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0.13

Greenham

Tone
Parrett, Brue and West Somerset Streams catchment • Greenham • Somerset • ID: 52108 • Level
(32m ago) • 3 readings/hr • 137 views

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Current Level
0.127 m
▬ Steady
24h Max
0.130 m
24h Min
0.127 m
Typical Range
0.15 - 1.30
m
Highest Recorded
4.37 m
10 Mar 2014
Since Nov 2012
Current level is 3% of this
🚽 Sewage overflows nearby

Recent Water Levels

🌍 floodradar.co.uk
1 day

Recent Readings

Falling · -0.2 cm over 6h
23 Aug 23:15 ▬ steady 0.127 m
23 Aug 23:00 ▬ steady 0.127 m
23 Aug 22:45 ▼ -0.1 cm 0.127 m
23 Aug 21:30 ▬ steady 0.128 m
23 Aug 21:15 ▬ steady 0.128 m
23 Aug 21:00 ▬ steady 0.128 m
23 Aug 20:45 ▬ steady 0.128 m
23 Aug 20:30 ▬ steady 0.128 m
23 Aug 20:15 ▬ steady 0.128 m
23 Aug 20:00 ▼ -0.1 cm 0.128 m
23 Aug 19:45 ▬ steady 0.129 m
23 Aug 19:30 ▬ steady 0.129 m
23 Aug 19:15 ▬ steady 0.129 m
23 Aug 19:00 ▬ steady 0.129 m
23 Aug 18:45 ▬ steady 0.129 m
23 Aug 18:30 ▬ steady 0.129 m
23 Aug 18:15 ▬ steady 0.129 m
23 Aug 18:00 ▬ steady 0.129 m
23 Aug 17:45 ▬ steady 0.129 m
23 Aug 17:30 0.129 m

Rainfall & Weather

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Flood history near this gauge

Official Environment Agency warnings issued since 2012 for the 5 flood areas linked to this gauge (nearest 2.5 km away).

27flood warnings 103flood alerts

Most recent flood warning: 27 Jan 2026River Tone from Waterrow to Taunton

Year by year
YearWarningsAlerts
2026 3 2
2025 1 7
2024 1 14
2023 3 16
2022 0 6
2021 1 7
2020 0 5
2019 0 7
2018 1 7
2017 0 4
2016 6 7
2015 0 3
2014 1 9
2013 1 9
2012 9 0

Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record. See also the Greenham flood history.

Nearby Stations

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Station Details

  • Monitoring Station: Greenham
  • Watercourse: River Tone
  • Nearest Town: Greenham
  • County: Somerset
  • Nearest reservoir: Clatworthy (12.0 km) · 68.0% full (as of 29 Jun 2026)
  • Coordinates: 50°58'28"N 3°18'50"W (50.974487, -3.313793)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 1 Feb 1967
  • Status: Active
  • Station Type: River level station
  • Station Reference: 52108
  • EA Gauge ID: 52108-level-stage-i-15_min-m
  • Parameter: Level
  • Unit: m
  • Typical rise rate: 1 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Catchment Area: Parrett, Brue and West Somerset Streams
  • Typical Range: 0.151 – 1.300 m
  • Drainage Area: 303 km² upstream of this gauge
  • Flow Data: Available (m³/s) via EA Hydrology
  • EA Cross-check: 0.13 m (EA at 23 Aug 23:15)
  • Flow Archive: National River Flow Archive ↗

Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

Catchment Character

🌊 Mixed response A balance of quick runoff and slower groundwater baseflow.

Your catchment is all the land that drains rainfall into the river above this gauge. Its character — how steep, wet, wooded, urban or chalky that land is — decides how fast rain here turns into a rising river. A steep, bare or clay catchment is “flashy” (rises and falls quickly, floods easily); a flat, chalk or well-wooded one is slow and steady. The tiles below put numbers to that; the flow-duration curve reads left-to-right from the river’s typical high flows (Q5) down to its low flows (Q95) — a steep curve means a flashy river.

