HydroBASINS lev08 watershed · #2080586670
Bassin de l'Ourse
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-Garonne, Hautes-Pyrénées
Sub-basin area
134,9km²
Upstream area
135km²
Discharge
2,03m³/s
Mean elev.
1 160m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 135.0 km²99.9% of basin
- 0.2 km²0.1% of basin
34 communes (GADM L5)Available for FRA, RWA
- Ferrère56.81 km²97% commune
- Sost31.24 km²96% commune
- Esbareich8.90 km²95% commune
- Ourde5.35 km²98% commune
- Sacoué4.49 km²34% commune
- Mauléon-Barousse3.84 km²70% commune
- Bramevaque3.56 km²100% commune
- Anla2.99 km²98% commune
- Troubat2.70 km²100% commune
- Samuran2.18 km²81% commune
- Aveux2.06 km²73% commune
- Izaourt1.95 km²76% commune
- Ilheu1.37 km²72% commune
- Gembrie1.26 km²100% commune
- Sarp1.24 km²70% commune
- Gaudent1.16 km²95% commune
- Créchets1.14 km²100% commune
- Antichan1.00 km²100% commune
- Sarrancolin0.58 km²2% commune
- Thèbe0.39 km²5% commune
- Cazarilh0.38 km²12% commune
- Jézeau0.21 km²2% commune
- Loures-Barousse0.10 km²4% commune
- Guran0.05 km²1% commune
- Nistos0.03 km²0% commune
- Bachos0.03 km²1% commune
- Cirès0.02 km²0% commune
- Bareilles0.02 km²0% commune
- Cierp-Gaud0.02 km²0% commune
- Bourg-d'Oueil0.02 km²0% commune
- Bertren0.02 km²1% commune
- Caubous0.01 km²0% commune
- Saint-Bertrand-de-Comminges0.01 km²0% commune
- Ardengost0.01 km²0% commune
1 intersecting protected areas
Zones rupestres xérothermiques du bassin de Marignac, Saint-Béat, pic du Gar, montagne de Rié
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 527 distinct species · 26 872 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 27 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'Ourse : 22 espèces + 5 bulles famille, 52 interactions GloBI documentées sur 3 types (connectance 14.8%, 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°
7,8°C
Annual rain
1 060mm
Moisture idx (CMI)
0,24
Runoff
435mm/an
PET
791mm
AET
694mm
Mean slope
21,5°
Water table
698cm
Forest
89%
Crops
2%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)