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Does DT5 1AT flood?

Up to High likelihood

Properties in DT5 1AT 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 bandAnnual chancePropertiesOf which homes
Highgreater than 3.3%11
Medium1% – 3.3%10
Low0.1% – 1%00
Very lowbelow 0.1%11

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 around DT5 1AT

The ground here sits at about 12 m above sea level and falls 88 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east, 31.5 m higher.

Shaded relief map of the ground around DT51AT, computed from Environment Agency LiDAR. The ground here sits at about 12 m above sea level and falls 88 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east, 31.5 m higher.
Shaded relief of the bare ground within about 400 m of DT5 1AT, 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 DT5 1AT — £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 DT5 1AT

FloodRadarProperty Flood-Risk Report
DT5 1AT
Elevated flood risk — professional assessment recommended

Because properties in the high likelihood band; 4 recorded floods nearby; 265 official warnings since 2006.

E 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 High
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 DT5 1AT. 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 DT5 1AT

265
flood alerts & warnings within 10 km since 2006
189
of them full flood warnings or severe warnings
2026
most recent warning nearby (2026-02-18)

Warnings cover flood areas, not individual addresses.

Recorded floods near this postcode

DateRecorded floodApprox. distance
Feb 2014 Chiswell_Winter 2013 to 2014 ~0.3 km
Jan 2014 Chiswell_Winter 2013 to 2014 ~0.2 km
Jan 2014 Chiswell_Winter 2013 to 2014 ~0.2 km
Feb 1979 Feb 1979 Chiswell ~1.0 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

2013-14 UK winter floods (2013, 67 warnings nearby) · Eunice (2022, 5 warnings nearby) · Ciaran (2023, 5 warnings nearby) · Imogen (2016, 4 warnings nearby)

The rivers that matter for DT5 1AT

GaugeRiverDistanceTypical highHighest on record
Chiswell Dorset Coast 0.3 km — 6.44 m
Portland Dorset Coast 1.1 km — 2.02 m
Broadwey River Wey 10.4 km 0.35 m 0.75 m
BROADWEY — 10.6 km — —

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
High Street Cso West Bay (coastal) 0.3 km 17 (2024) 2
Victoria Square Portland Portland Harbour 0.9 km 13 (2024) 2
Weymouth Water Recycling Centre (c) English Channel 2.4 km 89 (2024) 463
Portland Railway Gravity Sewer Lyme Bay (c) 2.6 km 2 (2024) 0

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

Flood defences

8 mapped flood-defence assets within 500 m — nearest ~127 m (wall, flood gate, beach, embankment). 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

DT5 1AH up to High DT5 1AL up to High DT5 1AN up to High DT5 1AP up to High DT5 1AR up to High DT5 1AS up to High DT5 1AW up to High DT5 1AY up to High DT5 1AZ up to High DT5 1BD up to Low DT5 1BG up to High DT5 1BJ up to High

At-risk postcodes near DT5 1AT — all in the DT5 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. 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 DT5 district.