L'Orge
3 monitoring stations on this water in France, holding 1,585 values between 1968 and 2026. The publisher names the water this gauge sits on without stating what kind of watercourse it is, so neither does Hydrionis.
The monitoring network on this water
Hydrionis holds 1,585 values from 3 gauges on this water. Discharge is a property of a gauge and its reach, not of this water as a whole, so this page reports the network and its records rather than a single figure.
The seasonal shape
An annual mean says how much water a river carried. A monthly record says when — and on most rivers the difference between a wet winter and a dry summer is larger than the difference between one year and the next.
Taken as the publisher computes it rather than recomputed by Hydrionis from daily values: the publisher knows which of its readings passed validation. Months the gauge did not cover are absent rather than interpolated, and the line breaks where they fall.
What the shaded periods are (1 event)
A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.
| Event | Type | Period | Standing | Authority |
|---|---|---|---|---|
| European drought | Drought declaration | 2022-05-01 – 2022-10-31 | Documented record | Compiled record |
View the data behind this chart
| Period | L'Orge à Saint-Chéron et à Sermaise (m³/s) |
|---|---|
| 1968 | 0.242 |
| 1969 | 0.194 |
| 1970 | 0.500 |
| 1971 | 0.213 |
| 1981 | 0.538 |
| 1982 | 0.724 |
| 1983 | 0.373 |
| 1984 | 0.430 |
| 1985 | 0.341 |
| 1986 | 0.321 |
| 1987 | 0.361 |
| 1988 | 0.537 |
| 1989 | 0.285 |
| 1990 | 0.314 |
| 1991 | 0.345 |
| 1992 | 0.230 |
| 1993 | 0.351 |
| 1994 | 0.512 |
| 1996 | 0.327 |
| 1997 | 0.363 |
| 1998 | 0.561 |
| 1999 | 0.478 |
| 2000 | 0.387 |
| 2001 | 0.767 |
| 2002 | 0.428 |
| 2003 | 0.557 |
| 2004 | 0.726 |
| 2005 | 0.382 |
| 2006 | 0.298 |
| 2007 | 0.273 |
| 2008 | 0.304 |
| 2009 | 0.307 |
| 2010 | 0.341 |
| 2011 | 0.352 |
| 2012 | 0.301 |
| 2013 | 0.346 |
| 2014 | 0.331 |
| 2015 | 0.271 |
| 2016 | 0.291 |
| 2017 | 0.221 |
| 2018 | 0.627 |
| 2019 | 0.282 |
| 2020 | 0.277 |
| 2021 | 0.408 |
| 2022 | 0.453 |
| 2023 | 0.308 |
| 2024 | 0.355 |
| 2025 | 0.871 |
| 2026 | 0.268 |
About this series
| Source | Office français de la biodiversité / SCHAPI — Hydrométrie — French river flow and stage · Licence Ouverte / Open Licence v2.0 (Etalab) |
|---|---|
| How the values came to exist | Measured |
| Period held | 1968–2026 |
| Completeness | 83.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated. |
| Known gaps |
|
| Continuity | The record begins in 1968 and is not continuous from it: 59 years separate the first value from the last, and 83% of the years between them are held. The span is not the record. |
| Last read from the publisher | 2026-10-01 |
| Redistribution | Permitted by the upstream licences |
| Commercial reuse | Permitted by the upstream licences. No Hydrionis access tier can widen this. |
| Methodology | How this was produced |
Every gauge Hydrionis holds here
| Gauge | Measures | Values | Record |
|---|---|---|---|
| L'Orge à Saint-Chéron et à Sermaise | mean monthly river flow | 576 | 1968–2026 |
| L'Orge à Morsang-sur-Orge | mean monthly river flow | 512 | 1984–2026 |
| L'Orge à Épinay-sur-Orge | mean monthly river flow | 497 | 1982–2026 |
How these gauges were attached to this water
Named by the publisher Each gauge here names this water in the publisher’s own station record. Hydrionis has not inferred the connection from station names.
| Gauge | Evidence | Established |
|---|---|---|
| L'Orge à Saint-Chéron et à Sermaise | Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites | 2026-10-02 |
| L'Orge à Morsang-sur-Orge | Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites | 2026-10-02 |
| L'Orge à Épinay-sur-Orge | Stated by the publisher — Hub'Eau hydrometry site reference, libelle_cours_eau, code_cours_eau and surface_bv fields — https://hubeau.eaufrance.fr/api/v2/hydrometrie/referentiel/sites | 2026-10-02 |
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.
| Signal | Held | Counts |
|---|---|---|
| Gauges holding a real record | 3 | yes, 3 or more |
| Years spanned | 59 | yes, 20 or more |
| Values held | 1,585 | yes, 1000 or more |
| Distinct measurements | 1 | no |
| Publishers measuring it | 1 | no |
| Official identifiers | 2 | recorded, not counted |
Use this data
Use this data
- Machine-readable JSON
/api/v1/observations/by-subject/gauge-fr-f4610001.json - How to cite this, and who you must credit
- How these figures were produced
- Request this at a different scale, format or geography
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.
Source: Hub’Eau / Système d’information sur l’eau, under Licence Ouverte (Etalab).
- Office français de la biodiversité / SCHAPI — Licence Ouverte / Open Licence v2.0 (Etalab) (licence text)
Suggested citation for Hydrionis
Hydrionis (2026), L'Orge gauge records, accessed 2026-10-05, hydrionis.com/waters/france-lorge/
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.
Where these figures come from
Source: Hub'Eau — Hydrométrie — French river flow and stage, F4610001. Licence: Open — attribution required (attribution required).
Method: Monthly mean discharge (QmM) computed by the publisher from its validated sub-hourly record, reported in litres per second and converted to cubic metres per second as they are collected. Where a site has been measured by more than one station, the station with the longest published series is used rather than blending stations whose values for the same month can differ.
Measured on L'Orge.
Retrieved 1 October 2026.