Linear Water Stream
This layer maps the linear watercourse continuities of France's Green and Blue Network (Trame Verte et Bleue) — the "blue" element, formed by rivers and streams that con…
Category: Transition risks · Sensitive areas · Critical areas · SRCE (France) Coverage: Country (France) Format: Boundary polygons Used in risk analysis: No (contextual layer; not used in materiality scoring)
What it shows
This layer maps the linear watercourse continuities of France's Green and Blue Network (Trame Verte et Bleue) — the "blue" element, formed by rivers and streams that connect aquatic and riparian habitats. It matters because activity along these watercourses can disrupt freshwater ecological continuity and the movement of species through the river network.
How it is built
France's Green and Blue Network is a biodiversity-preservation tool that integrates the maintenance and strengthening of natural-environment functionality into planning and development. It is defined at the regional level through the Regional Schemes of Ecological Coherence (SRCE). The ecological continuities it identifies include biodiversity reservoirs and ecological corridors; this layer captures the linear watercourse element of those continuities. It is delivered as mapped polygons.
How to read it
This is a boundary layer. A site that intersects, or lies close to, a mapped watercourse continuity should be flagged, since these streams are part of the connective freshwater network and any disruption can reduce ecological continuity.
Source
Regional Schemes of Ecological Coherence (SRCE), France — methodology after Allag-Dhuisme et al. (2010), via trameverteetbleue.fr.
Comparison with the WWF Risk Filter Suite
There is no global equivalent in the WWF Risk Filter Suite. As a French regional freshwater-connectivity dataset, it loosely supports WWF's ecosystem-condition / connectivity theme (S14_5), but WWF's connectivity input is the global functional-connectivity surface (Brennan, 2022), which Darwin does not yet hold globally. This layer is therefore a national extension rather than a WWF indicator.
Legend
Symbolised field: SRCE Water Stream - Class 1 category
| Class | Colour |
|---|---|
| Fonctional | #ff0000 |
| Natural | #2196f3 |
| Trame | #8bc34a |
Generated from darwin/layers/layer-linear-water-stream.toml and risk_indicator_pairs.toml (develop).