Cam and Ely Ouse (Including South Level) catchment
• Knettishall • Norfolk • ID: E22163 • Level
(23m ago) • 4 readings/hr • 149 views
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Current Level
0.062 m
▬ Steady
24h Max
0.070 m
24h Min
0.062 m
Typical Range
0.05 - 0.30
m
Highest Recorded
1.29 m
EA official record
1.00 in our data (since Oct 1984)
Current level is 5% 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▬ steady0.062 m
24 Aug 00:15▬ steady0.062 m
24 Aug 00:00▬ steady0.062 m
23 Aug 23:45▬ steady0.062 m
23 Aug 23:30▬ steady0.062 m
23 Aug 23:15▬ steady0.062 m
23 Aug 23:00▼ -0.1 cm0.062 m
23 Aug 22:45▬ steady0.063 m
23 Aug 21:30▬ steady0.063 m
23 Aug 21:15▬ steady0.063 m
23 Aug 21:00▬ steady0.063 m
23 Aug 20:45▬ steady0.063 m
23 Aug 20:30▬ steady0.063 m
23 Aug 20:15▬ steady0.063 m
23 Aug 20:00▬ steady0.063 m
23 Aug 19:45▬ steady0.063 m
23 Aug 19:30▬ steady0.063 m
23 Aug 19:15▬ steady0.063 m
23 Aug 19:00▬ steady0.063 m
23 Aug 18:450.063 m
Rainfall & Weather
Loading rainfall and weather data...
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.
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
0.60
mixed response
Avg Annual Rainfall
617 mm/yr
1991–2020 · +2% since 1941–70
Urban Extent
1.0%
largely rural
Highest Recorded Flow
6.51 m³/s
27 Aug 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.
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.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1980
Station datum
16.0 mAOD
Flow record
1980–2024 · 44 yrs · 100% complete
Hydrometric area
33
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the River Little Ouse at Knettishall flooding today?
The current level is 0.06m, 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 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 9.0mm 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 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 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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📮 Flood risk by postcode near this gauge
Postcodes within 5 km with properties in the Environment Agency’s rivers-and-sea flood-risk bands:
