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Calne, Wiltshire
Up to Low likelihood
Properties in SN11 8EA 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.
The ground here sits at about 78 m above sea level and falls 32 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the north-north-east, 2.7 m higher.
Because properties in the low likelihood band; 5 recorded floods nearby; 42 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around SN11 8EA. 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 |
|---|---|---|
| Feb 1990 | This represents flooding in the area in 1990 | ~1.0 km |
| Dec 1989 | This represents flooding in the area in 1989 | ~0.7 km |
| Dec 1988 | This represents flooding in the area in 1988 | ~0.7 km |
| Dec 1960 | This represents flooding in the area in 1960 | ~0.5 km |
| May 1932 | EA112_Avon_Chippenham_Calne | ~5.3 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, 3 warnings nearby) · Henk (2024, 3 warnings nearby) · Bram (2025, 1 warnings nearby) · Herminia (2025, 1 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Calne | River Marden | 0.6 km | 0.48 m | 1.28 m |
| Stanley | River Marden | 5.3 km | 1.10 m | 3.45 m |
| Winterborne Monkton | River Kennet | 9.7 km | 1.11 m | 2.33 m |
| Melksham Clackers | Clackers Brook | 11.0 km | 0.60 m | 1.47 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 |
|---|---|---|---|---|
| Patford Street Cso | River Marden | 0.6 km | 32 (2024) | 111 |
| Wood Street Combined Sewer Overflow | River Marden Via Sws | 0.6 km | 2 (2024) | 0 |
| The Strand Cso | River Marden | 0.6 km | 24 (2024) | 25 |
| Market Hill Cso | River Marden Via Sws | 0.6 km | 2 (2024) | 0 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
38 mapped flood-defence assets within 500 m — nearest ~59 m (natural 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 SN11 8EA — all in the SN11 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 SN11 district.