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Lydney, Gloucestershire
Up to Medium likelihood
Properties in GL15 5RT 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 band | Annual chance | Properties | Of which homes |
|---|---|---|---|
| High | greater than 3.3% | 0 | 0 |
| Medium | 1% – 3.3% | 6 | 6 |
| Low | 0.1% – 1% | 13 | 8 |
| Very low | below 0.1% | 0 | 0 |
Over a 25-year mortgage, a property in a medium-likelihood area has a 22–57% chance of flooding at least once.
The ground here sits at about 11 m above sea level and falls 40 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the west, 13.8 m higher.
Because properties in the medium likelihood band; 5 recorded floods nearby; 369 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around GL15 5RT. 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 |
|---|---|---|
| Oct 2000 | Lydney | ~0.3 km |
| Oct 2000 | November 2000 (Lower Severn) | ~0.3 km |
| Dec 1981 | Tidal Severn | ~3.6 km |
| Jul 1968 | Severn Estuary | ~6.7 km |
| Jul 1968 | July 1968 (Lower Severn) | ~0.8 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.
2013-14 UK winter floods (2013, 26 warnings nearby) · Imogen (2016, 4 warnings nearby) · Eleanor (2018, 3 warnings nearby) · Kathleen (2024, 2 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Lydney | River Lyd | 0.5 km | 0.70 m | 1.60 m |
| Parkend | River Lyd | 4.7 km | 0.60 m | 1.35 m |
| Berkeley | Little Avon River | 6.5 km | 1.50 m | 2.30 m |
| Cambridge | River Cam | 11.6 km | 1.25 m | 1.38 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 |
|---|---|---|---|---|
| Tutnalls Street - Hams Road Cso | River Roden | 0.2 km | 24 (2024) | 29 |
| Lydney - East Marsh Sps | Tributary Of The Lyd | 0.6 km | 126 (2024) | 1,877 |
| Lydney - Church Road (cso) | River Lyd | 0.7 km | 85 (2024) | 367 |
| Lydney Sewage Treatment Works | River Severn Estuary | 2.6 km | 196 (2024) | 1,847 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
21 mapped flood-defence assets within 500 m — nearest ~147 m (natural high ground, engineered high ground, embankment, wall). 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 GL15 5RT — all in the GL15 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 GL15 district.