Hampshire Avon catchment
• Burton • Bournemouth, Christchurch and Poole • ID: 43118 • Level
(30m ago) • 4 readings/hr • 159 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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Not an emergency service — if in danger call 999. Alerts rely on
EA/SEPA/NRW data and are best-efforts. Terms
Current Level
0.361 mASD
▬ Steady
24h Max
0.365 mASD
24h Min
0.339 mASD
Typical Range
0.33 - 0.64
mASD
Highest Recorded
0.84 mASD
EA official record
A 1.18 reading (11 Mar 2014) sits in our unverified raw history and is not treated as the record
Current level is 43% 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 7 Oct (2 days behind — the EA publishes each day's mean a day or two after it ends; unchecked, provisional)via EA Hydrology
Storm overflows whose water reaches this gauge on the mapped river network, nearest first by distance along the river. The status is each water company's monitor: it says whether an overflow is discharging, not how much or what it contains.
33 storm overflows are traced upstream of this gauge, the nearest 16.6 km away along the river. 0 report discharging now, 29 report not discharging, and for 4 the monitor is offline or has not reported, so their status is not known.
Wessex Water · into Trib Of River Stour(S) · 2.5 km away in a straight line · not connected to this gauge on the river map
1 spill · 1 hours in 2025
Not discharging now · last
6 more within 6 km whose connection is not known.
2 other overflows within 6 km are downstream of this gauge or on another branch of the river network, so they are not listed.
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 0.64 m
on about 18 days.
This year so far: 31 days.
202631 days, 16 of them high · 16 highso far
20257 days
202458 days, 6 of them high · 6 high
202332 days, 5 of them high · 5 high
20220 days
20211 day
202041 days, 2 of them high · 2 high
201913 days
20186 days
20170 days
Counted from each day's highest reading. Days with missing or implausible readings are left out.
The darker part is days above 0.77 m, the level this gauge tops only a few days a year.
Flood history near this gauge
Official Environment Agency warnings issued since 2007 for the 17 flood
areas linked to this gauge (nearest 1.0 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 Burton flood history.
Flood areas linked to this gauge
Flood warnings and alerts are issued for whole areas. These are the 17 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
0.86
groundwater-fed — slow & steady
Avg Annual Rainfall
895 mm/yr
1991–2020 · +6% since 1941–70
Urban Extent
1.7%
largely rural
Highest Daily Mean Flow
146 m³/s
14 Feb 1990 · 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.
Ultrasonic station with rectangular cross-section on main River Avon channel.
More detail
The catchment
Mixed geology; predominantly Chalk with sands, gravels and clays in the lower catchment. Land use is rural.
The station
Station closed on 5th May 2024 due to high uncertainty in bypass flow.
How it measures flow
Ultrasonic station - dual cross path. Both banks are piled and the bed is dredged to form a rectangular cross-section. Limited number of flow readings logged per day up to Aug 1988. Record improved from 1991 and subsequently very good when in bank. Monthly check gaugings confirm improved performance. Bypassing commences, in normal conditions, at about 41 cumecs. Above this an equation has been derived, by carrying out extensive flow measurements of the by-passing flow. On occasions, typically in an unusually wet spring/summer and when aquatic weed growth in the channel is prolific, the bypassing can occur below 41 cumecs. Attempts to correct the recorded flow are carried out by measuring the bypassing. Some additional uncertainty is inevitable under these conditions.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Ultrasonic
Operating since
1974–2024
Station datum
2.5 mAOD
Flow record
1975–2023 · 48 yrs · 100% complete
Hydrometric area
43
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
Frequently asked questions
Is the River Avon at Knapp Mill flooding today?
The current level is 0.36m, which is within the typical range of 0.33 to 0.64m. Flooding is unlikely at this level.
Is the river level rising or falling at Knapp Mill?
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 Avon at Knapp Mill?
The typical range at this station is 0.33m to 0.64m, based on Environment Agency historical data. Levels above 0.64m 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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