HydroBASINS lev08 watershed · #2080570050
Bassin de la Douze
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 : Gers, Landes
Sub-basin area
442,6km²
Upstream area
442,6km²
Discharge
5,44m³/s
Mean elev.
138m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 276.6 km²62.4% of basin
- 166.9 km²37.6% of basin
40 communes (GADM L5)Available for FRA, RWA
- Saint-Justin63.24 km²94% commune
- Cazaubon52.38 km²92% commune
- Manciet37.67 km²88% commune
- Labastide-d'Armagnac26.46 km²82% commune
- Lagrange17.60 km²83% commune
- Margouët-Meymes17.02 km²92% commune
- Espas14.33 km²93% commune
- Sarbazan14.10 km²63% commune
- Ayzieu13.86 km²100% commune
- Larée13.20 km²100% commune
- Saint-Julien-d'Armagnac12.35 km²84% commune
- Lupiac11.42 km²33% commune
- Mauléon-d'Armagnac10.79 km²31% commune
- Monclar9.76 km²100% commune
- Castelnavet8.73 km²48% commune
- Eauze8.68 km²12% commune
- Créon-d'Armagnac8.66 km²40% commune
- Séailles8.39 km²100% commune
- Réans8.17 km²69% commune
- Avéron-Bergelle8.11 km²55% commune
- Peyrusse-Grande7.53 km²29% commune
- Betbezer-d'Armagnac7.38 km²100% commune
- Parleboscq6.98 km²17% commune
- Bourrouillan6.91 km²80% commune
- Sainte-Christie-d'Armagnac6.16 km²26% commune
- Lias-d'Armagnac5.98 km²50% commune
- Campagne-d'Armagnac5.61 km²100% commune
- Mauvezin-d'Armagnac4.71 km²100% commune
- Estang4.69 km²20% commune
- Aignan3.18 km²10% commune
- Peyrusse-Vieille2.95 km²28% commune
- Marguestau2.88 km²100% commune
- Vielle-Soubiran2.86 km²9% commune
- Saint-Pierre-d'Aubézies2.74 km²33% commune
- Cravencères2.54 km²30% commune
- Dému1.79 km²6% commune
- Roquefort1.30 km²11% commune
- Saint-Gor1.24 km²2% commune
- Gazax-et-Baccarisse0.85 km²9% commune
- Panjas0.31 km²2% commune
3 intersecting protected areas
Étangs d'Armagnac
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.08 km² overlap
La Gélise
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.49 km² overlap
Réseau hydrographique des affluents de la Midouze
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 163 distinct species · 58 600 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 45 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 Douze : 42 espèces + 3 bulles famille, 105 interactions GloBI documentées sur 5 types (connectance 10.6%, filtre Serrano α=0.2). Les 3 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°
12,3°C
Annual rain
884mm
Moisture idx (CMI)
-0,11
Runoff
388mm/an
PET
991mm
AET
696mm
Mean slope
2,2°
Water table
137cm
Forest
34%
Crops
39%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)