HydroBASINS lev08 watershed · #2080453240
Bassin de l'Epte
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 5 administrative regions : Eure, Oise, Seine-Maritime, Val-d'Oise, Yvelines
Sub-basin area
1 480km²
Upstream area
1 480,1km²
Discharge
15,51m³/s
Mean elev.
128m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 571.5 km²38.5% of basin
- 447.8 km²30.2% of basin
- 294.8 km²19.9% of basin
- 160.8 km²10.8% of basin
- 9.9 km²0.7% of basin
214 communes (GADM L5)Available for FRA, RWA
- Sérifontaine21.09 km²100% commune
- Étrépagny20.34 km²100% commune
- Saint-Germer-de-Fly18.66 km²95% commune
- Chaumont-en-Vexin18.52 km²100% commune
- Flavacourt18.28 km²100% commune
- Neuf-Marché17.97 km²100% commune
- Saint-Denis-le-Ferment17.33 km²100% commune
- Brémontier-Merval17.07 km²100% commune
- Beauvoir-en-Lyons17.04 km²50% commune
- Gisors17.03 km²100% commune
- Bézancourt17.01 km²97% commune
- Montjavoult16.73 km²100% commune
- Morgny16.19 km²94% commune
- Saumont-la-Poterie16.05 km²100% commune
- Longchamps15.69 km²100% commune
- Ferrières-en-Bray15.34 km²100% commune
- Écos15.03 km²100% commune
- Labosse14.85 km²100% commune
- Magny-en-Vexin14.65 km²100% commune
- Chaussy14.60 km²99% commune
- Saint-Crépin-Ibouvillers14.09 km²96% commune
- Saint-Gervais13.78 km²100% commune
- Nojeon-en-Vexin13.03 km²100% commune
- Jouy-sous-Thelle13.02 km²100% commune
- Gasny12.91 km²99% commune
- Parnes12.89 km²100% commune
- Ivry-le-Temple12.84 km²100% commune
- Ménerval12.77 km²100% commune
- Dampierre-en-Bray12.75 km²100% commune
- Gancourt-Saint-Étienne12.55 km²100% commune
- Saint-Clair-sur-Epte12.45 km²100% commune
- Omerville12.22 km²100% commune
- Vesly11.70 km²100% commune
- Avesnes-en-Bray11.68 km²100% commune
- Haussez11.49 km²85% commune
- Heudicourt11.47 km²100% commune
- Hébécourt11.43 km²100% commune
- Boury-en-Vexin11.32 km²100% commune
- Bazincourt-sur-Epte11.32 km²100% commune
- Le Coudray-Saint-Germer11.29 km²84% commune
- Elbeuf-en-Bray11.28 km²100% commune
- Hodeng-Hodenger11.18 km²98% commune
- Fresneaux-Montchevreuil11.02 km²100% commune
- Chauvincourt-Provemont11.00 km²100% commune
- Bézu-Saint-Éloi10.99 km²100% commune
- Montroty10.96 km²100% commune
- Gournay-en-Bray10.90 km²100% commune
- Saint-Quentin-des-Prés10.89 km²98% commune
- Saint-Pierre-es-Champs10.85 km²100% commune
- Genainville10.46 km²100% commune
- Le Fossé10.30 km²99% commune
- Lalandelle10.23 km²87% commune
- Beaumont-les-Nonains10.02 km²100% commune
- Liancourt-Saint-Pierre9.98 km²76% commune
- Heubécourt-Haricourt9.84 km²82% commune
- Hacqueville9.69 km²96% commune
- Trie-Château9.64 km²100% commune
- Cuy-Saint-Fiacre9.57 km²100% commune
- Bézu-la-Forêt9.38 km²100% commune
- Talmontiers9.23 km²100% commune
- Neaufles-Saint-Martin8.97 km²100% commune
- Amenucourt8.94 km²100% commune
- Villers-sur-Auchy8.92 km²100% commune
