Cut Off Channel — monitoring and records

The monitoring network on this water

Hydrionis holds 1,275 values from 4 gauges on this water. Discharge is a property of a gauge and its reach, not of this water as a whole, so this page reports the network and its records rather than a single figure.

Gauges

1,275

Values held

1969–2025

Record spans

Gauges on the Cut Off Channel

4 monitoring points, positioned as the publisher records them.

The seasonal shape

An annual mean says how much water a river carried. A monthly record says when — and on most rivers the difference between a wet winter and a dry summer is larger than the difference between one year and the next.

Monthly mean flow at Cut-off Channel at Tollgate

Each month's mean discharge as the publisher computed it, which shows the seasonal shape an annual mean flattens away. 1969–2025.

Show relevant events (4 events)Shading marks when something was recorded, not what caused the line.

Taken as the publisher computes it rather than recomputed by Hydrionis from daily values: the publisher knows which of its readings passed validation. Months the gauge did not cover are absent rather than interpolated, and the line breaks where they fall.

What the shaded periods are (4 events)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
The 1976 drought	Drought declaration	1975-05-01 – 1976-08-31	Documented record	Compiled record
Yorkshire drought	Drought declaration	1995-04-01 – 1996-03-31	Documented record	Compiled record
The 2022 drought	Drought declaration	2022-03-01 – 2022-10-31	Documented record	Compiled record
European drought	Drought declaration	2022-05-01 – 2022-10-31	Documented record	Compiled record

Not shown on this chart

Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Hurricane Katrina water and sanitation collapse — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	Cut-off Channel at Tollgate (m³/s)
1969	0.045
1970	0.038
1971	0.261
1972	0.190
1973	0.015
1974	0.094
1975	0.377
1976	0.060
1977	0.060
1978	0.111
1979	0.047
1980	0.021
1981	0.020
1982	0.124
1983	0.177
1984	0.346
1985	0.132
1986	0.045
1987	0.017
1988	0.937
1989	0.137
1990	0.398
1991	0.157
1992	0.028
1993	0.079
1994	0.128
1995	0.227
1996	0.309
1997	0.182
1998	0.065
1999	0.160
2000	0.030
2001	0.998
2002	0.175
2003	0.337
2004	0.143
2005	0.059
2006	0.097
2007	0.098
2008	0.151
2009	0.127
2010	0.107
2011	0.316
2012	0.116
2013	0.368
2014	0.171
2015	0.123
2016	0.213
2017	0.096
2018	0.160
2019	0.052
2020	0.061
2021	0.334
2022	0.028
2023	0.149
2024	0.063
2025	0.156

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	Environment Agency — Hydrology Data Explorer API · Open Government Licence v3.0
How the values came to exist	Measured
Period held	1969–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1969 to 2025 is held.
Last read from the publisher	2026-08-24
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds here

Gauges on the Cut Off Channel and what each holds
Gauge	Measures	Values	Record
Cut-off Channel at Tollgate	mean river flow, mean monthly river flow	690	1969–2025
CUT OFF CHANNEL	ept family richness, life flow index (family level), proportion of sediment-sensitive invertebrates, whpt average score per taxon, whpt number of scoring taxa	240	1985–2015
CUT OFF CHANNEL	ept family richness, life flow index (family level), proportion of sediment-sensitive invertebrates, whpt average score per taxon, whpt number of scoring taxa	180	1989–2015
CUT OFF CHANNEL	ept family richness, life flow index (family level), proportion of sediment-sensitive invertebrates, whpt average score per taxon, whpt number of scoring taxa	165	1995–2015

How these gauges were attached to this water

Named by the publisher Each gauge here names this water in the publisher’s own station record. Hydrionis has not inferred the connection from station names.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
Cut-off Channel at Tollgate	Stated by the publisher — Environment Agency hydrology station register, riverName field — https://environment.data.gov.uk/hydrology/id/stations	2026-08-26
CUT OFF CHANNEL	Stated by the publisher on the record this gauge’s observations came from.	With the observations
CUT OFF CHANNEL	Stated by the publisher on the record this gauge’s observations came from.	With the observations
CUT OFF CHANNEL	Stated by the publisher on the record this gauge’s observations came from.	With the observations

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	4	yes, 3 or more
Years spanned	57	yes, 20 or more
Values held	1,275	yes, 1000 or more
Distinct measurements	7	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-ea-db1d776d-2226-4979-8b90-733c0f352d32.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Attribution you are required to give

These are conditions of the licences the underlying data is published under. They are obligations to the publishers, not to Hydrionis, and they apply to you directly whether or not you mention Hydrionis at all.

Contains public sector information licensed under the Open Government Licence v3.0.

Environment Agency — Open Government Licence v3.0 (licence text)

Suggested citation for Hydrionis

Hydrionis (2026), Cut Off Channel gauge records, accessed 2026-09-02, hydrionis.com/waters/england-cut-off-channel/

Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Cut Off Channel gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

Where these figures come from

Spatially aggregatedHigh confidence2022

Source: EA — Hydrology Data Explorer API, EA measure db1d776d-2226-4979-8b90-733c0f352d32-flow-m-86400-m3s-qualified. Licence: Open — attribution required (attribution required).

Method: Mean of the twelve monthly means for the year. Computed from months rather than from daily readings directly, so that a year with uneven observation is not weighted toward its best-observed months. Years with any month missing are not published.

Aggregated by Hydrionis from daily mean flow published by the Environment Agency under the Open Government Licence v3.0.

Retrieved 24 August 2026.