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Does SN15 2BB flood?

Chippenham, Wiltshire

Up to Medium likelihood

Properties in SN15 2BB sit in the Environment Agency's Medium 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 bandAnnual chancePropertiesOf which homes
Highgreater than 3.3%00
Medium1% – 3.3%40
Low0.1% – 1%00
Very lowbelow 0.1%00

Over a 25-year mortgage, a property in a medium-likelihood area has a 22–57% chance of flooding at least once.

The ground around SN15 2BB

The ground here sits at about 45 m above sea level and falls 23 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west, 21.7 m higher.

Shaded relief map of the ground around SN152BB, computed from Environment Agency LiDAR. The ground here sits at about 45 m above sea level and falls 23 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west, 21.7 m higher.
Shaded relief of the bare ground within about 400 m of SN15 2BB, computed from the Environment Agency's published LiDAR terrain survey. The ring marks the postcode centre, not a property. This shows the shape of the land, not a flood map — it does not include drains, culverts, walls or kerbs, and the official likelihood band above is the authoritative figure. © Environment Agency copyright and/or database right 2022. All rights reserved.
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Get the full flood report for SN15 2BB — £19 Free preview first · instant access · no account needed The detail below — flood history, warnings, rivers, overflows — is part of FloodRadar's property flood-risk report. The official band above is free; the preview shows more before you decide.

Inside the full report for SN15 2BB

FloodRadarProperty Flood-Risk Report
SN15 2BB
Moderate flood risk — investigate further

Because properties in the medium likelihood band; 6 recorded floods nearby; 273 official warnings since 2006.

D Today — indicative grade (A best → E)
··· By the 2050s — EA climate scenario (in the full report)
⚑ Official warning within 10 km: Yes ⚑ Recorded flood nearby: Yes ⚑ Flood defences within 500 m: Yes ⚑ In flood zone 2 or 3: ···
Rivers & sea
Up to Medium
Surface water
···
Groundwater
Not assessed
Historic flooding
Recorded nearby
Warning history · flood map with building picker · 2050s view · insurance outlook · every dataset receipt — 18 sections

Flood-risk map of this area

Environment Agency flood-likelihood cells
High (>3.3%/yr) Medium Low Very low Marker = postcode centre Base map © OpenStreetMap contributors

The map above shows the real EA rivers & sea likelihood cells around SN15 2BB. 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.

Official flood warnings near SN15 2BB

273
flood alerts & warnings within 10 km since 2006
70
of them full flood warnings or severe warnings
2026
most recent warning nearby (2026-03-12)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

DateRecorded floodApprox. distance
Nov 2012 Chippenham_Nov 2012 ~0.2 km
Apr 2012 EA112_Avon_April_Flood Event ~6.2 km
Feb 2009 North Wessex Feb 2009 ~5.2 km
Oct 2000 This represents flooding in the area in 2000 ~0.5 km
Oct 1999 This represents flooding in the area in 1999 ~0.6 km
Jan 1999 This represents flooding in the area in 1999 ~0.6 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.

Named storms that brought flooding here

Bert (2024, 7 warnings nearby) · Henk (2024, 6 warnings nearby) · Christoph (2021, 4 warnings nearby) · Babet (2023, 3 warnings nearby)

The rivers that matter for SN15 2BB

GaugeRiverDistanceTypical highHighest on record
Stanley River Marden 3.6 km 1.10 m 3.45 m
Corsham River Avon 6.1 km 0.30 m 0.89 m
Melksham Shaw South Brook 8.1 km 0.80 m 1.71 m
Calne River Marden 8.2 km 0.48 m 1.28 m

Live levels, predictions and rain-response behaviour are on each gauge's page and in the property report.

Storm overflows within 5 km

OverflowDischarges intoDistanceSpillsHours
Cso O/s 29 High Street River Avon(s) 0.0 km 63 (2024) 167
Monkton Park Offices Cso River Avon 0.2 km 19 (2024) 96
Charter Road Cso River Avon 0.3 km 2 (2024) 3
Dallas Road Combined Sewer Overflow Hardenhuish Brook 0.4 km 0 (2024) 0

Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.

Flood defences

19 mapped flood-defence assets within 500 m — nearest ~12 m (natural high ground, engineered high ground). Defences reduce risk, never remove it.

What the full property report adds

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.

Flood risk at nearby postcodes

SN15 2AB up to Medium SN15 2AD up to Medium SN15 2AE up to Medium SN15 2DJ up to Medium SN15 2JU up to High SN15 2LB up to High SN15 2LD up to High SN15 2LT up to High SN15 2LY up to High SN15 2NF up to High SN15 2NR up to High SN15 2NU up to Medium

At-risk postcodes near SN15 2BB — all in the SN15 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 SN15 district.