The monitoring network within this area

Hydrionis holds 22,518 values from 2 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

2

Gauges

22,518

Values held

1967–2026

Record spans

2,312 km²

Area

Gauges within the Gavleån drainage basin

2 monitoring points, positioned as the publisher records them.

How low, how high and how variable this gauge runs

A hydrograph says what happened; these say how often. Read off TOLVFORS KRV's whole daily record between 1967 and 2026, they describe the shape of the record rather than any day in it — and they belong to this gauge and its reach, not to this drainage area.

2.000 m³/s

Q95 low flow

14.300 m³/s

Q50 median flow

35.200 m³/s

Q10 high flow

Largest day of each water year at TOLVFORS KRV

The highest daily mean discharge in each October-to-September water year, 1967–2025.

These are the largest daily means, not flood peaks. A peak lasting hours is averaged across a whole day here, so the true instantaneous maximum on the same day was higher — sometimes far higher on a fast-responding catchment. Flood frequency work needs a publisher's own instantaneous series; Hydrionis holds one for 2,236 American gauges and not for this one, so the two are never drawn together. A water year the gauge did not substantially cover produces no value at all rather than a low one.

View the data behind this chart

Underlying data
Period	TOLVFORS KRV (m³/s)
1967	44.0
1968	106
1969	108
1970	42.0
1971	40.0
1972	28.0
1973	25.0
1974	114
1975	13.0
1976	152
1977	46.0
1978	95.0
1979	38.0
1980	90.0
1981	98.0
1982	79.0
1983	74.0
1984	150
1985	169
1986	51.0
1987	93.0
1988	62.0
1989	51.0
1990	61.0
1991	67.0
1992	90.0
1993	62.0
1994	126
1995	29.0
1996	36.4
1997	36.9
1998	112
1999	84.0
2000	106
2001	75.8
2002	65.5
2003	43.3
2004	34.7
2005	63.6
2006	95.7
2007	48.6
2008	79.8
2009	56.4
2010	96.3
2011	56.5
2012	79.1
2013	29.6
2014	57.1
2015	49.1
2016	43.2
2017	127
2018	80.5
2019	97.3
2020	129
2021	62.7
2022	156
2023	114
2024	36.5
2025	56.6

The longest record here

Mean river flow at TOLVFORS KRV

Annual means of the daily record, 1967–2025. One gauge, not this drainage area.

Annual means computed by Hydrionis from the published daily record, drawn only for years with at least 300 days held. They summarise this gauge's own record and say nothing about any other watercourse in this area.

View the data behind this chart

Underlying data
Period	TOLVFORS KRV (m³/s)
1967	27.7
1968	17.0
1969	21.4
1970	17.6
1971	15.0
1972	12.4
1973	11.5
1974	21.5
1975	14.0
1976	8.05
1977	29.6
1978	17.5
1979	17.8
1980	17.9
1981	27.8
1982	23.4
1983	22.9
1984	23.2
1985	27.8
1986	29.0
1987	22.9
1988	19.9
1989	13.2
1990	18.2
1991	18.9
1992	15.4
1993	14.2
1994	17.0
1995	24.8
1996	9.61
1997	12.8
1998	22.5
1999	21.9
2000	27.3
2001	20.6
2002	19.0
2003	16.4
2004	16.5
2005	12.5
2006	23.8
2007	12.7
2008	19.7
2009	22.3
2010	18.5
2011	15.8
2012	23.4
2013	11.2
2014	11.5
2015	14.9
2016	14.9
2017	14.6
2018	19.6
2019	21.6
2020	16.7
2021	25.7
2022	9.81
2023	34.6
2024	18.5
2025	16.7

Every gauge Hydrionis holds within this area

Gauges within the Gavleån and what each holds
Gauge	Measures	Values	Record
TOLVFORS KRV	mean river flow	21,817	1967–2026
Lumsheden-Midge VM	mean river flow	701	2013–2016

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 52000. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
TOLVFORS KRV	Stated by the publisher on the record this gauge’s observations came from.	With the observations
Lumsheden-Midge VM	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 2 of them, which makes it a profile, not indexed.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	60	yes, 20 or more
Values held	22,518	yes, 1000 or more
Distinct measurements	1	no
Publishers measuring it	1	no
Official identifiers	2	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/se-smhi-1940.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.

Data from Sveriges meteorologiska och hydrologiska institut, used under CC BY 4.0.

Sveriges meteorologiska och hydrologiska institut — CC BY 4.0 (licence text)

Suggested citation for Hydrionis

Hydrionis (2026), Gavleån gauge records, accessed 2026-10-05, hydrionis.com/waters/sweden-gavlean/

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 Gavleån 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

MeasuredMedium confidence2026-09-30

Source: SMHI — Swedish hydrological observations, 1940. Licence: Open — attribution required (attribution required).

Method: Daily discharge exactly as SMHI publishes it, from its corrected archive. SMHI computes the daily value from its own sub-daily measurement and rating curves; Hydrionis does not recompute it, because a mean derived from whatever sub-daily data happens to be exposed would be a different statistic under the same name.

Checked and approved by SMHI except 2002-12-31 to 2002-12-31 (not yet checked), 2026-01-18 to 2026-09-30 (not yet checked). Station in the GAVLEÅN main drainage basin, 2,312 km². Discharge is a property of this gauge and this reach, not of the river as a whole.

Retrieved 1 October 2026.