HydroBASINS lev08 watershed · #2080539080
Bassin du Gier
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 2 administrative regions : Loire, Rhône
Sub-basin area
425,1km²
Upstream area
425,1km²
Discharge
4,43m³/s
Mean elev.
549m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 319.9 km²75.1% of basin
- 106.2 km²24.9% of basin
52 communes (GADM L5)Available for FRA, RWA
- Saint-Chamond55.92 km²100% commune
- La Valla-en-Gier34.72 km²100% commune
- Doizieux27.42 km²98% commune
- Longes22.24 km²92% commune
- Saint-Paul-en-Jarez19.96 km²100% commune
- Échalas19.40 km²94% commune
- Saint-Romain-en-Jarez16.54 km²99% commune
- Saint-Étienne14.12 km²18% commune
- Châteauneuf13.89 km²100% commune
- Sainte-Croix-en-Jarez12.14 km²100% commune
- Cellieu12.07 km²100% commune
- Saint-Maurice-sur-Dargoire11.05 km²69% commune
- Givors10.89 km²61% commune
- Saint-Martin-la-Plaine9.75 km²100% commune
- Valfleury9.01 km²100% commune
- Saint-Didier-sous-Riverie8.95 km²61% commune
- La Terrasse-sur-Dorlay8.57 km²100% commune
- Genilac8.50 km²100% commune
- Pavezin8.25 km²97% commune
- Saint-Jean-Bonnefonds8.04 km²70% commune
- Saint-Joseph7.84 km²100% commune
- Trèves7.62 km²100% commune
- Rive-de-Gier7.45 km²100% commune
- Farnay7.16 km²100% commune
- Le Bessat7.08 km²73% commune
- Saint-Andéol-le-Château6.05 km²62% commune
- Saint-Christo-en-Jarez5.95 km²27% commune
- Saint-Jean-de-Touslas5.89 km²100% commune
- Sainte-Catherine4.96 km²37% commune
- Les Haies4.29 km²27% commune
- L'Horme4.18 km²100% commune
- La Grand-Croix4.15 km²100% commune
- Tartaras4.12 km²100% commune
- Saint-Romain-en-Gier3.91 km²100% commune
- Lorette3.53 km²100% commune
- Chagnon2.52 km²100% commune
- Sorbiers2.37 km²20% commune
- Dargoire1.69 km²100% commune
- La Chapelle-Villars1.06 km²13% commune
- Tarentaise0.74 km²6% commune
- Larajasse0.51 km²2% commune
- Graix0.31 km²3% commune
- Chuyer0.24 km²2% commune
- Chassagny0.23 km²3% commune
- Colombier0.19 km²1% commune
- Marcenod0.18 km²2% commune
- Riverie0.16 km²100% commune
- Pélussin0.13 km²0% commune
- Véranne0.08 km²1% commune
- Mornant0.06 km²0% commune
- Thélis-la-Combe0.01 km²0% commune
- Roisey0.00 km²0% commune
3 intersecting protected areas
Pilat
IUCN VRegional Nature Park
218.11 km² overlap
Vallée de l'Ondenon, contreforts nord du Pilat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.14 km² overlap
Crêts du Pilat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.33 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 386 distinct species · 166 157 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 du Gier : 32 espèces + 5 bulles famille, 85 interactions GloBI documentées sur 5 types (connectance 12.8%, filtre Serrano α=0.2). Les 5 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°
9,8°C
Annual rain
832mm
Moisture idx (CMI)
-0,04
Runoff
329mm/an
PET
864mm
AET
660mm
Mean slope
10,0°
Water table
426cm
Forest
38%
Crops
30%
Urban
20%
Protected
46%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)