Hull and East Riding catchment
• Wholsea Grange • East Riding of Yorkshire • ID: F3402 • Level
(23m ago) • 4 readings/hr • 135 views
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Current Level
0.089 m
▬ Steady
24h Max
0.094 m
24h Min
0.089 m
Typical Range
0.09 - 0.32
m
Highest Recorded
1.11 m
EA official record
0.98 in our data (since Jan 1989)
Current level is 8% 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▬ steady0.089 m
23 Aug 23:15▬ steady0.089 m
23 Aug 23:00▬ steady0.089 m
23 Aug 22:45▬ steady0.089 m
23 Aug 21:30▬ steady0.089 m
23 Aug 21:15▬ steady0.089 m
23 Aug 21:00▬ steady0.089 m
23 Aug 20:45▬ steady0.089 m
23 Aug 20:30▬ steady0.089 m
23 Aug 20:15▬ steady0.089 m
23 Aug 20:00▬ steady0.089 m
23 Aug 19:45▬ steady0.089 m
23 Aug 19:30▬ steady0.089 m
23 Aug 19:15▬ steady0.089 m
23 Aug 19:00▬ steady0.089 m
23 Aug 18:45▬ steady0.089 m
23 Aug 18:30▬ steady0.089 m
23 Aug 18:15▬ steady0.089 m
23 Aug 18:00▬ steady0.089 m
23 Aug 17:450.089 m
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2010 for the 7 flood
areas linked to this gauge (nearest 1.9 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 Wholsea Grange 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
0.74
groundwater-fed — slow & steady
Avg Annual Rainfall
708 mm/yr
1991–2020 · +4% since 1941–70
Urban Extent
1.3%
largely rural
Highest Recorded Flow
8.10 m³/s
26 Jun 2007
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 4%Grassland 15%Arable 76%Urban 5%
Arable 82% → 76% since 1990
About this gauge
Flat V weir draining mainly rural catchment, headwaters in Yorkshire Wolds but much of catchment on very low lying, flat land.
More detail
The catchment
Largely rural catchment with arable and some livestock farming. Geology is a mixture of permeable chalk in the upper catchment with lower permeability mudstone in the lower catchment. Much of the lower catchment is overlain by mixed permeability superficial deposits.
The station
Flat V weir 4m wide with 1:10 cross-slopes and vertical concrete wingwalls on Back Delfin / Market Weighton Canal system. Instrrument kiosk with stilling well on right bank. Mainly rural catchment, rising on southern escarpment of Yorkshire Wolds but quickly dropping onto flat plains close to the Humber.
Flow regime
Relatively responsive regime but with strong underlying baseflow signal. Artificial influences from agricultural abstraction and some sewage treatment works discharges. Lower catchment is affected by artificial drainage modifying the natural flow paths. Former Market Weighton canal, now disused and partially filled in, splits part of the lower catchment and forces some of the natural drainage network to discharge downstream of the gauge, reducing the catchment area compared to the natural topography.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Flat-V weir
Operating since
1989
Station datum
5.5 mAOD
Flow record
1989–2024 · 35 yrs · 100% complete
Hydrometric area
26
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the Back Delfin at Wholsea Grange flooding today?
The current level is 0.09m, which is below the typical range. Flooding is very unlikely at this level.
Is the river level rising or falling at Wholsea Grange?
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 Back Delfin at Wholsea Grange?
The typical range at this station is 0.09m to 0.32m, based on Environment Agency historical data. Levels above 0.32m 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:
