HydroBASINS lev08 watershed · #2080568850
Bassin de l'Aveyron
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 : Tarn, Tarn-et-Garonne
Sub-basin area
227,4km²
Upstream area
4 589,7km²
Discharge
52,27m³/s
Mean elev.
150m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Aveyron392 km²
- Bassin de la Vère325 km²
2 dept-equivalent regions (GADM L2)
- 215.0 km²94.4% of basin
- 12.8 km²5.6% of basin
18 communes (GADM L5)Available for FRA, RWA
- Nègrepelisse48.03 km²99% commune
- Vaïssac30.50 km²81% commune
- Montricoux26.66 km²100% commune
- Bioule20.16 km²100% commune
- Bruniquel20.00 km²59% commune
- Puygaillard-de-Quercy17.50 km²100% commune
- Albias14.31 km²65% commune
- Penne11.96 km²19% commune
- Saint-Cirq9.54 km²59% commune
- Cazals6.48 km²57% commune
- Cayrac5.59 km²89% commune
- Caussade5.11 km²11% commune
- Saint-Étienne-de-Tulmont3.88 km²18% commune
- Réalville3.40 km²13% commune
- Monclar-de-Quercy3.03 km²8% commune
- Saint-Antonin-Noble-Val0.84 km²1% commune
- Larroque0.75 km²4% commune
- Puycelci0.11 km²0% commune
7 intersecting protected areas
Forêt de Grésigne et environs
IUCN Not ReportedSpecial Protection Area (Birds Directive)
18.77 km² overlap
Gorges de l'Aveyron, causses proches et vallée de la Vère
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
18.63 km² overlap
Le Gouyre
IUCN IVBiotope Protection Order
2.11 km² overlap
Vallées du Tarn, de l'Aveyron, du Viaur, de l'Agout et du Gijou
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.54 km² overlap
Biotope Protection Order
0.96 km² overlap
grotte de senchet
IUCN IVLand acquired by a regional conservatory of natural areas
0.18 km² overlap
Parois De Bruniquel
IUCN IVBiotope Protection Order
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 565 distinct species · 27 145 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 44 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'Aveyron : 40 espèces + 4 bulles famille, 94 interactions GloBI documentées sur 5 types (connectance 9.9%, filtre Serrano α=0.2). Les 4 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°
12,8°C
Annual rain
745mm
Moisture idx (CMI)
-0,25
Runoff
267mm/an
PET
996mm
AET
629mm
Mean slope
2,3°
Water table
153cm
Forest
15%
Crops
60%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)