HydroBASINS lev08 watershed · #2080563590
Bassin de la Tancanne
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 3 administrative regions : Lot, Lot-et-Garonne, Tarn-et-Garonne
Sub-basin area
245,8km²
Upstream area
245,8km²
Discharge
2,33m³/s
Mean elev.
178m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 190.5 km²77.4% of basin
- 37.6 km²15.3% of basin
- 18.1 km²7.4% of basin
33 communes (GADM L5)Available for FRA, RWA
- Penne-d'Agenais33.24 km²71% commune
- Tournon-d'Agenais21.39 km²100% commune
- Hautefage-la-Tour20.90 km²98% commune
- Valeilles13.71 km²100% commune
- Montaigu-de-Quercy12.94 km²17% commune
- Anthé12.76 km²89% commune
- Frespech12.60 km²100% commune
- Masquières10.87 km²97% commune
- Auradou10.69 km²100% commune
- Saint-Beauzeil9.27 km²96% commune
- Courbiac9.02 km²100% commune
- Monbalen8.46 km²65% commune
- Massoulès8.27 km²100% commune
- Saux8.22 km²100% commune
- Cassignas7.68 km²98% commune
- Sérignac7.05 km²37% commune
- Cazideroque6.26 km²51% commune
- Massels5.96 km²99% commune
- Dausse5.38 km²81% commune
- Saint-Antoine-de-Ficalba5.14 km²46% commune
- Bourlens4.87 km²31% commune
- Thézac2.31 km²20% commune
- Blaymont1.77 km²13% commune
- Cauzac1.65 km²11% commune
- Saint-Amans-du-Pech1.61 km²24% commune
- Saint-Matré1.43 km²23% commune
- Belmontet1.31 km²11% commune
- Laroque-Timbaut1.21 km²5% commune
- Roquecor0.10 km²0% commune
- Mauroux0.07 km²0% commune
- Trémons0.06 km²0% commune
- Valprionde0.05 km²0% commune
- Villeneuve-sur-Lot0.04 km²0% commune
7 intersecting protected areas
Coteaux du Boudouyssou et plateau de Lascrozes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.07 km² overlap
Le Boudouyssou
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.31 km² overlap
Land acquired by a regional conservatory of natural areas
0.45 km² overlap
pech de dosse
IUCN IVLand acquired by a regional conservatory of natural areas
0.06 km² overlap
Land acquired by a regional conservatory of natural areas
0.01 km² overlap
pech de penne-d\'agenais
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
coteau de castelmerle
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 139 distinct species · 22 551 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 la Tancanne : 30 espèces + 5 bulles famille, 77 interactions GloBI documentées sur 5 types (connectance 12.9%, 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°
12,2°C
Annual rain
800mm
Moisture idx (CMI)
-0,18
Runoff
299mm/an
PET
981mm
AET
666mm
Mean slope
5,3°
Water table
293cm
Forest
1%
Crops
85%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)