Vale of White Horse catchment
• Bagnor • West Berkshire • ID: 2264TH • Level
(23m ago) • 4 readings/hr • 152 views
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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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Current Level
0.053 mASD
▬ Steady
24h Max
0.053 mASD
24h Min
0.050 mASD
Typical Range
0.04 - 0.20
mASD
Highest Recorded
0.55 mASD
20 Jul 2007
Since Nov 1986
Current level is 10% of this
🚽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. Shown with its calibrated 10–90% confidence band. 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
Rising · +0.2 cm over 6h
24 Aug 00:30▲ +0.1 cm0.053 mASD
24 Aug 00:15▬ steady0.052 mASD
24 Aug 00:00▬ steady0.052 mASD
23 Aug 23:45▬ steady0.052 mASD
23 Aug 23:30▬ steady0.052 mASD
23 Aug 23:15▲ +0.1 cm0.052 mASD
23 Aug 23:00▬ steady0.051 mASD
23 Aug 22:45▬ steady0.051 mASD
23 Aug 21:30▬ steady0.051 mASD
23 Aug 21:15▬ steady0.050 mASD
23 Aug 21:00▬ steady0.051 mASD
23 Aug 20:45▬ steady0.050 mASD
23 Aug 20:30▬ steady0.051 mASD
23 Aug 20:15▬ steady0.050 mASD
23 Aug 20:00▬ steady0.051 mASD
23 Aug 19:45▬ steady0.051 mASD
23 Aug 19:30▬ steady0.050 mASD
23 Aug 19:15▬ steady0.051 mASD
23 Aug 19:00▬ steady0.051 mASD
23 Aug 18:450.051 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2012 for the 6 flood
areas linked to this gauge (nearest 0.6 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 Bagnor flood history.
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
🌊 Groundwater-fedSlow and steady — fed largely by groundwater, so levels change gradually, not in sudden spikes.
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
0.77
groundwater-fed — slow & steady
Avg Annual Rainfall
770 mm/yr
1991–2020 · +8% since 1941–70
Urban Extent
0.1%
largely rural
Median Annual Flood
0.401 m³/s
QMED — typical yearly peak flow
Highest Recorded Flow
1.42 m³/s
20 Jul 2007
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.
The station is located in the lower reaches of the Winterbourne Stream, close to the confluence of the River Lambourn.
More detail
The catchment
A Chalk catchment (with extensive Clay-with-Flints cover). It is very rural in character.
The station
Crump weir, 3m wide, but was originally 5.5m wide and was reduced to improve sensitivity in 1968. Prone to siltation upstream of weir.
How it measures flow
Full range. Resurveyed in 1997 and a new datum was recorded. Non-modular flow conditions can occur when stage is in excess of 0.25m. Protected flows derived from standard Crump weir calculation.
Flow regime
Stable, spring-fed regime. Runoff reduced by gw abstractions (e.g. WBGS) during the POR.
The flow record
2017/2018 AMAX accounts for West Berks Groundwater Scheme pump test in May 2018. 2018/2019 AMAX not affected by WBGS. Full period of record peak flow data reviewed and released in September 2020 (WINFAP Files v9).
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1962
Station datum
80.5 mAOD
Flow record
1962–2024 · 62 yrs · 100% complete
Peak-flow record
since 1962
Hydrometric area
39
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the Winterbourne Stream at Bagnor flooding today?
The current level is 0.05m, which is within the typical range of 0.04 to 0.20m. Flooding is unlikely at this level.
Is the river level rising or falling at Bagnor?
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 Winterbourne Stream at Bagnor?
The typical range at this station is 0.04m to 0.20m, based on Environment Agency historical data. Levels above 0.20m 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:
