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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 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.
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Current Level
0.061 mASD
▬ Steady
24h Max
0.063 mASD
24h Min
0.061 mASD
Typical Range
0.02 - 0.50
mASD
Highest Recorded
0.28 mASD
12 Feb 2001
Since Jan 1982
Current level is 22% 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
23 Aug 23:30▬ steady0.061 mASD
23 Aug 23:15▬ steady0.061 mASD
23 Aug 23:00▬ steady0.061 mASD
23 Aug 22:45▬ steady0.061 mASD
23 Aug 21:30▬ steady0.061 mASD
23 Aug 21:15▬ steady0.061 mASD
23 Aug 21:00▬ steady0.061 mASD
23 Aug 20:45▬ steady0.061 mASD
23 Aug 20:30▬ steady0.061 mASD
23 Aug 20:15▬ steady0.061 mASD
23 Aug 20:00▬ steady0.061 mASD
23 Aug 19:45▬ steady0.061 mASD
23 Aug 19:30▬ steady0.061 mASD
23 Aug 19:15▬ steady0.061 mASD
23 Aug 19:00▬ steady0.061 mASD
23 Aug 18:45▬ steady0.061 mASD
23 Aug 18:30▬ steady0.061 mASD
23 Aug 18:15▬ steady0.061 mASD
23 Aug 18:00▬ steady0.061 mASD
23 Aug 17:450.061 mASD
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2009 for the 8 flood
areas linked to this gauge (nearest 2.4 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 Whitwell 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
0.86
groundwater-fed — slow & steady
Avg Annual Rainfall
665 mm/yr
1991–2020 · +3% since 1941–70
Urban Extent
0.8%
largely rural
Highest Recorded Flow
0.467 m³/s
13 Oct 1993
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.
Land Cover (2023)
Woodland 9%Grassland 23%Arable 65%Urban 2%
Arable 72% → 65% since 1990
Flow affected by: groundwater abstraction.
Photos
Gauging-station photographs from the National River Flow Archive (UKCEH).
The station is located in the upper Mimram catchment.
More detail
The catchment
A predominantly pervious (Chalk), rural catchment. Hydrological catchment divide is uncertain.
The station
Crump weir, 1.0m crest (rather insensitive) within wider section.
How it measures flow
All flows are contained and are modular.
Flow regime
Generally stable flow regime, sustained from Chalk springs. Low flows are occasionally augmented by pumping from local tube wells but overall runoff is significantly reduced by gw abstraction. U/s cress-beds can influence low flow pattern.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Crump weir
Operating since
1970
Station datum
88.1 mAOD
Flow record
1970–2024 · 54 yrs · 100% complete
Hydrometric area
38
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the River Mimram at Whitwell flooding today?
The current level is 0.06m, which is within the typical range of 0.02 to 0.50m. Flooding is unlikely at this level.
Is the river level rising or falling at Whitwell?
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 Mimram at Whitwell?
The typical range at this station is 0.02m to 0.50m, based on Environment Agency historical data. Levels above 0.50m 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.
Embed this gauge on your website
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: