FloodRadar
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Thornborough, Buckinghamshire
Up to High likelihood
Properties in MK18 2DN 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 | 4 |
| Medium | 1% – 3.3% | 1 | 1 |
| Low | 0.1% – 1% | 3 | 3 |
| 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.
The ground here sits at about 83 m above sea level and falls 30 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-west, 25.0 m higher.
Because properties in the high likelihood band; 1 recorded flood nearby; 39 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around MK18 2DN. 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 | Recorded flood | Approx. distance |
|---|---|---|
| Jan 1998 | Easter 1998 | ~2.3 km |
EA Recorded Flood Outlines — absence of a record never proves a place has not flooded. The full report tests whether any extent covered the exact spot.
Bert (2024, 5 warnings nearby) · Bram (2025, 2 warnings nearby) · Conall (2024, 2 warnings nearby) · Chandra (2026, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Thornborough | River Great Ouse | 2.1 km | 0.62 m | 1.24 m |
| Buckingham | River Great Ouse | 5.2 km | 0.53 m | 2.16 m |
| Stony Stratford | River Great Ouse | 7.7 km | 0.30 m | 1.16 m |
| Haversham | River Great Ouse | 11.5 km | 1.43 m | 2.98 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 |
|---|---|---|---|---|
| Buckingham (maids Moreton) Wrc | Ditch Trib River Great Ouse Nt | 2.4 km | 153 (2024) | 2,001 |
| Nash - Rear Of Church Sp | Claydon Brook-great River Ouse | 3.6 km | 5 (2024) | 31 |
| Great Horwood Stw | Horwood Brk/claydon Brk River | 4.0 km | 49 (2024) | 511 |
| Whaddon Ps | Beachampton Brook | 4.1 km | 70 (2024) | 1,013 |
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 MK18 2DN — all in the MK18 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 MK18 district.