Surface Water Stream
This layer maps the surface water component of France's Green and Blue Network (Trame Verte et Bleue) — the areal aquatic continuities, such as watercourses and associat…
Category: Transition risks · Sensitive areas · Critical areas · SRCE (France) Coverage: Region (France) Format: Boundary polygons Used in risk analysis: No (contextual layer; not used in materiality scoring)
What it shows
This layer maps the surface water component of France's Green and Blue Network (Trame Verte et Bleue) — the areal aquatic continuities, such as watercourses and associated wetlands, that form the "blue" part of regional ecological connectivity. They matter for nature-related risk because development affecting these aquatic continuities can disrupt freshwater habitat connectivity and is subject to French planning scrutiny.
How it is built
The Green and Blue Network is a French biodiversity-preservation framework that integrates the maintenance and strengthening of functional natural environments into planning and development projects (Allag-Dhuisme et al., 2010). It is delineated at the regional level through the Regional Ecological Coherence Schemes (SRCE). The ecological continuities it defines comprise biodiversity reservoirs and ecological corridors; this layer represents the surface water-stream (areal aquatic) component, mapped as boundaries identified by regional authorities.
How to read it
This is a boundary layer. A site that intersects or lies close to a mapped surface water stream is flagged as potentially affecting regional aquatic ecological continuity, warranting closer review. There is no numeric score — relevance is determined by spatial overlap or proximity.
Source
Regional Ecological Coherence Schemes (SRCE), France — Trame Verte et Bleue (Allag-Dhuisme et al., 2010).
Comparison with the WWF Risk Filter Suite
There is no equivalent indicator in the WWF Risk Filter Suite. The SRCE aquatic continuities loosely support the theme of ecological connectivity, but they are a regional French dataset. WWF's connectivity input is the global Brennan (2022) functional-connectivity surface, which Darwin does not yet hold globally, so this layer is a regional extension rather than a WWF-comparable indicator.
Legend
Symbolised field: SRCE Water Stream - Class 1 category
| Class | Colour |
|---|---|
| Fonctional | #ff0000 |
| Natural | #2196f3 |
| Trame | #8bc34a |
Generated from darwin/layers/layer-surface-water-stream.toml and risk_indicator_pairs.toml (develop).