HydroBASINS lev08 watershed · #2080549760
Bassin du Drac
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 1 administrative regions : Isère
Sub-basin area
141,2km²
Upstream area
2 078km²
Discharge
34,85m³/s
Mean elev.
804m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Ébron358 km²
- Bassin de la Jonche90 km²
1 dept-equivalent regions (GADM L2)
- 141.6 km²100.0% of basin
23 communes (GADM L5)Available for FRA, RWA
- La Motte-Saint-Martin14.39 km²100% commune
- Saint-Georges-de-Commiers13.93 km²100% commune
- Marcieu13.09 km²100% commune
- Vif13.08 km²47% commune
- Treffort11.81 km²92% commune
- Monteynard11.65 km²100% commune
- La Motte-d'Aveillans10.13 km²99% commune
- Avignonet8.12 km²94% commune
- Notre-Dame-de-Vaulx8.11 km²100% commune
- Saint-Martin-de-la-Cluze8.05 km²49% commune
- Sinard7.93 km²70% commune
- Saint-Jean-de-Vaulx6.27 km²58% commune
- Notre-Dame-de-Commiers5.58 km²100% commune
- Champ-sur-Drac3.21 km²38% commune
- Mayres-Savel2.81 km²20% commune
- Varces-Allières-et-Risset2.66 km²13% commune
- Pierre-Châtel0.26 km²2% commune
- Roissard0.15 km²1% commune
- Susville0.13 km²1% commune
- Monestier-de-Clermont0.11 km²2% commune
- Saint-Théoffrey0.08 km²1% commune
- Prunières0.01 km²0% commune
- Lavars0.00 km²0% commune
1 intersecting protected areas
Isles Du Drac
IUCN IVRegional Nature Reserve
5.44 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 044 distinct species · 175 816 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 12 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 Drac : 11 espèces + 1 bulle famille, 20 interactions GloBI documentées sur 3 types (connectance 30.3%, filtre Serrano α=0.2). Les 1 bulle regroupe 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°
8,6°C
Annual rain
989mm
Moisture idx (CMI)
0,12
Runoff
501mm/an
PET
854mm
AET
677mm
Mean slope
17,5°
Water table
605cm
Forest
89%
Crops
2%
Urban
6%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)