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⤴Unusual rise — FloodRadar+Top 1% rise rate for this gauge.
Height for "Above a height"
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 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.
Get notified when recent rainfall near this gauge crosses its learnt rise trigger — an early "watch"
signal, typically hours before a rise. Experimental; not an official flood warning.
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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
0.122 mASD
▬ Steady
24h Max
0.123 mASD
24h Min
0.114 mASD
Typical Range
0.09 - 0.53
mASD
Highest Recorded
1.16 mASD
EA official record
A 1.79 reading (24 Dec 2013) sits in our unverified raw history and is not treated as the record
Current level is 11% of this
🚽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.
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.
Flow Data: Daily mean flow (m³/s) to 6 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
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.
Thames Water · into Cranleigh Waters · 4.5 km away in a straight line · no mapped watercourse close enough to be sure
0 spills · 0 hours in 2025
Not discharging now
3 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. Explore the sewage map →
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.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 6 areas linked to this gauge, nearest first.
🌊 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 Daily Mean Flow
4.16 m³/s
10 Oct 1987 · daily mean, not the instantaneous peak
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.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Tillingbourne at Shalford flooding today?
The current level is 0.12m, 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 12 hours of measurements by default (up to 7 days), 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 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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📮 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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