FloodRadar
Log inCreate free account
FloodRadar
Log inCreate free account
Up to High likelihood
Properties in BH20 4JD 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% | 4 | 0 |
| Medium | 1% – 3.3% | 2 | 1 |
| Low | 0.1% – 1% | 2 | 1 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a high-likelihood area has at least a 57% chance of flooding at least once.
BH20 4JD gets about 853 mm of rain a year on average (wettest month November, 108 mm; driest July, 47 mm). That is 27% 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), 1.1 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 2 m above sea level and falls 5 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north, 1.2 m higher.
Because properties in the high likelihood band; 2 recorded flood outlines mapped nearby; 619 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BH20 4JD. 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.
| Date | Mapped flood extent | Approx. distance |
|---|---|---|
| Jan 2014 | Flood Extents_Winter 2013 to 2014 | ~2.4 km |
| Jan 1959 | Jan 1959 Avon & Frome | ~0.9 km |
These are extents the Environment Agency has mapped, not a list of every flood. Records, not floods: no outline on the record is not evidence a place has not flooded. The full report tests whether any extent covered the exact spot.
2013-14 UK winter floods (2013, 56 warnings nearby) · Brendan (2020, 7 warnings nearby) · Henk (2024, 6 warnings nearby) · Herminia (2025, 5 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| BAGGS MILL | — | 2.2 km | — | — |
| East Stoke | River Frome | 6.9 km | 1.42 m | 1.93 m |
| Poole Harbour | Dorset Coast | 7.8 km | — | 1.64 m |
| STURMINSTER MARSHALL MAGGS BRIDGE | — | 11.8 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 |
|---|---|---|---|---|
| Wareham Wastewater Treatment Works | Tidal River Piddle | 0.7 km | 26 (2024) | 78 |
| South East Pumping Station | River Frome (estuarine) | 1.2 km | 12 (2024) | 19 |
| Stoborough Ridge Pumping Station | Tributary Of River Frome | 1.3 km | 10 (2024) | 39 |
| — | 1.4 km | 10 (2024) | 12 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
3 mapped flood-defence assets within 500 m — nearest ~250 m (embankment). 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 4JD — 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.