Does Amersham flood?

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

Ordnance Survey places 25 postcodes in Amersham 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 298 properties in the EA dataset's likelihood bands.

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 Amersham

Environment Agency gauges within 10 km of Amersham watch River Misbourne, River Chess.

• Missenden
  River Misbourne · 2.9 km away 0.12 m
  normal range · steady · 25 min ago
• Chesham
  River Chess · 4.1 km away 0.33 m
  normal range · steady · 25 min ago

Distances are from the middle of Amersham'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.

Flood warning areas near Amersham

9 Environment Agency flood warning areas lie within 10 km of Amersham. The EA has issued 5 flood warnings and alerts for them since 2006, most recently on 2 Mar 2024.

• The River Misbourne at Amersham, including Amersham Old Town, from Little Missenden to Chalfont St Giles
  no warning on record since 2006 0.1 km
• The River Chess at Chesham
  no warning on record since 2006 3.5 km
• The River Chess at Chenies, including Latimer and Sarratt
  no warning on record since 2006 5.2 km
• The River Chess at Chesham, Chenies and Loudwater
  2 warnings and alerts since 2006, latest Mar 2024 5.4 km
• The River Misbourne at Great Missenden, Amersham and The Chalfonts
  no warning on record since 2006 6.0 km
• Areas at risk of groundwater flooding in and around Chesham
  2 warnings and alerts since 2006, latest Feb 2024 6.2 km
• The River Misbourne at The Chalfonts including Chalfont St Giles, Chalfont St Peter and Denham
  no warning on record since 2006 9.1 km
• The River Colne at Rickmansworth including Batchworth, Money Hill and Maple Cross
  1 warning or alert since 2006, latest Jan 2021 9.9 km
• Hughenden Stream from Hughenden Park to the confluence with The River Wye including parts of High Wycombe
  no warning on record since 2006 10.0 km

Recorded floods near Amersham

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

• 23 Feb 2024 — EA06FebruaryWinter2024 Main river
• 18 Mar 2014 — ea06MarchSpring2014 Main river
• 16 Mar 2014 — ea06MarchSpring2014 Main river
• 31 Jan 2014 — ea06FebruaryWinter2014 Main river
• 6 Jan 2014 — ea06JanuaryWinter2014 Drainage
• 24 Dec 2013 — ea06DecemberWinter2013 Drainage
• 23 Nov 2013 — Winter 2013/2014 Main river
• 1 Oct 2001 — 06OctoberAutumn2001 Main river

Rainfall near Amersham

Amersham gets about 794 mm of rain a year on average (wettest month November, 89 mm; driest March, 50 mm). That is 32% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.6 km from the place centre.

The nearest rain gauge, Rainfall station (6.3 km away), recorded 2.0 mm in the last 24 hours and 3.0 mm in the last 7 days (latest reading 26 min ago).

At-risk postcodes in Amersham

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

High likelihood (3)

Medium likelihood (4)

Low likelihood (18)

Postcode districts

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.