HydroBASINS lev08 watershed · #2080552820
Bassin de l'Allier
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 : Haute-Loire, Lozère
Sub-basin area
153,6km²
Upstream area
1 054,3km²
Discharge
15,28m³/s
Mean elev.
996m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Allier517 km²
- Bassin du Chapeauroux384 km²
2 dept-equivalent regions (GADM L2)
- 153.9 km²100.0% of basin
- 0.0 km²0.0% of basin
18 communes (GADM L5)Available for FRA, RWA
- Saint-Jean-Lachalm33.32 km²95% commune
- Alleyras22.88 km²92% commune
- Saint-Privat-d'Allier21.64 km²71% commune
- Saint-Haon16.14 km²41% commune
- Ouides10.81 km²100% commune
- Monistrol-d'Allier10.41 km²38% commune
- Saint-Christophe-d'Allier9.47 km²49% commune
- Le Bouchet-Saint-Nicolas8.25 km²44% commune
- Saint-Didier-d'Allier7.53 km²100% commune
- Saint-Vénérand5.85 km²60% commune
- Saint-Préjet-d'Allier4.59 km²19% commune
- Vergezac0.82 km²4% commune
- Saint-Jean-de-Nay0.74 km²3% commune
- Cayres0.50 km²2% commune
- Bains0.48 km²1% commune
- Le Vernet0.35 km²10% commune
- Séneujols0.16 km²1% commune
- Saint-Bonnet-de-Montauroux0.03 km²0% commune
2 intersecting protected areas
Haut Val d'Allier
IUCN Not ReportedSpecial Protection Area (Birds Directive)
96.28 km² overlap
Gorges de l'Allier et affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
67.38 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 267 distinct species · 44 869 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 29 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 l'Allier : 21 espèces reliées par 71 interactions GloBI sur 5 types (connectance 17.5%, filtre Serrano α=0.2). 8 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
7,9°C
Annual rain
754mm
Moisture idx (CMI)
-0,06
Runoff
401mm/an
PET
804mm
AET
611mm
Mean slope
10,5°
Water table
502cm
Forest
81%
Crops
25%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)