Rivers - Metropolis 2019 - BD Topage®

Dataset of rivers of metropolitan France BD Topage® version 2019

There is no standard definition of what a watercourse is. The codification of watercourses is the responsibility of the managers of the repository (Water Agencies, in consultation with IGN-OFB-Etat).
Codification choices are essentially influenced by a topographical approach, based on terrain toponymy where it exists. The criteria of drain length, flow rates, permanence of flow can be used, in the absence of clear and convergent sources on toponymy.
One of the founding roles of the repository for the water information system is to propose an identification of hydrographic objects in the form of stable, consensual codes that can be used to produce and maintain derived repositories, or to hang up business data (scrubbing stations, etc.)
The choice of the watercourse is generally not influenced by one of these particular uses, sometimes contradictory between them.

Note: The management of transboundary watercourses is as follows:
- Cases of rivers on the border (crossing the border): the geometry of it will be integrated in its entirety;
- Cases of rivers crossing the border once: a common cross-border hydrographic node will be shared between the two countries (pending clear border delimitations);
- Cases of rivers travelling back and forth between the two countries: the geometry of the latter will be integrated in its entirety for the part between its first and last A/R on the border (even for the part located in the neighbouring country).

Corresponds to the "Watercourse" concept of Inspire.