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-0.28

Oaksey

Swill Brook ⚙ Structure
Cotswolds catchment • Oaksey • Wiltshire • ID: 0155TH • Level
(29m ago) • 2 readings/hr • 172 views

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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

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.

Recent Readings

Steady over 10h
08 Oct 20:00 ▬ steady -0.276 mASD
08 Oct 19:30 ▬ steady -0.276 mASD
08 Oct 19:00 ▬ steady -0.276 mASD
08 Oct 18:30 ▬ steady -0.276 mASD
08 Oct 18:00 ▬ steady -0.276 mASD
08 Oct 17:30 ▬ steady -0.276 mASD
08 Oct 17:00 ▬ steady -0.276 mASD
08 Oct 16:30 ▬ steady -0.276 mASD
08 Oct 16:00 ▬ steady -0.276 mASD
08 Oct 15:30 ▬ steady -0.276 mASD
08 Oct 15:00 ▬ steady -0.276 mASD
08 Oct 14:30 ▬ steady -0.276 mASD
08 Oct 14:00 ▬ steady -0.276 mASD
08 Oct 13:30 ▬ steady -0.276 mASD
08 Oct 13:00 ▬ steady -0.276 mASD
08 Oct 12:30 ▬ steady -0.276 mASD
08 Oct 12:00 ▬ steady -0.276 mASD
08 Oct 11:30 ▬ steady -0.276 mASD
08 Oct 11:00 ▬ steady -0.276 mASD
08 Oct 10:30 -0.276 mASD

Station Details

  • Monitoring Station: Oaksey
  • Watercourse: Swill Brook
  • Nearest Town: Oaksey
  • County: Wiltshire
  • Coordinates: 51°37'56"N 2°0'26"W (51.632205, -2.007169)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Date Opened: 1 Jan 1983
  • Status: Active
  • Station Type: River level station (multi-sensor)
Technical details: references, datum, range, flow archive
  • Station Reference: 0155TH
  • RLOI id: 7012 (the EA's check-for-flooding station id)
  • EA Gauge ID: 0155TH-level-stage-i-15_min-mASD
  • Parameter: Level
  • Unit: mASD
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: ⚙ Yes — lock, weir, sluice or pump
  • Catchment Area: Cotswolds
  • Typical Range: 0.000 – 1.311 mASD
  • Drainage Area: 53 km² upstream of this gauge
  • EA Cross-check: -0.28 mASD (EA at 8 Oct 19:30)
  • 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.

Nearby Stations

Gauges connected to this river, and others nearby. A distance “by river” follows the river on the map; any other is in a straight line.

Connected downstream

Same river system, separate branch

Distances by river: OS Open Rivers. Contains OS data © Crown copyright and database rights 2026.

💧 Storm overflows upstream of this gauge

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.

💧
Wessex Water · into Braydon Brook (S) · 1.6 km away in a straight line · no mapped watercourse close enough to be sure
29 spills · 393 hours in 2025
Not discharging now · last
💧
Wessex Water · into Unnamed Ditch Trib Of Braydon · 3.1 km away in a straight line · its watercourse is not on the river map
34 spills · 549 hours in 2025
Not discharging now · last
💧
Wessex Water · into Unnamed Trib Of Derry Brook · 4.2 km away in a straight line · no mapped watercourse close enough to be sure
22 spills · 171 hours in 2025
Not discharging now · last
💧
Wessex Water · into Trib River Avon (S) · 5.4 km away in a straight line · not connected to this gauge on the river map
19 spills · 250 hours in 2025
Not discharging now · last
💧
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 →

Contains OS data © Crown copyright and database rights 2026.

Rainfall & Weather

Loading rainfall and weather data...

How often this river runs high

In a typical year this gauge reaches its typical high of 1.31 m on about 39 days. This year so far: 46 days.

2026 46 days so far
2025 36 days, 2 of them high · 2 high
2024 69 days, 13 of them high · 13 high
2023 88 days, 16 of them high · 16 high
2022 18 days
2021 11 days
2020 29 days, 6 of them high · 6 high
2019 57 days, 1 of them high · 1 high
2018 26 days, 1 of them high · 1 high
2017 13 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).

33flood warnings 122flood alerts

Most recent flood warning: 18 Dec 2025 — Tetbury Avon at Malmesbury

Year by year
YearWarningsAlerts
2026 0 27
2025 4 12
2024 11 17
2023 7 17
2022 0 1
2021 0 5
2020 6 5
2019 0 6
2018 0 4
2017 0 1
2016 0 5
2015 0 2
2014 0 5
2013 0 3
2012 5 8
2011 0 3
2010 0 1

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.

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
0.58
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
mean 0.3081.520.0675% (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 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.

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
1982–2016
Station datum
87.5 mAOD
Flow record
1984–2015 · 31 yrs · 53% complete
Hydrometric area
39
Measured by
Environment Agency

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.

Preview

📮 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, recorded floods, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →