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Drag the line on the chart, or type a value:mASD
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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.
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.
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Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Current Level
-0.276 mASD
▬ Steady
24h Max
-0.272 mASD
24h Min
-0.276 mASD
Typical Range
0.00 - 1.31
mASD
Highest Recorded
1.89 mASD
EA official record
A 3.91 reading (16 Mar 2013) sits in our unverified raw history and is not treated as the record
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
Flood predictions aren't generated for
lock / structure gauges —
their levels are driven by gate operation,
not by catchment rainfall, so the forecast models would have no skill here.
None of the storm overflows FloodRadar holds is traced upstream of this gauge on the mapped river network. That is not the same as none: the map leaves out many small streams and culverts, so an overflow it cannot place may still drain here, and not every company publishes every overflow. Those nearby are listed below.
Nearby, connection not known
Within 6 km in a straight line, but the river map cannot say whether their water passes this gauge.
Thames Water · into Shorncote Ditch · 5.8 km away in a straight line · no mapped watercourse close enough to be sure
125 spills · 2,067 hours in 2025
Not discharging now · last
These are the water companies' monitor statuses; a spill does not by itself explain a change in the gauge level. River connections and distances are traced on OS Open Rivers (edition 2026-04), which leaves out many small channels. Explore the sewage map →
In a typical year this gauge reaches its typical high of 1.31 m
on about 39 days.
This year so far: 46 days.
202646 days so far
202536 days, 2 of them high · 2 high
202469 days, 13 of them high · 13 high
202388 days, 16 of them high · 16 high
202218 days
202111 days
202029 days, 6 of them high · 6 high
201957 days, 1 of them high · 1 high
201826 days, 1 of them high · 1 high
201713 days, 1 of them high · 1 high
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 1.61 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2010 for the 8 flood
areas linked to this gauge (nearest 3.3 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 Oaksey flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 8 areas linked to this gauge, nearest first.
🌊 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
0.58
mixed response
Avg Annual Rainfall
818 mm/yr
1991–2020 · +1% since 1941–70
Urban Extent
0.4%
largely rural
Highest Daily Mean Flow
8.67 m³/s
3 Dec 2005 · 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 5%Grassland 48%Arable 43%Urban 4%
About this gauge
The gauging station is located on Swill Brook, in the headwaters of the River Thames.
More detail
The catchment
Relatively flat, rural catchment given over to agriculture. Primarily impervious (Oxford Clay).
The station
Flat V weir installed in 2002 (with US installed more recently to improve measurement when FV drowned). Superseded unreliable EM. Not a primary gauging station.
How it measures flow
Some bypassing at high flows over 2.2 cumecs.
Flow regime
Essentially natural, responsive, flow regime but runoff may be influenced by gw pumping from the confined Oolite aquifer.
The flow record
Early flow record is patchy. Large range of velocities. Zero flow during most summers and monitoring of the lowest flow rates is suspect.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Gauging structure
Operating since
1982–2016
Station datum
87.5 mAOD
Flow record
1984–2015 · 31 yrs · 53% complete
Hydrometric area
39
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Frequently asked questions
Is the Swill Brook at Oaksey flooding today?
The current level is -0.28m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Oaksey?
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 Swill Brook at Oaksey?
The typical range at this station is 0.00m to 1.31m, based on Environment Agency historical data. Levels above 1.31m are higher than usually seen and may indicate a flood risk.
How often is this river level data updated?
Readings are supplied by the Environment Agency gauge. FloodRadar checks for updates roughly every 15 minutes; the timestamp above shows how recent the latest available reading is.
Embed this gauge on your website
Free live river-level widget — ideal for parish councils, angling clubs and local sites. Updates automatically.
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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: