HydroBASINS lev08 watershed · #2080460600
Bassin de la Blaise
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 : Eure, Eure-et-Loir
Sub-basin area
7,5km²
Upstream area
2 562,3km²
Discharge
19,69m³/s
Mean elev.
108m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de la Drouette687 km²
- Bassin de la Blaise464 km²
2 dept-equivalent regions (GADM L2)
- 7.5 km²99.6% of basin
- 0.0 km²0.4% of basin
5 communes (GADM L5)Available for FRA, RWA
- Montreuil4.75 km²73% commune
- Abondant1.34 km²4% commune
- Dreux1.14 km²5% commune
- Cherisy0.25 km²2% commune
- Saint-Georges-Motel0.03 km²1% commune
2 intersecting protected areas
Vallée de l'Eure de Maintenon à Anet et vallons affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.39 km² overlap
cote de montreuil (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 419 distinct species · 24 625 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 22 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 Blaise : 14 espèces reliées par 59 interactions GloBI sur 5 types (connectance 19.7%, filtre Serrano α=0.2). 11 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°
10,4°C
Annual rain
615mm
Moisture idx (CMI)
-0,23
Runoff
306mm/an
PET
794mm
AET
519mm
Mean slope
2,8°
Water table
221cm
Forest
21%
Crops
30%
Urban
5%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)