HydroBASINS lev08 watershed · #2080555420
Bassin de l'Alzou
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
Sub-basin area
340,7km²
Upstream area
340,8km²
Discharge
4,76m³/s
Mean elev.
332m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
35 communes (GADM L5)Available for FRA, RWA
- Gramat57.40 km²100% commune
- Rocamadour32.75 km²66% commune
- Carlucet27.58 km²80% commune
- Le Bastit25.67 km²92% commune
- Aynac21.31 km²98% commune
- Couzou21.02 km²100% commune
- Issendolus18.93 km²100% commune
- Mayrinhac-Lentour13.46 km²86% commune
- Thémines12.55 km²90% commune
- Calès12.42 km²37% commune
- Thégra11.68 km²91% commune
- Bio10.64 km²100% commune
- Rignac9.58 km²97% commune
- Rueyres9.24 km²100% commune
- Lavergne8.62 km²100% commune
- Anglars7.75 km²79% commune
- Lacave6.24 km²28% commune
- Reilhac5.02 km²40% commune
- Leyme3.92 km²38% commune
- Flaujac-Gare3.85 km²48% commune
- Albiac3.78 km²100% commune
- Espeyroux3.65 km²46% commune
- Saignes3.37 km²100% commune
- Rudelle2.23 km²31% commune
- Lunegarde2.17 km²21% commune
- Padirac1.94 km²23% commune
- Saint-Jean-Lagineste1.75 km²14% commune
- Loubressac1.20 km²5% commune
- Théminettes0.81 km²10% commune
- Alvignac0.56 km²4% commune
- Bannes0.11 km²1% commune
- Montfaucon0.08 km²0% commune
- Saint-Vincent-du-Pendit0.07 km²1% commune
- Lacapelle-Marival0.05 km²0% commune
- Fontanes-du-Causse0.00 km²0% commune
9 intersecting protected areas
Causses Du Quercy
IUCN VRegional Nature Park
286.63 km² overlap
Vallées de l'Ouysse et de l'Alzou
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
30.03 km² overlap
Zone centrale du causse de Gramat
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.28 km² overlap
Secteur de Lacérède
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.76 km² overlap
Marais De Bonnefont
IUCN IVRegional Nature Reserve
0.42 km² overlap
Vieux chênes de la Panonnie
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.28 km² overlap
Vallée de la Dordogne quercynoise
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Vieux chênes de Cantegrel
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.11 km² overlap
Falaises lotoises (Rapaces)
IUCN IVBiotope Protection Order
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 839 distinct species · 99 166 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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'Alzou : 21 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 101 interactions GloBI sur 5 types (connectance 18.0%, filtre Serrano α=0.2). 13 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°
11,8°C
Annual rain
828mm
Moisture idx (CMI)
-0,15
Runoff
443mm/an
PET
972mm
AET
678mm
Mean slope
4,5°
Water table
219cm
Forest
12%
Crops
15%
Urban
0%
Protected
84%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)