The physical character of the land that drains to this gauge, and how it shapes its flood response — from the National River Flow Archive (UKCEH).

Baseflow Index
0.62
mixed response
Avg Annual Rainfall
866 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
0.9%
largely rural
Median Annual Flood
39.24 m³/s
QMED — typical yearly peak flow
Highest Recorded Flow
61.70 m³/s
11 Jul 1968
Flow-Duration Curve
mean 3.4012.001.830.3345% (high)% of days exceeded95% (low)
Daily flow (m³/s) exceeded each % of the time — a steep curve is flashy, a flat one is steady. Q5 high · Q50 median · Q95 low.
Land Cover (2023)
Woodland 7%Grassland 47%Arable 42%Urban 4%
Grassland 55% → 47% since 1990

Flow affected by: reservoir influence, groundwater abstraction.

Photos

Gauging-station photographs from the National River Flow Archive (UKCEH).

Photos © NRFA / UKCEH & the measuring authority — shown at web resolution. Full gallery on the NRFA ↗

About this gauge

Opened as one of the first compound Crump weirs in Britain in 1963. Situated 90m downstream of Great Somerford road bridge.

More detail

The catchment

Catchment mainly comprises Oolitic Limestone, with left bank tributaries draining off clays. Generally rapid to peak but slow recession. The upper catchment is dominated by the limestone of the Cotswold Hills. Land use is predominantly rural. No major catchment changes.

The station

Station located near the village of Great Somerford, 4km south east of Malmesbury and was opened in 1963 as one of the first Compound Crump weirs in Britain. Compound Crump profile weir having low flow crest between two flanking sections. Situated 90m downstream of Great Somerford road bridge.

How it measures flow

Full range station, all except extreme flows (e.g. 07/1968 drowned the structure) contained. Flows go out of bank upstream before bankfull at the structure. Full review carried out in 03/1998 to try to explain discrepancy between original rating & recent low flow gaugings. Still some uncertainty whether the adopted rating is the most appropriate. 5 year review carried out in 2010 but no changes were made. Further review carried out in 2015-16 and lowest section of the rating was updated to use a more recent coefficient of discharge. One peak flow rating across period of record. Modelling being done to asses bypassing and new routine for gauging now in place.

Flow regime

Flows augmented by groundwater scheme in catchment.

The flow record

Full period of record peak flow data reviewed and released in October 2018 (WINFAP Files v7) and in September 2023 (WINFAP Files v12).

Descriptions from the National River Flow Archive (UKCEH). NRFA station record ↗

Gauge Details

How this gauging station is built and how long it has measured (NRFA / UKCEH).

Gauge type
Gauging structure
Operating since
1964
Station datum
57.6 mAOD
Flow record
1963–2024 · 61 yrs · 100% complete
Peak-flow record
since 1963
Hydrometric area
53
Measured by
Environment Agency

Frequently asked questions

Is the River Tone at Greenham flooding today?

The current level is 0.13m, which is below the typical range. Flooding is very unlikely at this level.

Is the river level rising or falling at Greenham?

Based on the most recent readings, the level is currently steady. The chart above shows the last 7 days of measurements, updated roughly every 15 minutes.

What is a normal level for the River Tone at Greenham?

The typical range at this station is 0.15m to 1.30m, based on Environment Agency historical data. Levels above 1.30m are higher than usually seen and may indicate a flood risk.

How often is this river level data updated?

Readings are taken by the Environment Agency gauge roughly every 15 minutes and FloodRadar refreshes its data continuously, so the level shown is normally less than an hour old.

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📮 Flood risk by postcode near this gauge

Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:

Check any UK postcode’s flood risk →

🏠 Buying or renting around here? Get the Property Flood-Risk Report for any English postcode — official risk band, floods since 1946, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →