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ST ERTH

Unknown
• ID: E45728 (formerly SW53F051) • Flow
⚙ The Environment Agency registered this site as SW53F051 until 2 Aug 2026; its history is included on this page.
(24m ago) • 4 readings/hr • 143 views
Current Flow
0.184 m3/s
▬ Steady
24h Max
0.184 m3/s
24h Min
0.178 m3/s
Typical Range
-
Highest Recorded
9.48 m3/s
29 Jan 2026
Since Feb 2025
🚽 Sewage overflows nearby

Recent Flow Readings

🌍 floodradar.co.uk
1 day

Recent Readings

Steady over 6h
20 Sep 07:30 ▬ steady 0.184 m3/s
20 Sep 07:15 ▬ steady 0.184 m3/s
20 Sep 07:00 ▬ steady 0.184 m3/s
20 Sep 06:45 ▬ steady 0.184 m3/s
20 Sep 06:30 ▬ steady 0.184 m3/s
20 Sep 06:15 ▬ steady 0.184 m3/s
20 Sep 06:00 ▬ steady 0.184 m3/s
20 Sep 05:45 ▬ steady 0.184 m3/s
20 Sep 05:30 ▬ steady 0.184 m3/s
20 Sep 05:15 ▬ steady 0.184 m3/s
20 Sep 04:30 ▬ steady 0.184 m3/s
20 Sep 04:15 ▬ steady 0.184 m3/s
20 Sep 04:00 ▬ steady 0.184 m3/s
20 Sep 03:30 ▬ steady 0.184 m3/s
20 Sep 03:15 ▬ steady 0.184 m3/s
20 Sep 03:00 ▬ steady 0.184 m3/s
20 Sep 02:45 ▬ steady 0.184 m3/s
20 Sep 02:30 ▬ steady 0.184 m3/s
20 Sep 02:15 ▬ steady 0.184 m3/s
20 Sep 02:00 0.184 m3/s

Rainfall & Weather

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Flood history near this gauge

Official Environment Agency warnings issued since 2006 for the 9 flood areas linked to this gauge (nearest 1.2 km away).

5severe warnings 160flood warnings 500flood alerts

Most recent flood warning: 29 Jan 2026 — River Hayle from Relubbus to St Erth

Year by year
YearSevereWarningsAlerts
2026 0 1 16
2025 0 4 16
2024 0 23 36
2023 0 11 21
2022 0 4 9
2021 0 2 14
2020 0 24 46
2019 0 15 30
2018 0 16 47
2017 0 0 8
2016 0 19 37
2015 0 8 22
2014 4 12 59
2013 0 0 12
2012 0 8 25
2011 0 0 14
2010 0 2 20
2009 0 0 10
2008 1 2 9
2007 0 1 17
2006 0 8 32

Warnings apply to a whole flood area, not necessarily this exact spot. Years before 2006 aren't covered by the EA's historic record.

Nearby Stations

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Station Details

  • Monitoring Station: ST ERTH
  • Watercourse: —
  • Coordinates: 50°9'24"N 5°25'59"W (50.156796, -5.433024)
  • Open in: Google Maps · Apple Maps (opens your maps app)
  • Status: Active
  • Station Type: Flow gauging station (inferred)
  • Station Reference: E45728
  • Previous references: SW53F051 (to 2 Aug 2026)
  • Also at this site: St Erth (48125, level, reporting)
  • EA Gauge ID: E45728-flow-water-i-15_min-m3_s
  • Parameter: Flow
  • Unit: m3/s
  • Typical rise rate: 2 cm/hr (p95 sustained over 90 days)
  • Typical data delay: ~22 min (measured reading→publication lag)
  • Tidal: No
  • Lock / structure: No
  • Drainage Area: 48 km² upstream of this gauge
  • Flow Archive: National River Flow Archive ↗

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 response A 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
0.64
mixed response
Avg Annual Rainfall
1,136 mm/yr
1991–2020 · +8% since 1941–70
Urban Extent
0.8%
largely rural
Median Annual Flood
4.48 m³/s
QMED — typical yearly peak flow
Highest Daily Mean Flow
8.62 m³/s
1 Jan 2003 · daily mean, not the instantaneous peak
Flow-Duration Curve
mean 1.012.820.6960.2315% (high)% of days exceeded95% (low)
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 8%Grassland 44%Arable 41%Heath/scrub 4%Urban 3%
Grassland 47% → 44% since 1990

Flow affected by: groundwater abstraction, industrial / agricultural abstraction.

