HydroBASINS lev08 watershed · #2080530740
Bassin de la Cozance
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 : Ain
Sub-basin area
85,4km²
Upstream area
3 097,9km²
Discharge
105,03m³/s
Mean elev.
298m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin du Suran367 km²
- Bassin de l'Ain239 km²
1 dept-equivalent regions (GADM L2)
- 85.6 km²100.0% of basin
13 communes (GADM L5)Available for FRA, RWA
- Ambronay28.47 km²86% commune
- Ambérieu-en-Bugey12.67 km²50% commune
- Villette-sur-Ain11.53 km²58% commune
- Priay11.15 km²71% commune
- Château-Gaillard9.77 km²62% commune
- Douvres5.20 km²100% commune
- Varambon3.45 km²43% commune
- Saint-Jean-le-Vieux1.08 km²7% commune
- Saint-Rambert-en-Bugey0.87 km²3% commune
- Saint-Maurice-de-Rémens0.68 km²6% commune
- Châtillon-la-Palud0.62 km²4% commune
- Pont-d'Ain0.15 km²1% commune
- Druillat0.02 km²0% commune
7 intersecting protected areas
Basse vallée de l'Ain, confluence Ain-Rhône
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.37 km² overlap
La Dombes
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.28 km² overlap
La Dombes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.28 km² overlap
La Dombes
IUCN Not ReportedWetland of International Importance (Ramsar Site)
1.28 km² overlap
Land acquired by a regional conservatory of natural areas
0.50 km² overlap
Les Brotteaux
IUCN IVBiotope Protection Order
0.15 km² overlap
Land acquired by a regional conservatory of natural areas
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 147 distinct species · 34 639 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Cozance : 37 espèces + 6 bulles famille, 98 interactions GloBI documentées sur 5 types (connectance 10.9%, filtre Serrano α=0.2). Les 6 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°
10,8°C
Annual rain
880mm
Moisture idx (CMI)
-0,02
Runoff
626mm/an
PET
894mm
AET
674mm
Mean slope
3,0°
Water table
124cm
Forest
48%
Crops
23%
Urban
11%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)