HydroBASINS lev08 watershed · #2080536940
Bassin de Torrente Grauson
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 : Aosta, Torino
Sub-basin area
256km²
Upstream area
256km²
Discharge
7,36m³/s
Mean elev.
2 436m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- Aosta254.8 km²99.3% of basin
- 1.8 km²0.7% of basin
10 intersecting protected areas
Parco Nazionale del Gran Paradiso
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
159.29 km² overlap
Parco Nazionale del Gran Paradiso
IUCN Not ReportedSpecial Protection Area (Birds Directive)
159.29 km² overlap
National Park
159.29 km² overlap
Mont Avic e Mont Emilius
IUCN Not ReportedSpecial Protection Area (Birds Directive)
57.86 km² overlap
Vallone dell'Urtier
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
15.02 km² overlap
Vallone del Grauson
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.89 km² overlap
Pont D'ael
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.82 km² overlap
Stazione di Astragalus alopecurus di Cogne
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.36 km² overlap
Parco naturale Mont Avic
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.19 km² overlap
1 more protected areassorted by overlap area
Parco naturale del Mont Avic
IUCN IVRegional/Provincial Nature Park
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 999 distinct species · 42 330 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Torrente Grauson : 23 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 67 interactions GloBI sur 5 types (connectance 12.7%, filtre Serrano α=0.2). 10 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°
0,2°C
Annual rain
1 697mm
Moisture idx (CMI)
0,70
Runoff
853mm/an
PET
462mm
AET
457mm
Mean slope
27,6°
Water table
907cm
Forest
33%
Crops
2%
Urban
0%
Protected
62%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)