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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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Current Level
0.072 mASD
▬ Steady
24h Max
0.072 mASD
24h Min
0.056 mASD
Typical Range
0.05 - 0.30
mASD
Highest Recorded
1.29 mASD
EA official record
1.00 in our data (since Oct 1984)
Current level is 6% 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.
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 0.30 m
on about 73 days.
This year so far: 74 days.
202674 days so far
202537 days
2024202 days, 29 of them high · 29 high
2023107 days, 26 of them high · 26 high
202229 days
2021102 days, 11 of them high · 11 high
202097 days, 8 of them high · 8 high
201925 days, 2 of them high · 2 high
201852 days, 4 of them high · 4 high
20179 days
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 0.74 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2019 for the 2 flood
areas linked to this gauge (nearest 5.9 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 Knettishall flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 2 areas linked to this gauge, nearest first.
🌊 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
0.60
mixed response
Avg Annual Rainfall
617 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
1.0%
largely rural
Highest Daily Mean Flow
6.51 m³/s
27 Aug 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.
Gauging a Chalk catchment with large Boulder Clay cover and predominantly arable land, flow record significantly affected by drowning and artificial influences.
More detail
The catchment
Chalk catchment with large Boulder Clay cover. Predominantly arable.
The station
Crump profile weir, 4.5m broad. Structure drowns above 3.35 cumecs. 3 wells constructed in 1987 to augment low flows. In 1979 replaced a broad crested weir called Knettishall Heath Weir located just u/s from current station. Removed from peak flows dataset in September 2020 (WINFAP Files v9).
How it measures flow
Weir drowned regularly, particular in summer. Significant scatter in gaugings above 0.2m - removed from peak flow dataset for this reason. Rating is for the structure built in 1979 and has been applied to whole record.
Flow regime
Minor industrial/agricultural abstractions and returns. 3 wells constructed in 1987 to augment low flows. Flow in summer 2022 potentially affected by groundwater pumping scheme.
The flow record
The 1960 flood level of 17.9mAOD (1.5m stage) was recorded on the Knettishall Heath Weir drawing.
Timing, not cause. Gauges can move together simply because the same rain fell on both.
Frequently asked questions
Is the River Little Ouse at Knettishall flooding today?
The current level is 0.07m, which is within the typical range of 0.05 to 0.30m. Flooding is unlikely at this level.
Is the river level rising or falling at Knettishall?
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 Little Ouse at Knettishall?
The typical range at this station is 0.05m to 0.30m, based on Environment Agency historical data. Levels above 0.30m 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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