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Does New Denham flood?

Buckinghamshire
22postcodes in the EA rivers-and-sea dataset
12river gauges within 10 km
14years with a mapped flood record within 5 km
🏠 Thinking of buying in New Denham? Get the detailed Property Flood-Risk Report for any New Denham postcode — official risk band, recorded floods since 1703, warning history, river behaviour and nearby storm overflows. £19 one-off, instant. Learn more →

What the Environment Agency's rivers-and-sea flood-risk data says about New Denham

Ordnance Survey places 22 postcodes in New Denham in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 201 properties in the EA dataset's likelihood bands.

EA likelihood bandPostcodes (worst band)Properties in the EA datasetof which homes
High31910
Medium13111108
Low24436
Very low42722
All bands22201176

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near New Denham

Environment Agency gauges within 10 km of New Denham watch Frays River, River Colne, River Misbourne, River Pinn, Yeading Brook, Cannon Brook.

Distances are from the middle of New Denham's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

The watercourse nearest New Denham

The nearest watercourse on the river map is the River Colne, about 60 m from the middle of New Denham's at-risk postcodes. It flows into the River Thames about 17 km downstream.

A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on the River Colne nearest the middle of New Denham's at-risk postcodes. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.

Flood warning areas near New Denham

23 Environment Agency flood warning areas lie within 10 km of New Denham. The EA has issued 275 flood warnings and alerts for them since 2006, most recently on 28 Aug 2026.

Recorded floods near New Denham

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of New Denham, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

…and 8 earlier recorded floods on the map.

Rainfall near New Denham

New Denham gets about 676 mm of rain a year on average (wettest month November, 76 mm; driest March, 42 mm). That is 42% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 3.5 km from the place centre.

At-risk postcodes in New Denham

Every postcode Ordnance Survey places in New Denham that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (3)

UB9 4AFUB9 4BSUB9 4DQ

Medium likelihood (13)

UB9 4AGUB9 4AHUB9 4AJUB9 4ALUB9 4ANUB9 4APUB9 4AQUB9 4ARUB9 4AUUB9 4AWUB9 4AYUB9 4AZUB9 4DA

Low likelihood (2)

UB9 4ATUB9 4BT

Very low likelihood (4)

UB9 4BEUB9 4DHUB9 4DNUB9 4DY

Postcode districts

UB9 · 22

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.

Flood-risk bands: © 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, flood warning areas and warning history © Environment Agency copyright and/or database right 2025. Licensed under the Open Government Licence v3.0.

River levels and rainfall: Environment Agency real-time flood-monitoring data, updated every 15 minutes (Open Government Licence v3.0).

Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.

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.

All data sources & licences