HydroBASINS lev08 watershed · #2080546910
Bassin de la Cance
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 4 administrative regions : Ardèche, Drôme, Haute-Loire, Loire
Sub-basin area
390,4km²
Upstream area
390,4km²
Discharge
4,32m³/s
Mean elev.
739m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 234.3 km²59.9% of basin
- 154.0 km²39.3% of basin
- 3.0 km²0.8% of basin
- 0.0 km²0.0% of basin
48 communes (GADM L5)Available for FRA, RWA
- Burdignes30.73 km²100% commune
- Saint-Sauveur-en-Rue30.18 km²100% commune
- Vanosc26.39 km²100% commune
- Saint-Julien-Vocance25.67 km²99% commune
- Annonay21.06 km²100% commune
- Bourg-Argental19.89 km²100% commune
- Roiffieux19.58 km²100% commune
- Colombier17.46 km²98% commune
- Vocance17.23 km²98% commune
- Saint-Marcel-lès-Annonay17.10 km²100% commune
- Vernosc-lès-Annonay15.60 km²92% commune
- La Versanne15.12 km²97% commune
- Thélis-la-Combe14.55 km²100% commune
- Saint-Alban-d'Ay14.03 km²60% commune
- Quintenas13.81 km²98% commune
- Savas10.95 km²87% commune
- Boulieu-lès-Annonay9.36 km²100% commune
- Villevocance9.22 km²100% commune
- Saint-Julien-Molin-Molette9.16 km²93% commune
- Graix8.56 km²97% commune
- Monestier7.46 km²100% commune
- Ardoix6.17 km²53% commune
- Saint-Clair5.41 km²96% commune
- Talencieux4.97 km²69% commune
- Davézieux3.59 km²58% commune
- Saint-Régis-du-Coin3.22 km²16% commune
- Véranne3.19 km²20% commune
- Saint-Romain-d'Ay3.02 km²31% commune
- Saint-Julien-Molhesabate1.38 km²5% commune
- Andance1.24 km²18% commune
- Sarras1.02 km²9% commune
- Riotord0.97 km²2% commune
- Saint-Pierre-sur-Doux0.90 km²4% commune
- Saint-Appolinard0.77 km²8% commune
- Saint-Bonnet-le-Froid0.63 km²5% commune
- Tarentaise0.44 km²4% commune
- Saint-Symphorien-de-Mahun0.34 km²2% commune
- Saint-Genest-Malifaux0.31 km²1% commune
- Le Bessat0.22 km²2% commune
- Saint-Cyr0.11 km²1% commune
- Doizieux0.10 km²0% commune
- Vinzieux0.06 km²1% commune
- La Valla-en-Gier0.04 km²0% commune
- Brossainc0.03 km²1% commune
- Saint-Jacques-d'Atticieux0.02 km²0% commune
- Thorrenc0.00 km²0% commune
- Laveyron0.00 km²0% commune
- Peaugres0.00 km²0% commune
6 intersecting protected areas
Pilat
IUCN VRegional Nature Park
153.99 km² overlap
Crêts du Pilat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.76 km² overlap
Affluents rive droite du Rhône
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.17 km² overlap
Tourbières du Pilat et landes de Chaussitre
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.50 km² overlap
Suc de Clava
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.13 km² overlap
Chaussitre Et Gimel
IUCN IVForest Managed Biological Reserve
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 587 distinct species · 149 325 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 19 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de la Cance : 16 espèces + 4 bulles famille, 45 interactions GloBI documentées sur 3 types (connectance 23.7%, filtre Serrano α=0.2). Les 4 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
8,9°C
Annual rain
884mm
Moisture idx (CMI)
0,05
Runoff
349mm/an
PET
833mm
AET
663mm
Mean slope
11,6°
Water table
479cm
Forest
57%
Crops
23%
Urban
6%
Protected
39%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)