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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 mASD/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
1.044 mASD
▬ Steady
24h Max
1.056 mASD
24h Min
1.044 mASD
Typical Range
1.01 - 2.61
mASD
Highest Recorded
7.42 mASD
28 Feb 2025
Since Nov 1986
Current level is 14% of this
Current Flow
Loading...
🚽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
Steady over 6h
23 Aug 23:15▬ steady1.044 mASD
23 Aug 23:00▬ steady1.044 mASD
23 Aug 22:45▬ steady1.044 mASD
23 Aug 21:30▬ steady1.045 mASD
23 Aug 21:15▬ steady1.044 mASD
23 Aug 21:00▬ steady1.044 mASD
23 Aug 20:45▬ steady1.045 mASD
23 Aug 20:30▬ steady1.045 mASD
23 Aug 20:15▬ steady1.045 mASD
23 Aug 20:00▬ steady1.045 mASD
23 Aug 19:45▬ steady1.045 mASD
23 Aug 19:30▬ steady1.045 mASD
23 Aug 19:15▬ steady1.045 mASD
23 Aug 19:00▬ steady1.045 mASD
23 Aug 18:45▬ steady1.045 mASD
23 Aug 18:30▬ steady1.045 mASD
23 Aug 18:15▬ steady1.045 mASD
23 Aug 18:00▬ steady1.045 mASD
23 Aug 17:45▬ steady1.045 mASD
23 Aug 17:301.045 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 0.8 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 Leatherhead 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
🌊 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
0.51
mixed response
Avg Annual Rainfall
826 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
10%
partly urbanised
Highest Recorded Flow
90.00 m³/s
24 Dec 2013
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.
Ultrasonic station gauging a mixed land use catchment.
More detail
The catchment
A predominantly impervious (Weald Clay) catchment which drains through the Box Hill gap in the North Downs (Chalk and Upper Greensand). Diverse land use.
The station
Currently ultrasonic, replacing an electromagnetic gauge in 2009.
Flow regime
Some sewage effluent derives from outside the catchment; Gw abstraction from the Chalk headwaters also.
The flow record
Gap and some flow truncation in the time series between 1996 and 2009.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Electromagnetic
Operating since
1986
Station datum
27.8 mAOD
Flow record
1986–2024 · 38 yrs · 96% complete
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 River Mole at Leatherhead flooding today?
The current level is 1.04m, which is within the typical range of 1.01 to 2.61m. Flooding is unlikely at this level.
Is the river level rising or falling at Leatherhead?
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.
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 3.3mm 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 Mole at Leatherhead?
The typical range at this station is 1.01m to 2.61m, based on Environment Agency historical data. Levels above 2.61m 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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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:
