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Chatham, Medway
Up to Low likelihood
Properties in ME4 4YJ 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% | 2 | 0 |
| 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.
ME4 4YJ gets about 644 mm of rain a year on average (wettest month October, 70 mm; driest March, 39 mm). That is 45% 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), 1.7 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 4 m above sea level and falls 67 m across the surrounding 800 m. Surface water reaching this point runs off ground lying to the east-north-east, 58.2 m higher.
Because properties in the low likelihood band; 181 official warnings since 2006.
The map above shows the real EA rivers & sea likelihood cells around ME4 4YJ. 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.
None mapped within ~1 km of this postcode's centre.
No recorded outline near this postcode means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. The full report tests every other flood source at the exact building.
Franklin (2022, 5 warnings nearby) · Kathleen (2024, 3 warnings nearby) · Corrie (2022, 2 warnings nearby) · Brendan (2020, 2 warnings nearby)
| Gauge | River | Distance | Typical high | Highest on record |
|---|---|---|---|---|
| Allington Marina | River Medway | 10.2 km | 0.50 m | 1.08 m |
| EAST FARLEIGH GS | — | 14.2 km | — | — |
| Riddles Lane | Groundwater Level | 14.2 km | 23.17 m | 25.93 m |
| East Farleigh Gate Upstream | River Medway | 14.4 km | 1.71 m | 5.38 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 |
|---|---|---|---|---|
| Ridgeway Banks Chatham Cso | The River Medway | 0.5 km | 7 (2024) | 1 |
| Magpie Hall Road Chatham Outside 33 | River Medway Estuary | 0.5 km | 38 (2024) | 19 |
| Cso Hopwell Drive (chatham) | The River Medway Estuary | 0.5 km | 0 (2024) | 0 |
| Magpie Hall Road Outside 60 Cso | The River Medway Estuary | 0.5 km | 0 (2024) | 0 |
Official annual EDM figures — a water-quality signal for local watercourses, not a property flood-risk factor.
2 mapped flood-defence assets within 500 m — nearest ~467 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 ME4 4YJ — all in the ME4 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 ME4 district.