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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
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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 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.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
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Current Level
0.107 mASD
▬ Steady
24h Max
0.109 mASD
24h Min
0.105 mASD
Typical Range
0.09 - 0.53
mASD
Highest Recorded
1.79 mASD
24 Dec 2013
Since Nov 2012
Current level is 6% of this
🚽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
24 Aug 00:30▬ steady0.107 mASD
24 Aug 00:15▬ steady0.107 mASD
24 Aug 00:00▬ steady0.107 mASD
23 Aug 23:45▬ steady0.107 mASD
23 Aug 23:30▲ +0.1 cm0.107 mASD
23 Aug 23:15▼ -0.1 cm0.106 mASD
23 Aug 23:00▬ steady0.107 mASD
23 Aug 22:45▬ steady0.107 mASD
23 Aug 21:30▲ +0.1 cm0.107 mASD
23 Aug 21:15▬ steady0.106 mASD
23 Aug 21:00▼ -0.2 cm0.106 mASD
23 Aug 20:45▲ +0.2 cm0.108 mASD
23 Aug 20:30▬ steady0.106 mASD
23 Aug 20:15▬ steady0.106 mASD
23 Aug 20:00▼ -0.1 cm0.106 mASD
23 Aug 19:45▬ steady0.107 mASD
23 Aug 19:30▲ +0.1 cm0.107 mASD
23 Aug 19:15▬ steady0.106 mASD
23 Aug 19:00▬ steady0.106 mASD
23 Aug 18:450.106 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2012 for the 5 flood
areas linked to this gauge (nearest 2.6 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 Shalford 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
🌊 Groundwater-fedSlow and steady — fed largely by groundwater, so levels change gradually, not in sudden spikes.
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
0.89
groundwater-fed — slow & steady
Avg Annual Rainfall
866 mm/yr
1991–2020 · +5% since 1941–70
Urban Extent
2.2%
largely rural
Median Annual Flood
2.00 m³/s
QMED — typical yearly peak flow
Highest Recorded Flow
4.16 m³/s
10 Oct 1987
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.
Station influenced by drainage from the North Downs, a d/s artificial pond and high flows from the River Wye.
More detail
The catchment
The main valley is broad, but the headwaters drain the North Downs scarp and hilly terrain to the south also. The geology is dominated by the Lower Greensand that is nominally pervious. The catchment is responsive to heavy rainfall due to a large clay component within the geology. A rural catchment predominantly agricultural but with substantial woodland and many scattered settlements.
The station
Crump weir, 5.5m broad immediately d/s of ornamental pond. A tail recorder was added in August 2013.
How it measures flow
High flows often overestimated (backing-up from Wey causes drowning, crest-tapping operational but often blocked - requires regular cleaning and pumping out). If the tapping is blocked, an approximate rating for drowned flow is used. This is inaccurate because the weir will drown at different head values depending on the water levels in the River Wey. Rated by a standard Crump weir calculation. Rating for modular flow is reasonably accurate, but there are some discrepancies in both the gaugings and the rating extension for non-modular flow. One peak flow rating across the period of record.
Flow regime
Sensibly natural runoff pattern (natural to within 10% at Q95), but substantial baseflow component to flow regime but also responsive to heavy rainfall. Runoff influenced by groundwater abstraction/recharge. Some artificial flow regulation and very minor effect of industrial/agricultural abstractions and discharges.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1968
Station datum
31.7 mAOD
Flow record
1968–2024 · 56 yrs · 100% complete
Peak-flow record
since 1968
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 Tillingbourne at Shalford flooding today?
The current level is 0.11m, which is within the typical range of 0.09 to 0.53m. Flooding is unlikely at this level.
Is the river level rising or falling at Shalford?
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.
What is a normal level for the River Tillingbourne at Shalford?
The typical range at this station is 0.09m to 0.53m, based on Environment Agency historical data. Levels above 0.53m 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:
