Walloon Hydrographic Network - Series

This series of data layers includes information on the rivers of the Walloon hydrographic network as well as the areas of uncertainty remaining there. The Walloon Hydrographic Network, which was originally based on the digitization of the plates of the paper Atlases of Non-navigable Watercourses (Atlas of the CENNs) established between 1950 and 1967, has been completely revised by combining data from the PICC, the IGN and the Atlas of the CENNs. This network, called "Walloon Hydrographic Network" covers the entire Walloon territory and provides all known administrative information, with the most up-to-date planimetric and topological accuracy. This data is projected in Lambert 2008 and is an enrichment of the RHW_31370 dataset, available at the following URL https://geoportail.wallonie.be/catalogue/33c16acd-7047-4129-82b6-684dc8…. Thus, this enriched series is composed of four layers of data: 1. The axes of the Walloon Hydrographic Network This linear data layer includes non-navigable watercourses within the meaning of the Law of 28 December 1967, namely any watercourse which is not classified by the Government as a navigable watercourse and which is located downstream of its point of origin. Non-navigable rivers are segmented into 1st, 2nd and 3rd categories. The data layer also includes waterways managed by the Direction de l'Exploitation des Voies navigables (SPW - Mobilité et Infrastructures - Département de l'Exploitation des infrastructures - Direction de l'Exploitation des Voies navigables), unclassified non-navigable watercourses (managed by residents or owners) and flows that are not visible on the surface. 2. The rights of way of the Walloon Hydrographic Network This surface data layer determines the minor bed of non-navigable watercourses within the meaning of the Water Code, i.e. the surface entity containing a single stretch of watercourses, bounded upstream and downstream by a node and representing the domain of the watercourse manager (from crest to crest or its approximation). 3. The nodes of the Walloon hydrographic network This point data layer represents the beginning, end, or crossing of a watercourse's known course or where it undergoes a change in its state (surface or non-surface) or category. 4. Areas of uncertainty of the Walloon Hydrographic Network This data layer reproduces, in the form of polygons, various uncertainties recorded on the linear of watercourses. More information on these sheets is available in their descriptive sheets (to be found in the associated resources). Accurate knowledge of the hydrographic network and its administrative and legal characteristics is a major element of the framework on which environmental management relating to water can be built (e.g. the Water Directive: state of play and management plans). The use of this network via a Geographic Information System (GIS) allows a fast and integrated vision of spatial information. The analysis of interactions or constraints at a particular point of the river is facilitated by overlapping with other themes (flood zones, Natura 2000, quality objectives, bathing areas and upstream areas, kayaks, permits and authorisations, etc.). As a result, these large-scale data layers are the benchmark for river managers. The Walloon hydrographic network can be consulted through two visualisation services: a detailed view and a simplified view. The services are distinguished by the name and symbology applied to each data layer and the available attributes (reduced in simplified view)