The monitoring network within this area

Hydrionis holds 29,625 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

29,625

Values held

1964–2026

Record spans

186 km²

Area

Gauges within the Sege Å 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 SVEDALA's whole daily record between 1964 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.

0.034 m³/s

Q95 low flow

0.224 m³/s

Q50 median flow

0.962 m³/s

Q10 high flow

Largest day of each water year at SVEDALA

The highest daily mean discharge in each October-to-September water year, 1964–2025.

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	SVEDALA (m³/s)
1964	0.790
1965	2.03
1966	1.61
1967	2.26
1968	0.740
1969	3.21
1970	1.52
1971	1.03
1972	0.850
1973	1.18
1974	1.51
1975	0.740
1976	2.00
1977	1.54
1978	2.52
1979	1.40
1980	2.31
1981	2.30
1982	2.22
1983	2.06
1984	1.56
1985	3.45
1986	2.46
1987	2.04
1988	1.25
1989	1.16
1990	1.86
1991	1.47
1992	2.51
1993	2.35
1994	3.38
1995	0.890
1996	1.62
1997	2.53
1998	3.39
1999	2.45
2000	1.65
2001	2.97
2002	1.64
2003	1.54
2004	2.76
2005	1.59
2006	2.86
2007	1.22
2008	1.04
2009	1.30
2010	3.19
2011	1.69
2012	1.63
2013	1.60
2014	2.35
2015	2.09
2016	1.49
2017	1.60
2018	1.80
2019	1.46
2020	1.72
2021	2.40
2022	2.22
2023	3.45
2024	1.49
2025	0.710

The longest record here

Mean river flow at SVEDALA

Annual means of the daily record, 1965–2025. 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	SVEDALA (m³/s)
1965	0.212
1966	0.477
1967	0.390
1968	0.341
1969	0.191
1970	0.411
1971	0.199
1972	0.159
1973	0.175
1974	0.307
1975	0.299
1976	0.105
1977	0.343
1978	0.353
1979	0.369
1980	0.531
1981	0.710
1982	0.319
1983	0.408
1984	0.403
1985	0.465
1986	0.342
1987	0.399
1988	0.549
1989	0.238
1990	0.286
1991	0.467
1992	0.397
1993	0.506
1994	0.844
1995	0.628
1996	0.255
1997	0.263
1998	0.657
1999	0.675
2000	0.550
2001	0.296
2002	0.450
2003	0.212
2004	0.406
2005	0.343
2006	0.496
2007	0.704
2008	0.327
2009	0.186
2010	0.404
2011	0.548
2012	0.359
2013	0.285
2014	0.487
2015	0.428
2016	0.321
2017	0.489
2018	0.310
2019	0.304
2020	0.303
2021	0.442
2022	0.357
2023	0.625
2024	0.490
2025	0.186

Every gauge Hydrionis holds within this area

Gauges within the Sege Å and what each holds
Gauge	Measures	Values	Record
SVEDALA	mean river flow	22,644	1964–2026
LILLA MÖLLEBERGA	mean river flow	5,370	1964–1979
SKABERSJÖ	mean river flow	1,611	1993–2000

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 — 90000. 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
SVEDALA	Stated by the publisher on the record this gauge’s observations came from.	With the observations
LILLA MÖLLEBERGA	Stated by the publisher on the record this gauge’s observations came from.	With the observations
SKABERSJÖ	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	63	yes, 20 or more
Values held	29,625	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-1879.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), Sege Å gauge records, accessed 2026-10-05, hydrionis.com/waters/sweden-sege-a/

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 Sege Å 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, 1879. 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 2026-01-04 to 2026-09-30 (not yet checked). Station in the SEGE Å main drainage basin, 52 km². Discharge is a property of this gauge and this reach, not of the river as a whole.

Retrieved 1 October 2026.