Photos

Gauging-station photographs from the National River Flow Archive (UKCEH).

7 May 2021 — Looking DS to hut and control from LHB 7 May 2021 Looking DS to hut and control from LHB 7 May 2021 — Looking US to hut 7 May 2021 Looking US to hut 22 Dec 2016 — High flow looking at weir downstream on 22-Dec-2012 13:44:00, Stage = 1.193m, Flow= 11 cumecs (approx) 22 Dec 2016 High flow looking at weir downstream on 22-Dec-2012 13:44:00, Stage = 1.193m, Flow= 11 cumecs (approx) 3 Apr 2015 — View DS to hut and weir 3 Apr 2015 View DS to hut and weir 3 Apr 2015 — Weir looking downstream 3 Apr 2015 Weir looking downstream 22 Dec 2012 — High flow looking upstream of weir on 22-Dec-2012 11:22:00 Stage = 1.266m, Flow = 11 cumecs (approx) 22 Dec 2012 High flow looking upstream of weir on 22-Dec-2012 11:22:00 Stage = 1.266m, Flow = 11 cumecs (approx) 22 Dec 2012 — Weir and upstream channel during high flow event 22 Dec 2012 Weir and upstream channel during high flow event NRFA gauging station photo NRFA gauging station photo

Photos © NRFA / UKCEH & the measuring authority — shown at web resolution. Full gallery on the NRFA ↗

About this gauge

Compound Crump weir with some issues from weed growth. Flows can be affected by mine drainage.

More detail

The catchment

Headwaters drain two moorland granite outcrops. Majority of the catchment is underlain by grits and shales of Devonian age, crossed by dyke swarms. Mining spoil in the floodplain. Generally low-grade agricultural use. Slow responding catchment with much storage. Historically some mining in catchment.

The station

Compound Crump profile weir. Width of middle crest of 1.22m and the two side crests of 1.675m each. Piers and wingwalls at a height of 1.83m with floodbanks at 3.8m. In 2023, eel pass tiles were installed along the left hand bank outer weir and fish bristles on the centre weir.

How it measures flow

High flows may go out of bank, but a flood channel ensures flow is contained. May drown at high flows. Weir was built in 1968 and superseded a velocity-area station for which it was not possible to derive a satisfactory rating curve because of variable weed growth. Weeds subsequently controlled by occasional cutting, but remained an issue. One peak flow rating valid across the Crump period of record. Rating confirmed by gaugings to 1.26 m. Max gauging during 12/2012 flood. Although weir drowned during this event existing rating was good. As this is the highest flood peak since the station opened, record can assumed to be good throughout.

Flow regime

Runoff influenced by groundwater abstraction/recharge. Abstraction for industrial/agricultural purposes. Mine drainage may moderately affect flows.

The flow record

Peak flows rejected pre-Crump (for 1957-1968) because variable weed growth made derivation of a satisfactory velocity-area rating impossible. Full period of record peak flow data reviewed and released in October 2018 (WINFAP Files v7) and in August 2024 (WINFAP Files v13).

Descriptions from the National River Flow Archive (UKCEH). NRFA station record ↗

Gauge Details

How this gauging station is built and how long it has measured (NRFA / UKCEH).

Gauge type
Gauging structure
Operating since
1957
Station datum
7.0 mAOD
Flow record
1957–2024 · 67 yrs · 86% complete
Peak-flow record
since 1957
Hydrometric area
49
Measured by
Environment Agency

Frequently asked questions

Is ST ERTH flooding today?

The latest recorded level is 0.18m. Compare it with the recent history on the chart above to judge whether levels are unusually high.

Is the river level rising or falling at ST ERTH?

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.

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.

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:

Check any UK postcode’s flood risk →

🏠 Buying or renting around here? Get the Property Flood-Risk Report for any English postcode — official risk band, recorded floods, warning history, river behaviour and nearby storm overflows. £19 one-off. Learn more →