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Chelworth Lower Green, Wiltshire
Up to Low likelihood
Properties in SN6 6HE 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% | 15 | 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.
SN6 6HE gets about 735 mm of rain a year on average (wettest month December, 78 mm; driest March, 48 mm). That is 37% 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), 0.7 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 87 m above sea level and falls 12 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the south-east, 6.0 m higher.
The river map has no watercourse within 1 km of the centre of SN6 6HE.
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; 258 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around SN6 6HE. 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 1992 | 06SeptemberAutumn1992 | ~1.3 km |
| Jan 1968 | 06SeptemberAutumn1968 | ~1.3 km |
| Jan 1947 | 06MarchSpring1947 | ~15.2 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, 10 warnings nearby) ▶ replay it here · Bert (2024, 7 warnings nearby) ▶ replay it here · Babet (2023, 5 warnings nearby) ▶ replay it here · Herminia (2025, 4 warnings nearby) ▶ replay it here
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Purton Stoke | River Key | 1.9 km | 1.89 m | 2.34 m |
| Water Eaton | River Ray | 4.0 km | 1.90 m | 2.68 m |
| South Cerney | River Churn | 6.1 km | 1.31 m | 1.47 m |
| Somerford Keynes | River Thames | 6.7 km | 1.60 m | 1.59 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 |
|---|---|---|---|---|
| Cricklade Wwtw | Tributary Of The River Thames | 2.8 km | 107 (2024) | 1,378 |
| Hatchetts Sps | Tributary Of The River Thames | 2.8 km | 56 (2024) | 698 |
| Purton Wwtw | Tributary Of River Key | 3.1 km | 53 (2024) | 627 |
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 SN6 6HE — all in the SN6 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 SN6 district.