Hull and East Riding catchment
• Wholsea Grange • East Riding of Yorkshire • ID: F3402 • Level
(32m ago) • 3 readings/hr • 153 views
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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
0.083 m
▬ Steady
24h Max
0.089 m
24h Min
0.083 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 7% 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
In a typical year this gauge reaches its typical high of 0.32 m
on about 46 days.
This year so far: 39 days.
202639 days, 1 of them high · 1 highso far
202535 days, 9 of them high · 9 high
202496 days, 12 of them high · 12 high
202372 days, 14 of them high · 14 high
20229 days, 1 of them high · 1 high
202155 days, 9 of them high · 9 high
202040 days, 4 of them high · 4 high
201954 days, 11 of them high · 11 high
201835 days, 4 of them high · 4 high
201715 days
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 0.52 m, the level this gauge tops only a few days a year.
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.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 7 areas linked to this gauge, nearest first.
🌊 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 Daily Mean Flow
8.10 m³/s
26 Jun 2007 · 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.
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
Frequently asked questions
Is the Back Delfin at Wholsea Grange flooding today?
The current level is 0.08m, 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 12 hours of measurements by default (up to 7 days), 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 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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