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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.
Beta. You'll be notified when a flood wave detected at an upstream gauge is forecast to reach this station, with an estimated arrival time. Accuracy improves as we verify more waves.
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
0.021 mASD
▬ Steady
24h Max
0.023 mASD
24h Min
0.020 mASD
Typical Range
0.10 - 1.30
mASD
Highest Recorded
3.38 mASD
EA official record
A 3.91 reading (16 Mar 2013) sits in our unverified raw history and is not treated as the record
Current level is 1% 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
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.
9 storm overflows are traced upstream of this gauge, the nearest 5.3 km away along the river. 0 report discharging now, 9 report not discharging.
Anglian Water · into Tributary Of Diddington Brook · 6.0 km away in a straight line · its watercourse is not on the river map
66 spills · 731 hours in 2025
Not discharging now · last
1 other overflow within 6 km is downstream of this gauge or on another branch of the river network, so it is 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 →
In a typical year this gauge reaches its typical high of 1.30 m
on about 4 days.
This year so far: 9 days.
20269 days, 8 of them high · 8 highso far
20253 days
202416 days, 14 of them high · 14 high
20234 days
20221 day, 1 of them high · 1 high
20215 days, 4 of them high · 4 high
20204 days, 4 of them high · 4 high
20193 days, 1 of them high · 1 high
20182 days, 2 of them high · 2 high
20172 days, 2 of them high · 2 high
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 1.49 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2013 for the 5 flood
areas linked to this gauge (nearest 3.0 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 Hail Weston flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 5 areas linked to this gauge, nearest first.
🌊 FlashyRain runs off fast — levels rise and fall sharply, often within hours of heavy rain.
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
0.31
flashy — rain runs off fast
Avg Annual Rainfall
620 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
0.7%
largely rural
Median Annual Flood
16.82 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
21.90 m³/s
15 Mar 1964 · 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.
Compound weir gauging a predominantly clay catchment with near-natural flow regime.
More detail
The catchment
Predominantly clay catchment - very flashy by Anglian standards. Agricultural, predominantly arable.
The station
Compound weir with triangular profile centre section 3m wide and broad-crested flanks in a trapezoidal channel, 8.5m wide. One of 3 stations used to calculate Offord flow to determine abstraction regime at Grafham Water. No major bridge/weir change from 1959 drawings to H Reed 1994 survey.
How it measures flow
Downstream level used to flag non-modularity. Peak flow rating takes non-modularity into account but there is a high degree of scatter. One peak flow ratings applied across period of record. There is a stage offset of +1m in WISKI. This has been applied to all stage data, ratings, gaugings, bankfull and wingwall height.
Flow regime
Predominantly natural regime with modest abstractions for agriculture. Some effluent returns.
The flow record
Peak flows rejected between 1963 and 1966 due to low confidence. Water year 2002/2003 rejected due to AMAX occurring during missing period in Jan-Mar 2003. Full period of record peak flow data reviewed and released in August 2021 (WINFAP Files v10).
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Kym at Hail Weston flooding today?
The current level is 0.02m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Hail Weston?
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 Kym at Hail Weston?
The typical range at this station is 0.10m to 1.30m, based on Environment Agency historical data. Levels above 1.30m 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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📮 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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21 Sep 2018 Upstream section
21 Sep 2018 Downstream section
1983 View of structure
1983 Upstream section
1983 Downstream section
1983 View across weir from right bank to left bank