HydroBASINS lev08 watershed · #2080460950
Bassin de la Drouette
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-et-Loir, Yvelines
Sub-basin area
687,1km²
Upstream area
2 090,9km²
Discharge
15,15m³/s
Mean elev.
149m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de l'Eure948 km²
- Bassin de la Voise456 km²
2 dept-equivalent regions (GADM L2)
- 479.8 km²69.6% of basin
- 209.4 km²30.4% of basin
81 communes (GADM L5)Available for FRA, RWA
- Rambouillet32.99 km²91% commune
- Berchères-Saint-Germain27.65 km²96% commune
- Gazeran25.89 km²100% commune
- Tremblay-les-Villages24.97 km²40% commune
- Poigny-la-Forêt22.92 km²97% commune
- La Boissière-École22.87 km²88% commune
- Néron19.19 km²100% commune
- Hermeray19.02 km²100% commune
- Villemeux-sur-Eure18.88 km²100% commune
- Serazereux16.09 km²100% commune
- Orphin14.78 km²90% commune
- Hanches14.17 km²85% commune
- Saint-Hilarion14.08 km²100% commune
- Clévilliers13.87 km²90% commune
- Bouglainval13.62 km²94% commune
- Nogent-le-Roi13.21 km²100% commune
- Ouerre12.98 km²100% commune
- Le Boullay-Thierry12.89 km²100% commune
- Coulombs12.63 km²100% commune
- Cherisy12.22 km²97% commune
- Émancé12.15 km²99% commune
- Saint-Martin-de-Nigelles11.94 km²100% commune
- Chaudon11.74 km²100% commune
- Maintenon11.12 km²97% commune
- Vérigny10.98 km²84% commune
- Villiers-le-Morhier10.77 km²100% commune
- Pierres10.48 km²100% commune
- Marville-Moutiers-Brûlé10.26 km²49% commune
- Mittainville10.21 km²100% commune
- Raizeux9.99 km²100% commune
- Orcemont9.95 km²93% commune
- Faverolles9.90 km²100% commune
- Challet9.83 km²100% commune
- Abondant9.48 km²27% commune
- Saint-Lucien9.46 km²100% commune
- Ormoy9.44 km²100% commune
- Boutigny-Prouais9.04 km²27% commune
- Germainville8.77 km²100% commune
- Le Boullay-Mivoye8.63 km²79% commune
- Mézières-en-Drouais8.38 km²100% commune
- Poisvilliers8.05 km²74% commune
- Senantes7.60 km²100% commune
- Charpont7.23 km²100% commune
- Saint-Laurent-la-Gâtine7.12 km²100% commune
- Épernon6.51 km²93% commune
- Broué5.84 km²47% commune
- Bréchamps5.66 km²100% commune
- Sonchamp5.65 km²12% commune
- La Chapelle-Forainvilliers5.51 km²100% commune
- Sainte-Gemme-Moronval5.42 km²97% commune
- Croisilles5.34 km²100% commune
- Briconville5.21 km²81% commune
- Droue-sur-Drouette5.19 km²100% commune
- Fresnay-le-Gilmert4.74 km²85% commune
- Luray3.99 km²88% commune
- Saint-Léger-en-Yvelines3.47 km²10% commune
- Écluzelles3.26 km²100% commune
- Garnay2.97 km²21% commune
- Les Pinthières2.76 km²70% commune
- Thimert-Gâtelles2.49 km²6% commune
- Saint-Piat2.23 km²20% commune
- Serville2.09 km²38% commune
- Dangers1.86 km²25% commune
- Vieille-Église-en-Yvelines1.76 km²18% commune
- Écrosnes1.74 km²7% commune
- Lormaye1.33 km²100% commune
- Le Perray-en-Yvelines1.21 km²9% commune
- Chartainvilliers1.18 km²13% commune
- Le Tartre-Gaudran0.86 km²19% commune
- Prunay-en-Yvelines0.63 km²2% commune
- Bailleau-l'Évêque0.61 km²3% commune
- Vernouillet0.49 km²4% commune
- La Hauteville0.47 km²10% commune
- Les Bréviaires0.44 km²2% commune
- Dreux0.40 km²2% commune
- Saint-Prest0.27 km²2% commune
- Houx0.06 km²1% commune
- Gas0.05 km²0% commune
- Clairefontaine-en-Yvelines0.03 km²0% commune
- Bû0.01 km²0% commune
- Adainville0.01 km²0% commune
19 intersecting protected areas
Regional Nature Park
79.96 km² overlap
Massif de Rambouillet et zones humides proches
IUCN Not ReportedSpecial Protection Area (Birds Directive)
58.65 km² overlap
Forêt de Rambouillet
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.80 km² overlap
Vallée de l'Eure de Maintenon à Anet et vallons affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.79 km² overlap
Marais Du Cerisaie
IUCN IVForest Managed Biological Reserve
0.88 km² overlap
Petit Etang Neuf
IUCN IVForest Managed Biological Reserve
0.19 km² overlap
cote du bois de ruffin (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.09 km² overlap
cote de la noe robert (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.06 km² overlap
Mare Aux Canettes
IUCN IVForest Managed Biological Reserve
0.05 km² overlap
10 more protected areassorted by overlap area
Etang Du Roi
IUCN IVForest Managed Biological Reserve
0.04 km² overlap
cotes des heros (les)
IUCN IVLand acquired by a regional conservatory of natural areas
0.04 km² overlap
cotes des vaux piras (les)
IUCN IVLand acquired by a regional conservatory of natural areas
0.03 km² overlap
cotes au prieur (les)
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Mares De Pecqueuse
IUCN IVForest Managed Biological Reserve
0.02 km² overlap
Biotope Protection Order
0.01 km² overlap
larris (les)
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
cote de la floqueterie (la)
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
jardin d\'amour
IUCN IVLand acquired by a regional conservatory of natural areas
0.00 km² overlap
Mare Aux Buttes
IUCN IVForest Managed Biological Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 030 distinct species · 485 715 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Drouette : 26 espèces reliées par 122 interactions GloBI sur 6 types (connectance 17.4%, filtre Serrano α=0.2). 12 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°
10,3°C
Annual rain
634mm
Moisture idx (CMI)
-0,21
Runoff
236mm/an
PET
798mm
AET
534mm
Mean slope
1,3°
Water table
121cm
Forest
9%
Crops
51%
Urban
8%
Protected
12%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)