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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.
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
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.
1 storm overflow is traced upstream of this gauge, the nearest 1.9 km away along the river. 0 report discharging now, 1 reports not discharging.
Wessex Water · into Tributary Of Abberd Brook · 3.9 km away in a straight line · no mapped watercourse close enough to be sure
70 spills · 1,501 hours in 2025
Not discharging now · last
8 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are not listed.
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. Sewage & storm overflows →
In a typical year this gauge reaches its typical high of 0.48 m
on about 22 days.
This year so far: 25 days.
202625 days so far
202517 days, 4 of them high · 4 high
202463 days, 17 of them high · 17 high
202341 days, 7 of them high · 7 high
20228 days
202111 days, 1 of them high · 1 high
202024 days, 4 of them high · 4 high
201915 days, 1 of them high · 1 high
201815 days, 2 of them high · 2 high
20176 days
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 0.76 m, the level this gauge tops only a few days a year.
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Related gauges
Measured from a year of how these gauges actually moved.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Marden at Calne flooding today?
The current level is 0.18m, which is within the typical range of 0.04 to 0.48m. Flooding is unlikely at this level.
Is the river level rising or falling at Calne?
Based on the most recent readings, the level is currently falling slightly. 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 River Marden at Calne?
The typical range at this station is 0.04m to 0.48m, based on Environment Agency historical data. Levels above 0.48m 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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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:
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