospect Farm Swan Brook | Swan Brook | 0.2 km | 0.65 m | 1.31 m |
| Swanage King Georges Field St Marys Church | Swan Brook | 0.9 km | 0.45 m | 0.55 m |
| Poole Harbour | Dorset Coast | 11.7 km | — | 1.64 m |
| BAGGS MILL | — | 13.4 km | — | — |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Herston Cross Attenuation Tank Cso | Trib Of River Swan(s) | 0.2 km | 3 (2024) | 9 |
| New Swanage Attenuation Tank | Ulwell Stream | 1.2 km | 10 (2024) | 28 |
| Durlston Road Ps | Unnamed Stream To Durlston Bay | 1.9 km | 44 (2024) | 50 |
| Swanage Tunnel | Swanage Bay | 2.4 km | 1 (2024) | 2 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
99 mapped flood-defence assets within 500 m — nearest ~87 m (embankment, natural high ground, engineered high ground, bridge abutment). Defences reduce risk, never remove it.
The interactive flood-risk map with a building picker (your exact house, not the postcode), the 2050s climate view, surface-water and planning flood zones at your building, exact recorded-flood distances, year-by-year warning charts, watercourses including culverted streams, an insurance outlook with the Flood Re rules, and a printable document with every dataset receipt — start with the free preview, unlock for £19.
At-risk postcodes near BH19 1AU — all in the BH19 district.
© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064. Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0. Recorded Flood Outlines and warning history © Environment Agency copyright and/or database right 2025. Storm-overflow figures: EA Event Duration Monitoring. Flood defences © Environment Agency (OGL v3). This page summarises public area-level data — it is not a flood-risk survey and not a substitute for the official GOV.UK service. All data sources & licences. More postcodes: the BH19 district.