HydroBASINS lev08 watershed · #2080455690
Bassin de la Mauldre
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 : Hauts-de-Seine, Yvelines
Sub-basin area
404,8km²
Upstream area
404,8km²
Discharge
2,59m³/s
Mean elev.
127m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- 405.7 km²99.9% of basin
- 0.3 km²0.1% of basin
81 communes (GADM L5)Available for FRA, RWA
- Beynes18.80 km²99% commune
- Plaisir17.80 km²100% commune
- Versailles17.70 km²69% commune
- Crespières14.59 km²96% commune
- Maule13.89 km²80% commune
- Grosrouvre11.92 km²94% commune
- Thiverval-Grignon11.16 km²100% commune
- Villepreux10.77 km²100% commune
- Méré10.76 km²100% commune
- Saint-Rémy-l'Honoré10.35 km²100% commune
- Saint-Nom-la-Bretèche10.29 km²90% commune
- Garancières10.00 km²98% commune
- Jouars-Pontchartrain9.95 km²100% commune
- Feucherolles9.24 km²69% commune
- Élancourt8.59 km²91% commune
- Maurepas8.00 km²98% commune
- Neauphle-le-Vieux7.21 km²100% commune
- Villiers-le-Mahieu6.91 km²100% commune
- Les Mesnuls6.59 km²100% commune
- Épône6.41 km²47% commune
- Herbeville6.31 km²100% commune
- Bazemont6.23 km²94% commune
- Chavenay6.20 km²100% commune
- Bailly6.20 km²94% commune
- Les Clayes-sous-Bois6.14 km²100% commune
- Le Tremblay-sur-Mauldre5.94 km²100% commune
- Bazoches-sur-Guyonne5.89 km²100% commune
- Davron5.85 km²100% commune
- La Queue-les-Yvelines5.83 km²100% commune
- Noisy-le-Roi5.72 km²98% commune
- Montfort-l'Amaury5.63 km²100% commune
- Saint-Léger-en-Yvelines5.56 km²16% commune
- Saint-Cyr-l'École5.45 km²99% commune
- Fontenay-le-Fleury5.44 km²100% commune
- Villiers-Saint-Fréderic5.34 km²100% commune
- Saint-Germain-de-la-Grange5.28 km²100% commune
- Autouillet4.97 km²100% commune
- Les Essarts-le-Roi4.94 km²25% commune
- Vicq4.94 km²100% commune
- Trappes4.60 km²33% commune
- Galluis4.56 km²100% commune
- Mareil-sur-Mauldre4.30 km²100% commune
- Millemont4.25 km²74% commune
- Auteuil4.20 km²100% commune
- Montainville4.19 km²91% commune
- Le Chesnay4.11 km²93% commune
- Les Bréviaires4.03 km²20% commune
- Boissy-sans-Avoir4.03 km²100% commune
- Mareil-le-Guyon3.88 km²100% commune
- Les Alluets-le-Roi3.42 km²45% commune
- Coignières3.17 km²39% commune
- La Falaise2.89 km²100% commune
- Rocquencourt2.73 km²100% commune
- Bois-d'Arcy2.55 km²46% commune
- Saulx-Marchais2.30 km²100% commune
- Aulnay-sur-Mauldre2.25 km²100% commune
- Neauphle-le-Château2.23 km²100% commune
- Aubergenville2.03 km²22% commune
- Rennemoulin1.95 km²100% commune
- Flexanville1.30 km²14% commune
- Nézel1.17 km²100% commune
- Béhoust1.00 km²18% commune
- Thoiry0.98 km²13% commune
- Gambaiseuil0.96 km²5% commune
- Marcq0.77 km²16% commune
- La Verrière0.64 km²34% commune
- Louveciennes0.46 km²8% commune
- La Celle-Saint-Cloud0.44 km²7% commune
- Goupillières0.41 km²7% commune
- Montigny-le-Bretonneux0.31 km²3% commune
- Andelu0.28 km²7% commune
- Vaucresson0.25 km²8% commune
- Gambais0.15 km²1% commune
- Guyancourt0.12 km²1% commune
- Marly-le-Roi0.10 km²1% commune
- Marnes-la-Coquette0.08 km²2% commune
- Flins-sur-Seine0.07 km²1% commune
- Le Mesnil-Saint-Denis0.05 km²1% commune
- L'Étang-la-Ville0.04 km²1% commune
- Bouafle0.02 km²0% commune
- Ecquevilly0.00 km²0% commune
9 intersecting protected areas
Regional Nature Park
96.70 km² overlap
Massif de Rambouillet et zones humides proches
IUCN Not ReportedSpecial Protection Area (Birds Directive)
10.57 km² overlap
Domaine De Grignon À Thiverval-Grignon
IUCN Not ReportedGeotope Protection Order
0.34 km² overlap
Geotope Protection Order
0.34 km² overlap
Le Bout Du Monde
IUCN IVBiotope Protection Order
0.23 km² overlap
La Ferme De L\'Orme
IUCN IVGeotope Protection Order
0.09 km² overlap
La Ferme De L\'Orme
IUCN Not ReportedGeotope Protection Order
0.09 km² overlap
Mares Moussues
IUCN IVForest Managed Biological Reserve
0.01 km² overlap
Etangs et rigoles d’Yveline
IUCN IVNational Nature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 898 distinct species · 404 867 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Mauldre : 20 espèces reliées par 105 interactions GloBI sur 6 types (connectance 19.9%, filtre Serrano α=0.2). 13 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
638mm
Moisture idx (CMI)
-0,20
Runoff
203mm/an
PET
794mm
AET
536mm
Mean slope
2,4°
Water table
218cm
Forest
6%
Crops
41%
Urban
42%
Protected
24%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)