HydroBASINS lev08 watershed · #2080461070
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 1 administrative regions : Eure-et-Loir
Sub-basin area
464km²
Upstream area
464km²
Discharge
4,46m³/s
Mean elev.
187m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
1 dept-equivalent regions (GADM L2)
- 465.5 km²100.0% of basin
41 communes (GADM L5)Available for FRA, RWA
- Senonches44.72 km²70% commune
- Maillebois41.77 km²100% commune
- Tremblay-les-Villages38.22 km²60% commune
- Thimert-Gâtelles36.97 km²85% commune
- Saint-Maixme-Hauterive31.89 km²100% commune
- Digny30.00 km²73% commune
- Saint-Sauveur-Marville18.62 km²100% commune
- Saint-Ange-et-Torçay15.97 km²97% commune
- Le Mesnil-Thomas15.74 km²100% commune
- Jaudrais15.69 km²100% commune
- Le Boullay-les-Deux-Églises13.92 km²100% commune
- Crucey-Villages13.66 km²31% commune
- Louvilliers-lès-Perche12.56 km²84% commune
- Dreux12.19 km²51% commune
- Garnay11.49 km²79% commune
- Saint-Jean-de-Rebervilliers11.09 km²100% commune
- Tréon11.04 km²100% commune
- Vernouillet10.96 km²89% commune
- Marville-Moutiers-Brûlé10.62 km²51% commune
- Ardelles9.10 km²89% commune
- Aunay-sous-Crécy8.45 km²100% commune
- Saulnières8.36 km²82% commune
- Crécy-Couvé6.78 km²100% commune
- Fontaine-les-Ribouts6.34 km²89% commune
- Puiseux5.26 km²100% commune
- Châteauneuf-en-Thymerais3.95 km²100% commune
- Favières3.40 km²27% commune
- La Framboisière3.24 km²67% commune
- Garancières-en-Drouais3.16 km²50% commune
- Le Boullay-Mivoye2.27 km²21% commune
- Allainville1.93 km²35% commune
- Clévilliers1.56 km²10% commune
- Pontgouin1.10 km²4% commune
- Saint-Maurice-Saint-Germain0.94 km²8% commune
- Laons0.65 km²4% commune
- Luray0.53 km²12% commune
- Châtaincourt0.49 km²3% commune
- Montreuil0.47 km²7% commune
- Sainte-Gemme-Moronval0.16 km²3% commune
- Cherisy0.15 km²1% commune
- La Saucelle0.05 km²0% commune
5 intersecting protected areas
Forêts et étangs du Perche
IUCN Not ReportedSpecial Protection Area (Birds Directive)
59.81 km² overlap
Perche
IUCN VRegional Nature Park
45.21 km² overlap
Arc forestier du Perche d'Eure-et-Loir
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.50 km² overlap
Vallée de l'Eure de Maintenon à Anet et vallons affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.35 km² overlap
etang de l\'isle (l\')
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 856 distinct species · 90 160 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 27 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 : 24 espèces reliées par 66 interactions GloBI sur 5 types (connectance 18.8%, filtre Serrano α=0.2). 3 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°
10,0°C
Annual rain
651mm
Moisture idx (CMI)
-0,18
Runoff
303mm/an
PET
792mm
AET
541mm
Mean slope
1,1°
Water table
73cm
Forest
1%
Crops
57%
Urban
5%
Protected
10%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)