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Romsey, Hampshire
Up to Very low likelihood
Properties in SO51 7RY sit in the Environment Agency's Very 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% | 0 | 0 |
| Very low | below 0.1% | 1 | 1 |
Over a 25-year mortgage, a property in a very low-likelihood area has less than a 3% chance of flooding at least once.
SO51 7RY gets about 860 mm of rain a year on average (wettest month November, 106 mm; driest July, 50 mm). That is 26% 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 18 m above sea level and falls 7 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south, 4.1 m higher.
Two mapped watercourses are about the same distance from the centre of SO51 7RY: Holbrook Stream (Fish Lake) (about 270 m) and Oxlease Drain (about 290 m), so this page cannot say which one is nearer to you.
Distances along the river are from the point on each watercourse nearest the centre of SO51 7RY. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Because properties in the very low likelihood band; 6 recorded flood outlines mapped nearby; 489 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around SO51 7RY. 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 |
|---|---|---|
| Feb 2014 | River Test Aerial Photography | ~1.4 km |
| Feb 2014 | Mill Lane, Romsey, Winter 13/14 | ~1.0 km |
| Feb 2014 | Greatbridge Road, Romsey, Winter 13/14 | ~0.6 km |
| Feb 2014 | Fishlake Meadows Road, Romsey, Winter 13/14 | ~0.3 km |
| Feb 2014 | Sadlers Mill, Romsey, Winter 13/14 | ~1.3 km |
| Feb 2014 | World of Water, Romsey, Winter 13/14 | ~0.7 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, 80 warnings nearby) ▶ replay it here · Dennis (2020, 19 warnings nearby) ▶ replay it here · Henk (2024, 18 warnings nearby) ▶ replay it here · Bert (2024, 12 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Fishlake | Fishlake Stream | 0.4 km | 0.77 m | 1.04 m |
| Oxlease | River Test | 0.4 km | 16.00 m | 16.26 m |
| Plaza Grill | Barge Canal | 0.5 km | 17.60 m | 17.84 m |
| Brewery Grill | Oxlease Drain | 0.5 km | 17.37 m | 17.37 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 |
|---|---|---|---|---|
| The Hundred Romsey Cso | Tadburn Lake | 0.9 km | 4 (2024) | 11 |
| Eight Acres Romsey Cso | Tadburn Lake | 1.0 km | 0 (2024) | 0 |
| Memorial Park Romsey Ceo | River Test | 1.3 km | 4 (2024) | 33 |
| Romsey Wwtw | The River Test | 1.4 km | 68 (2024) | 959 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
23 mapped flood-defence assets within 500 m — nearest ~208 m (embankment, natural high ground, wall, 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 SO51 7RY — all in the SO51 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 (England); live overflow status © the water companies, incl. Dŵr Cymru Welsh Water and Scottish Water. 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 SO51 district.