HydroBASINS lev08 watershed · #2080564730
Bassin de Ruisseau de Bénac
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 : Lot-et-Garonne
Sub-basin area
74,9km²
Upstream area
37 926,8km²
Discharge
422,65m³/s
Mean elev.
82m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Baïse2882 km²
- Bassin de l'Auvignon777 km²
1 dept-equivalent regions (GADM L2)
- 75.1 km²100.0% of basin
15 communes (GADM L5)Available for FRA, RWA
- Buzet-sur-Baïse18.26 km²86% commune
- Ambrus11.02 km²90% commune
- Damazan9.11 km²56% commune
- Saint-Pierre-de-Buzet8.47 km²100% commune
- Aiguillon7.74 km²28% commune
- Saint-Léger4.90 km²81% commune
- Xaintrailles4.71 km²45% commune
- Port-Sainte-Marie4.01 km²21% commune
- Thouars-sur-Garonne3.25 km²89% commune
- Caubeyres1.89 km²13% commune
- Monheurt0.77 km²7% commune
- Feugarolles0.42 km²2% commune
- Saint-Léon0.32 km²3% commune
- Mongaillard0.15 km²2% commune
- Pompiey0.06 km²0% commune
3 intersecting protected areas
La Garonne en Nouvelle-Aquitaine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.73 km² overlap
Garonne Et Section Du Lot
IUCN IVBiotope Protection Order
1.36 km² overlap
Biotope Protection Order
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 914 distinct species · 45 571 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 49 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 Ruisseau de Bénac : 40 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 116 interactions GloBI sur 5 types (connectance 9.9%, filtre Serrano α=0.2). 9 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°
12,5°C
Annual rain
816mm
Moisture idx (CMI)
-0,18
Runoff
286mm/an
PET
994mm
AET
670mm
Mean slope
2,6°
Water table
187cm
Forest
25%
Crops
87%
Urban
0%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)