Fal and St Austell Streams catchment
• Bissoe • Cornwall • ID: 48137 • Level
(34m ago) • 3 readings/hr • 148 views
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Current Level
0.255 m
▬ Steady
24h Max
0.256 m
24h Min
0.251 m
Typical Range
0.24 - 0.86
m
Highest Recorded
1.76 m
27 Jan 2026
Since Oct 1994
Current level is 14% 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.
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 23:15▬ steady0.255 m
23 Aug 23:00▬ steady0.255 m
23 Aug 22:30▲ +0.1 cm0.255 m
23 Aug 21:30▬ steady0.254 m
23 Aug 21:15▬ steady0.254 m
23 Aug 21:00▲ +0.1 cm0.254 m
23 Aug 20:45▬ steady0.253 m
23 Aug 20:30▬ steady0.253 m
23 Aug 20:15▬ steady0.253 m
23 Aug 20:00▬ steady0.253 m
23 Aug 19:45▬ steady0.253 m
23 Aug 19:30▬ steady0.253 m
23 Aug 19:15▬ steady0.253 m
23 Aug 19:00▬ steady0.253 m
23 Aug 18:45▼ -0.1 cm0.253 m
23 Aug 18:30▬ steady0.254 m
23 Aug 18:15▬ steady0.254 m
23 Aug 18:00▼ -0.1 cm0.254 m
23 Aug 17:45▬ steady0.255 m
23 Aug 17:300.255 m
Rainfall & Weather
Loading rainfall and weather data...
Flood history near this gauge
Official Environment Agency warnings issued since 2014 for the 7 flood
areas linked to this gauge (nearest 2.7 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 Bissoe 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
0.62
mixed response
Avg Annual Rainfall
1,250 mm/yr
1991–2020 · +7% since 1941–70
Urban Extent
2.6%
largely rural
Median Annual Flood
4.84 m³/s
QMED — typical yearly peak flow
Highest Recorded Flow
7.11 m³/s
1 Jan 2003
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.
Flat V weir opened in 1994 gauging a mainly rural catchment.
More detail
The catchment
The catchment consists mostly of Devonian slates and sandstones and Granite. Also with some areas of alluvium, Greenstones and Quartz Porphyry. Land use mostly rural with some urbanisation. No major changes in catchment.
The station
Station opened in 1994. Flat V weir, crest length approximately 4.0m wide.
How it measures flow
Relatively straight approach. High sediment loads. Bankfull at 2.5m. Three peak flow ratings across period of record. Change in downstream maintenance regime has resulted in gradual infilling of channel and drowning of the weir from an increasingly lower level (0.33m). Early drowning and In addition impacts from backing up from Bissoe bridge has resulted in a rating change from October 2011 based on extensive gauging. Acoustic Time of Flight was installed in 2013 due to the unstable stage discharge relationship. Therefore good confidence in data from 2011 onwards.
Flow regime
No major influences to flow regime.
The flow record
Data removed from 2020 temporarily due to reliability issues.
How this gauging station is built and how long it has measured (NRFA / UKCEH).
Gauge type
Flat-V weir
Operating since
1994
Flow record
1994–2020 · 26 yrs · 100% complete
Peak-flow record
since 1994
Hydrometric area
48
Measured by
Environment Agency
Nearby Groundwater
Soil Moisture
Possible storm-overflow correlation
🚽 Storm overflows on this river
Frequently asked questions
Is the Carnon River at Bissoe flooding today?
The current level is 0.26m, which is within the typical range of 0.24 to 0.86m. Flooding is unlikely at this level.
Is the river level rising or falling at Bissoe?
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 Carnon River at Bissoe?
The typical range at this station is 0.24m to 0.86m, based on Environment Agency historical data. Levels above 0.86m 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:
