The monitoring network within this area

Hydrionis holds 62,207 values from 3 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.

3

Gauges

62,207

Values held

1920–2026

Record spans

1,333 km²

Area

Gauges within the Alsterån drainage basin

3 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 GETEBRO's whole daily record between 1920 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.

0.633 m³/s

Q95 low flow

6.600 m³/s

Q50 median flow

22.300 m³/s

Q10 high flow

Largest day of each water year at GETEBRO

The highest daily mean discharge in each October-to-September water year, 1920–2025.

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	GETEBRO (m³/s)
1920	13.6
1921	37.0
1922	29.0
1923	81.0
1924	12.7
1925	46.0
1926	33.0
1927	28.0
1928	60.0
1929	25.0
1930	68.0
1931	21.0
1932	22.0
1933	21.0
1934	35.0
1935	75.0
1936	49.0
1937	52.0
1938	36.0
1939	68.0
1940	39.0
1941	32.0
1942	42.0
1943	27.0
1944	43.0
1945	37.0
1946	27.0
1947	48.0
1948	12.4
1949	52.0
1950	92.0
1951	24.0
1952	54.0
1953	27.0
1954	37.0
1955	34.0
1956	30.0
1957	61.0
1958	42.0
1959	40.0
1960	48.0
1961	28.0
1962	33.0
1963	26.0
1964	18.7
1965	65.0
1966	54.0
1967	58.0
1968	44.0
1969	89.0
1970	45.0
1971	33.0
1972	22.0
1973	23.0
1974	34.0
1975	15.3
1976	74.6
1977	49.9
1978	57.0
1979	37.0
1980	46.0
1981	33.0
1982	33.0
1983	22.2
1984	58.3
1985	41.4
1986	44.9
1987	46.7
1988	16.9
1989	32.3
1990	33.9
1991	15.6
1992	25.4
1993	44.2
1994	42.3
1995	43.4
1996	24.4
1997	24.1
1998	32.5
1999	22.3
2000	34.9
2001	50.2
2002	29.7
2003	36.1
2004	28.3
2005	49.7
2006	38.2
2007	28.6
2008	30.8
2009	54.8
2010	58.3
2011	26.6
2012	33.8
2013	15.2
2014	22.3
2015	12.1
2016	23.0
2017	32.6
2018	28.2
2019	39.3
2020	19.1
2021	37.4
2022	40.6
2023	28.3
2024	19.9
2025	22.6

The longest record here

Mean river flow at GETEBRO

Annual means of the daily record, 1920–2025. 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	GETEBRO (m³/s)
1920	8.87
1921	3.83
1922	8.06
1923	13.6
1924	13.6
1925	6.00
1926	10.5
1927	14.5
1928	14.6
1929	9.35
1930	12.9
1931	13.0
1932	6.38
1933	7.98
1934	7.48
1935	9.97
1936	13.7
1937	9.02
1938	7.10
1939	7.29
1940	8.50
1941	6.15
1942	6.88
1943	9.83
1944	12.1
1945	12.6
1946	13.1
1947	6.59
1948	10.6
1949	7.13
1950	14.3
1951	12.6
1952	14.1
1953	7.23
1954	8.05
1955	8.57
1956	8.75
1957	9.17
1958	13.1
1959	8.85
1960	16.8
1961	12.6
1962	9.01
1963	7.38
1964	3.41
1965	9.26
1966	15.6
1967	11.6
1968	9.99
1969	10.3
1970	14.4
1971	5.70
1972	7.02
1973	5.97
1974	10.1
1975	8.51
1976	5.15
1977	12.7
1978	9.98
1979	10.7
1980	10.0
1981	10.7
1982	6.63
1983	7.15
1984	13.8
1985	12.5
1986	10.2
1987	10.6
1988	16.8
1989	5.15
1990	6.77
1991	7.39
1992	6.80
1993	8.86
1994	15.1
1995	12.3
1996	9.46
1997	8.05
1998	11.6
1999	9.73
2000	10.5
2001	11.8
2002	10.6
2003	8.44
2004	12.5
2005	7.86
2006	12.4
2007	14.1
2008	12.1
2009	7.37
2010	14.0
2011	11.1
2012	10.3
2013	9.20
2014	8.50
2015	7.24
2016	6.02
2017	6.31
2018	9.06
2019	7.57
2020	8.04
2021	9.96
2022	6.31
2023	8.32
2024	8.93
2025	4.82

Every gauge Hydrionis holds within this area

Gauges within the Alsterån and what each holds
Gauge	Measures	Values	Record
GETEBRO	mean river flow	38,990	1920–2026
STRÖMSBORG	mean river flow	16,778	1980–2026
SKAHUS	mean river flow	6,439	1983–2001

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 — 75000. 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
GETEBRO	Stated by the publisher on the record this gauge’s observations came from.	With the observations
STRÖMSBORG	Stated by the publisher on the record this gauge’s observations came from.	With the observations
SKAHUS	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 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	3	yes, 3 or more
Years spanned	107	yes, 20 or more
Values held	62,207	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-855.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), Alsterån gauge records, accessed 2026-10-05, hydrionis.com/waters/sweden-alsteran/

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 Alsterån 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, 855. 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 1973-01-01 to 1979-08-15 (not yet checked), 1979-08-25 to 1980-12-31 (not yet checked), 2026-01-24 to 2026-09-30 (not yet checked). Station in the ALSTERÅN main drainage basin, 1,333 km². Discharge is a property of this gauge and this reach, not of the river as a whole.

Retrieved 1 October 2026.