Parrett, Brue and West Somerset Streams catchment
• Williton • Somerset • ID: 51111 • Level
(42m ago) • 4 readings/hr • 151 views
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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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You'll be notified when this gauge is rising more than 0.10 m/hr — a sign of rapidly increasing water levels.
Beta. You'll be notified when a flood wave detected at an upstream gauge is forecast to reach this station, with an estimated arrival time. Accuracy improves as we verify more waves.
You'll be notified when a new storm-overflow (sewage) discharge starts within ~3 km of this gauge, based on the water companies' near-real-time feeds.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
signal, typically hours before a rise. Experimental; not an official flood warning.
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EA/SEPA data and are best-efforts. Terms
Current Level
-0.006 mASD
▬ Steady
24h Max
-0.001 mASD
24h Min
-0.007 mASD
Typical Range
0.02 - 0.50
mASD
Highest Recorded
1.62 mASD
EA official record
1.33 in our data (since Jan 1992)
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
Prediction V2
Prediction Eris
Nimbus beta
Experimental model fusing soil moisture, river flow, groundwater and catchment
character. The shaded band is its 10–90% range, widened so that about 80% of recent outcomes fall inside it.
Under evaluation — not yet promoted, so treat as a second opinion.
River Flow
90 days
Daily mean discharge (m³/s) with the daily min–max band, from the EA Hydrology API. Flow is the volume of water passing the gauge — often a more direct flood signal than level.
Long Term
🌍 floodradar.co.uk
—
Consecutive rainy days0 → 10+
Days Above Normal
This year vs 5-year monthly range
Recent Readings
Steady over 6h
10 Sep 05:15▼ -0.1 cm-0.006 mASD
10 Sep 05:00▬ steady-0.005 mASD
10 Sep 04:45▬ steady-0.005 mASD
10 Sep 04:30▲ +0.1 cm-0.005 mASD
10 Sep 04:15▬ steady-0.006 mASD
10 Sep 04:00▬ steady-0.006 mASD
10 Sep 03:45▬ steady-0.006 mASD
10 Sep 03:30▼ -0.1 cm-0.006 mASD
10 Sep 03:15▬ steady-0.005 mASD
10 Sep 03:00▲ +0.1 cm-0.005 mASD
10 Sep 02:45▼ -0.1 cm-0.006 mASD
10 Sep 02:30▬ steady-0.005 mASD
10 Sep 02:15▲ +0.1 cm-0.005 mASD
10 Sep 01:15▬ steady-0.006 mASD
10 Sep 01:00▬ steady-0.006 mASD
10 Sep 00:45▬ steady-0.006 mASD
10 Sep 00:30▬ steady-0.006 mASD
10 Sep 00:15▬ steady-0.006 mASD
10 Sep 00:00▬ steady-0.006 mASD
09 Sep 23:30-0.006 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2007 for the 14 flood
areas linked to this gauge (nearest 0.5 km away).
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 Williton flood history.
Flow Data: Daily mean flow (m³/s) to 8 Sep (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
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 responseA 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
0.54
mixed response
Avg Annual Rainfall
1,522 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
0.0%
largely rural
Median Annual Flood
10.60 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
10.40 m³/s
26 Jan 2013 · daily mean, not the instantaneous peak
Flow-Duration Curve
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 21%Grassland 63%Heath/scrub 15%
Heath/scrub 38% → 15% since 1990
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
Crump weir for low flows plus rated section at higher flows. Nutscale Reservoir in headwaters affects runoff.
More detail
The catchment
Geology of Mid Devonian Grits and Lower Devonian Old Red Sandstone. The topography in the upper reaches of the river is typically steep sided, wooded valleys, draining Exmoor. Land-use is rural. No major changes in catchment.
The station
Opened in 1973. Triangular profile Crump weir for low flows, crest 4.5m wide, plus rated section at higher flows. Station closed from September 1979 to April 1985, reopened with telemetry facilities.
How it measures flow
Most flows contained, but some underflow may occur. Rating review carried out by the EA in 2010. A combination of theoretical rating for the weir and best-fit curve for medium and high flows now used. Validity of the curve beyond 0.8m is doubtful. Badly eroded weir repaired with stainless steel cap in the summer of 2016. Also, the downstream baffle has been modified to allow fish passage. One peak flow rating across period of record.
Flow regime
A small reservoir (Nutscale Reservoir) in headwaters affects runoff, especially with compensation flows in Summer.
The flow record
Between April 1973 and 1992 only daily mean flow available on EA archive. Data marked as suspect 9/5/16 - 18/5/16 & 7/9/16 due to works on the weir. Full period of record peak flow data reviewed and released in October 2018 (WINFAP Files v7) and in August 2024 (WINFAP Files v13).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1973
Station datum
61.0 mAOD
Flow record
1973–2024 · 51 yrs · 89% complete
Peak-flow record
since 1973
Hydrometric area
51
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
💧 Storm overflows on this river
Frequently asked questions
Is the Monksilver Stream at Williton flooding today?
The current level is -0.01m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Williton?
Based on the most recent readings, the level is currently steady. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
What is a normal level for the Monksilver Stream at Williton?
The typical range at this station is 0.02m to 0.50m, based on Environment Agency historical data. Levels above 0.50m 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:
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21 Nov 2016 Web cam image 21st November 2016 stage 0.973 metres.
23 Dec 2013
Horner Water at West Luccombe (51002) Control
Upstream view to gauging station