FloodRadar
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Up to Low likelihood
Properties in BH20 5JH sit in the Environment Agency's Low 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% | 0 | 0 |
| Medium | 1% – 3.3% | 0 | 0 |
| Low | 0.1% – 1% | 6 | 2 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a low-likelihood area has a 2–22% chance of flooding at least once.
BH20 5JH gets about 968 mm of rain a year on average (wettest month November, 121 mm; driest May, 52 mm). That is 17% 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), 1.7 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 38 m above sea level and falls 34 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-south-west, 19.8 m higher.
Because properties in the low likelihood band; 626 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BH20 5JH. 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, 59 warnings nearby) · Brendan (2020, 7 warnings nearby) · Ciaran (2023, 6 warnings nearby) · Henk (2024, 6 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Swanage Prospect Farm Swan Brook | Swan Brook | 5.0 km | 0.65 m | 1.31 m |
| Swanage King Georges Field St Marys Church | Swan Brook | 5.8 km | 0.45 m | 0.55 m |
| Poole Harbour | Dorset Coast | 7.8 km | — | 1.64 m |
| BAGGS MILL | — | 8.8 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 |
|---|---|---|---|---|
| Corfe Castle Stw | Corfe River (s) | 2.9 km | 54 (2024) | 530 |
| Red Lane Pumping Station | Trib Of Corfe River (s) | 3.0 km | 8 (2024) | 34 |
| Studland Road Pumping Station | Corfe River | 3.0 km | 14 (2024) | 15 |
| Harman's Cross Pumping Station | Unnamed Stream (s) | 3.3 km | 15 (2024) | 80 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
No mapped flood-defence assets within 500 m of the postcode centre. 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 BH20 5JH — all in the BH20 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. 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 BH20 district.