The monitoring network within this area

Hydrionis holds 61,559 values from 6 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.

6

Gauges

61,559

Values held

1976–2026

Record spans

387 km²

Area

Gauges within the Söderköpingsån drainage basin

6 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 RYTTARBACKEN's whole daily record between 1976 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.

0.000 m³/s

Q95 low flow

0.011 m³/s

Q50 median flow

0.102 m³/s

Q10 high flow

Largest day of each water year at RYTTARBACKEN

The highest daily mean discharge in each October-to-September water year, 1976–2025.

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	RYTTARBACKEN (m³/s)
1976	1.22
1977	1.33
1978	0.820
1979	0.630
1980	1.15
1981	1.03
1982	0.440
1983	0.530
1984	1.09
1985	1.09
1986	1.11
1987	0.880
1988	0.730
1989	0.500
1990	0.540
1991	0.460
1992	0.670
1993	0.980
1994	0.980
1995	0.900
1996	0.520
1997	0.630
1998	0.830
1999	0.650
2000	0.970
2001	1.06
2002	0.690
2003	0.650
2004	0.920
2005	0.960
2006	0.840
2007	0.410
2008	0.430
2009	0.880
2010	0.680
2011	0.990
2012	1.15
2013	0.690
2014	1.01
2015	0.440
2016	0.220
2018	0.460
2019	0.560
2020	0.730
2021	0.600
2022	1.04
2023	0.920
2024	0.780
2025	0.300

The longest record here

Mean river flow at RYTTARBACKEN

Annual means of the daily record, 1976–2025. 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	RYTTARBACKEN (m³/s)
1976	0.010
1977	0.084
1978	0.067
1979	0.048
1980	0.055
1981	0.049
1982	0.045
1983	0.035
1984	0.037
1985	0.090
1986	0.048
1987	0.039
1988	0.062
1989	0.017
1990	0.038
1991	0.027
1992	0.025
1993	0.035
1994	0.051
1995	0.054
1996	0.026
1997	0.031
1998	0.064
1999	0.041
2000	0.058
2001	0.054
2002	0.055
2003	0.033
2004	0.034
2005	0.038
2006	0.066
2007	0.041
2008	0.040
2009	0.027
2010	0.059
2011	0.049
2012	0.068
2013	0.050
2014	0.039
2015	0.047
2016	0.015
2017	0.032
2018	0.032
2019	0.026
2020	0.020
2021	0.032
2022	0.023
2023	0.063
2024	0.056
2025	0.027

Every gauge Hydrionis holds within this area

Gauges within the Söderköpingsån and what each holds
Gauge	Measures	Values	Record
RYTTARBACKEN	mean river flow	18,491	1976–2026
HÄLLA	mean river flow	15,821	1983–2026
SÖDERKÖPING	mean river flow	12,415	1990–2026
KUNTEBO	mean river flow	7,251	1984–2005
GRUVSJÖBÄCKEN	mean river flow	6,546	1986–2006
Hestadbäcken HE 30 VM	mean river flow	1,035	2010–2013

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 — 68000. 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
RYTTARBACKEN	Stated by the publisher on the record this gauge’s observations came from.	With the observations
HÄLLA	Stated by the publisher on the record this gauge’s observations came from.	With the observations
SÖDERKÖPING	Stated by the publisher on the record this gauge’s observations came from.	With the observations
KUNTEBO	Stated by the publisher on the record this gauge’s observations came from.	With the observations
GRUVSJÖBÄCKEN	Stated by the publisher on the record this gauge’s observations came from.	With the observations
Hestadbäcken HE 30 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 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	6	yes, 3 or more
Years spanned	51	yes, 20 or more
Values held	61,559	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-2170.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), Söderköpingsån gauge records, accessed 2026-10-05, hydrionis.com/waters/sweden-soderkopingsan/

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 Söderköpingsån 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, 2170. 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 2026-02-01 to 2026-09-30 (not yet checked). Station in the SÖDERKÖPINGSÅN main drainage basin, 7 km². Discharge is a property of this gauge and this reach, not of the river as a whole.

Retrieved 1 October 2026.