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Up to Low likelihood
Properties in YO51 9HB 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% | 1 | 1 |
| 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.
YO51 9HB gets about 643 mm of rain a year on average (wettest month August, 66 mm; driest March, 39 mm). That is 45% 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), 2.1 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 16 m above sea level and falls 20 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-south-west, 0.8 m higher.
The river map has no watercourse within 1 km of the centre of YO51 9HB.
That means this spot is not on the river map, not that there is no water here: Ordnance Survey’s river map (OS Open Rivers) leaves out small streams, ditches and culverts. Contains OS data © Crown copyright and database rights 2026.
Because properties in the low likelihood band; 3 recorded flood outlines mapped nearby; 382 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around YO51 9HB. 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 2021 | 2021 January Flood Incident - Storm Christoph | ~35.6 km |
| Feb 2020 | 2020 February Flood Incident - Storm Dennis | ~10.5 km |
| Feb 2020 | 2020 February Flood Incident - Storm Ciara | ~7.3 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, 12 warnings nearby) ▶ replay it here · Dennis (2020, 9 warnings nearby) ▶ replay it here · Desmond (2015, 9 warnings nearby) ▶ replay it here · Christoph (2021, 8 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Boroughbridge | River Tutt | 2.1 km | 13.60 m | 14.18 m |
| Boroughbridge | River Ure | 2.1 km | 14.20 m | 15.79 m |
| Myton-On-Swale | River Swale | 2.5 km | 5.25 m | 6.29 m |
| Aldwark Bridge | River Ure | 6.4 km | 2.30 m | 5.17 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 |
|---|---|---|---|---|
| Aldborough Sso | Low Commondrain | 0.3 km | 1 (2025) | 0 |
| Boroughbridge Stw | Unnamed Trib Of Ure | 1.6 km | 75 (2025) | 989 |
| New Row Combined Sewer Overflow | River Tutt | 2.0 km | 30 (2024) | 77 |
| Milby Island Sps | River Ure | 2.3 km | 2 (2025) | 19 |
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.
Flooded here before? Log it and see what your floods had in common.
At-risk postcodes near YO51 9HB — all in the YO51 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 (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 YO51 district.