The monitoring network within this area

Hydrionis holds 215,378 values from 10 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.

10

Gauges

215,378

Values held

1900–2026

Record spans

4,441 km²

Area

Gauges within the Emån drainage basin

10 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 BLANKASTRÖM's whole daily record between 1928 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.

5.200 m³/s

Q95 low flow

18.000 m³/s

Q50 median flow

48.000 m³/s

Q10 high flow

Largest day of each water year at BLANKASTRÖM

The highest daily mean discharge in each October-to-September water year, 1928–2024.

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	BLANKASTRÖM (m³/s)
1928	132
1929	36.0
1930	164
1931	30.0
1932	36.0
1933	29.0
1934	63.0
1935	132
1936	100
1937	91.0
1938	68.0
1939	96.0
1940	49.0
1941	58.0
1942	115
1943	60.0
1944	132
1945	84.0
1946	77.0
1947	72.0
1948	27.0
1949	84.0
1950	222
1951	58.0
1952	96.0
1953	57.0
1954	70.0
1955	48.0
1956	56.0
1957	127
1958	88.0
1959	42.0
1960	99.0
1961	81.0
1962	60.0
1963	54.0
1964	44.0
1965	189
1966	126
1967	113
1968	126
1969	143
1970	87.0
1971	52.0
1972	39.0
1973	53.0
1974	84.0
1975	21.0
1976	153
1977	91.0
1978	95.0
1979	49.0
1980	87.0
1981	63.0
1982	80.0
1983	44.0
1984	118
1985	102
1986	58.0
1987	101
1988	43.0
1989	81.0
1990	72.0
1991	33.0
1992	46.0
1993	90.0
1994	92.0
1995	49.6
1996	50.4
1997	65.3
1998	76.5
1999	42.1
2000	72.4
2001	101
2002	132
2003	78.5
2004	92.0
2005	101
2006	118
2007	67.9
2008	56.3
2009	123
2010	93.1
2011	110
2012	72.2
2013	48.0
2014	50.2
2015	37.6
2016	20.7
2017	73.4
2018	50.6
2019	67.8
2020	34.6
2021	57.9
2022	80.1
2023	96.0
2024	41.1

The longest record here

Mean river flow at BLANKASTRÖM

Annual means of the daily record, 1928–2025. 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	BLANKASTRÖM (m³/s)
1928	32.9
1929	24.2
1930	27.4
1931	36.6
1932	14.6
1933	12.7
1934	13.8
1935	20.0
1936	31.5
1937	22.4
1938	17.0
1939	18.3
1940	17.1
1941	12.3
1942	17.4
1943	24.7
1944	28.7
1945	34.7
1946	38.6
1947	15.8
1948	26.7
1949	14.4
1950	30.3
1951	33.9
1952	29.7
1953	23.0
1954	26.5
1955	21.2
1956	16.7
1957	27.8
1958	32.8
1959	25.3
1960	27.2
1961	34.8
1962	32.0
1963	18.1
1964	12.0
1965	18.9
1966	38.9
1967	33.3
1968	27.5
1969	28.5
1970	29.3
1971	17.6
1972	16.5
1973	15.4
1974	22.9
1975	22.9
1976	8.89
1977	32.8
1978	24.5
1979	25.1
1980	25.1
1981	28.2
1982	19.9
1983	20.8
1984	25.1
1985	32.6
1986	27.3
1987	27.1
1988	38.1
1989	14.3
1990	21.2
1991	20.2
1992	15.7
1993	17.1
1994	30.6
1995	31.2
1996	17.4
1997	18.2
1998	35.9
1999	27.1
2000	24.3
2001	27.0
2002	25.6
2003	22.1
2004	30.5
2005	21.0
2006	31.2
2007	40.2
2008	28.2
2009	16.5
2010	31.9
2011	25.3
2012	29.2
2013	22.8
2014	21.4
2015	18.7
2016	9.80
2017	14.3
2018	19.2
2019	14.1
2020	18.9
2021	19.6
2022	15.2
2023	23.2
2024	24.5
2025	12.2

Every gauge Hydrionis holds within this area

Gauges within the Emån and what each holds
Gauge	Measures	Values	Record
BLANKASTRÖM	mean river flow	35,824	1928–2026
BRUSAFORS	mean river flow	26,550	1954–2026
EMSFORS	mean river flow	26,246	1954–2026
SKÄRSBODA	mean river flow	23,982	1961–2026
FORSHULTESJÖN NEDRE	mean river flow	23,865	1954–2020
JÄRNFORSEN	mean river flow	22,361	1900–1961
STENINGE	mean river flow	20,122	1965–2020
RÖDJENÄS	mean river flow	19,145	1909–1961
STENSÅKRA	mean river flow	15,457	1984–2026
KLÄMMA	mean river flow	1,826	1931–1935

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 — 74000. 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
BLANKASTRÖM	Stated by the publisher on the record this gauge’s observations came from.	With the observations
BRUSAFORS	Stated by the publisher on the record this gauge’s observations came from.	With the observations
EMSFORS	Stated by the publisher on the record this gauge’s observations came from.	With the observations
SKÄRSBODA	Stated by the publisher on the record this gauge’s observations came from.	With the observations
FORSHULTESJÖN NEDRE	Stated by the publisher on the record this gauge’s observations came from.	With the observations
JÄRNFORSEN	Stated by the publisher on the record this gauge’s observations came from.	With the observations
STENINGE	Stated by the publisher on the record this gauge’s observations came from.	With the observations
RÖDJENÄS	Stated by the publisher on the record this gauge’s observations came from.	With the observations
STENSÅKRA	Stated by the publisher on the record this gauge’s observations came from.	With the observations
KLÄMMA	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	10	yes, 3 or more
Years spanned	127	yes, 20 or more
Values held	215,378	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-1806.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), Emån gauge records, accessed 2026-10-05, hydrionis.com/waters/sweden-eman/

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 Emån 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 confidence2026-01-30

Source: SMHI — Swedish hydrological observations, 1806. 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 2026-01-03 to 2026-01-30 (not yet checked). Station in the EMÅN main drainage basin, 3,939 km². Discharge is a property of this gauge and this reach, not of the river as a whole.

Retrieved 1 October 2026.