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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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Current Level
-0.376 mAOD
▼ Falling (-14cm/hr)
24h Max
1.776 mAOD
24h Min
-0.376 mAOD
Typical Range
-0.70 - 3.30
mAOD
Highest Recorded
3.65 mAOD
EA official record
2.78 in our data (since Oct 2026)
🚽Sewage overflows nearby
Recent Water Levels
🌍 floodradar.co.uk
1 day
EA forecast (official)
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.
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
25 storm overflows are traced upstream of this gauge, the nearest 24.5 km away along the river. 0 report discharging now, 23 report not discharging, and for 2 the monitor is offline or has not reported, so their status is not known.
Southern Water · into Tidal River Arun · 5.9 km away in a straight line · discharges to the sea, an estuary or tidal water
32 spills · 202 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 →
The current level is -0.38m, which is within the typical range of -0.70 to 3.30m. Flooding is unlikely at this level.
Is the river level rising or falling at Arundel?
Based on the most recent readings, the level is currently falling. The chart above shows the last 12 hours of measurements by default (up to 7 days), updated roughly every 15 minutes.
Why is the level slowly falling?
When little or no rain has fallen for a while, a river level gradually drops as the water stored in the ground and soil drains away with nothing to replace it. This is called baseflow recession and is normal in dry spells. Only about 0.0mm of rain has fallen nearby in the last 7 days, so the flow is being sustained mainly by groundwater. A gentle decline like this is expected and is not a sign of a problem — downstream gauges often recede a little faster than headwaters further upstream, and levels recover once rain returns.
What is a normal level for the River Arun at Arundel?
The typical range at this station is -0.70m to 3.30m, based on Environment Agency historical data. Levels above 3.30m 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.
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