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Barton on Sea, Hampshire
Up to Low likelihood
Properties in BH25 7BN 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% | 2 | 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.
BH25 7BN gets about 798 mm of rain a year on average (wettest month November, 105 mm; driest July, 46 mm). That is 31% 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), 2.0 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 28 m above sea level and falls 11 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west, 8.6 m higher.
Because properties in the low likelihood band; 3 recorded flood outlines mapped nearby; 468 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around BH25 7BN. 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 |
|---|---|---|
| Dec 1993 | 30/12/93_Becton Bunny_Barton-on-Sea(2) | ~0.1 km |
| Dec 1993 | 30/12/93_Becton Bunny_Barton-on-Sea(3) | ~0.1 km |
| Dec 1993 | 30/12/93_Becton Bunny_Barton-on-Sea(1) | ~0.4 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, 61 warnings nearby) · Eleanor (2018, 6 warnings nearby) · Herminia (2025, 5 warnings nearby) · Kathleen (2024, 5 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Chewton Glen | Walkford Brook | 1.7 km | 1.23 m | 1.23 m |
| CHEWTON GLEN GS | — | 1.7 km | — | — |
| New Valley Road | Danes Stream | 4.6 km | 0.75 m | 0.79 m |
| Milford Bridge | Danes Stream | 5.1 km | 1.90 m | 1.88 m |
Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.
| Overflow | Discharges into | Distance | Spills | Hours |
|---|---|---|---|---|
| Sunnyfield Road Barton-on-sea Cso | Beckton Bunny | 0.0 km | 0 (2024) | 0 |
| Friars Walk Barton-on-sea Cso | Becton Bunny | 0.1 km | 0 (2024) | 0 |
| Becton Lane Barton On Sea Ceo | English Channel | 1.3 km | 5 (2024) | 21 |
| Sky End Lane Hordle Cso | Lymore Stream | 3.8 km | 0 (2024) | 0 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
10 mapped flood-defence assets within 500 m — nearest ~10 m (natural high ground, engineered high ground). 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 BH25 7BN — all in the BH25 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 BH25 district.