- Valdampierre8.86 km²100% commune
- Senantes8.80 km²44% commune
- Serans8.69 km²99% commune
- Éragny-sur-Epte8.63 km²100% commune
- Puchay8.61 km²61% commune
- Gamaches-en-Vexin8.57 km²100% commune
- Mésangueville8.43 km²79% commune
- Fay-les-Étangs8.39 km²100% commune
- Reilly8.20 km²100% commune
- Mainneville8.12 km²100% commune
- Puiseux-en-Bray8.09 km²100% commune
- Bus-Saint-Rémy8.05 km²100% commune
- Delincourt8.03 km²100% commune
- Ambleville7.99 km²100% commune
- Le Vaumain7.83 km²100% commune
- Boutencourt7.81 km²100% commune
- Dangu7.77 km²100% commune
- Banthelu7.70 km²94% commune
- Civières7.56 km²100% commune
- Hannaches7.49 km²78% commune
- Neuville-Bosc7.46 km²86% commune
- Ernemont-la-Villette7.46 km²100% commune
- Boisemont7.34 km²55% commune
- La Ferté-Saint-Samson7.33 km²38% commune
- Nucourt7.28 km²93% commune
- Fourges7.15 km²100% commune
- Le Vauroux7.15 km²73% commune
- Hécourt7.15 km²93% commune
- Montreuil-sur-Epte7.10 km²100% commune
- Hénonville7.03 km²99% commune
- Fresne-Léguillon7.01 km²100% commune
- Buhy6.79 km²100% commune
- Authevernes6.79 km²84% commune
- Sainte-Marie-de-Vatimesnil6.79 km²95% commune
- Farceaux6.78 km²92% commune
- Courcelles-lès-Gisors6.72 km²100% commune
- Fleury6.70 km²100% commune
- Tourny6.60 km²53% commune
- La Houssoye6.59 km²99% commune
- Boissy-le-Bois6.48 km²100% commune
- Bernouville6.47 km²100% commune
- Chambors6.42 km²100% commune
- Maudétour-en-Vexin6.41 km²96% commune
- Senots6.41 km²100% commune
- Limetz-Villez6.27 km²64% commune
- Énencourt-le-Sec6.25 km²100% commune
- Sancourt6.24 km²100% commune
- Thibivillers6.18 km²100% commune
- Guerny6.15 km²100% commune
- Berthenonville6.13 km²100% commune
- Bachivillers6.11 km²100% commune
- Amécourt6.08 km²100% commune
- Le Mesnil-Théribus6.02 km²100% commune
- Boubiers5.98 km²58% commune
- Le Thil-Riberpré5.97 km²60% commune
- Lalande-en-Son5.83 km²100% commune
- Doudeauville-en-Vexin5.83 km²100% commune
- Fours-en-Vexin5.74 km²100% commune
- Dampsmesnil5.66 km²100% commune
- Mesnil-sous-Vienne5.60 km²100% commune
- Bosc-Hyons5.60 km²100% commune
- Loconville5.53 km²100% commune
- Noyers5.53 km²100% commune
- Chérence5.42 km²61% commune
- Pommereux5.24 km²100% commune
- Montherlant5.16 km²100% commune
- Vaudancourt4.85 km²100% commune
- Château-sur-Epte4.85 km²100% commune
- La Neuve-Grange4.84 km²100% commune
- Monneville4.84 km²52% commune
- Bosquentin4.78 km²77% commune
- Arthies4.70 km²61% commune
- Saussay-la-Campagne4.68 km²100% commune
- La Bellière4.67 km²100% commune
- Énencourt-Léage4.57 km²100% commune
- Hardivillers-en-Vexin4.53 km²100% commune
- Molagnies4.51 km²100% commune
- Villers-en-Vexin4.50 km²69% commune
- Trie-la-Ville4.47 km²100% commune
- Porcheux4.36 km²100% commune
- Bouchevilliers4.35 km²100% commune
- Hadancourt-le-Haut-Clocher4.30 km²52% commune
- Pouilly4.29 km²100% commune
- Ressons-l'Abbaye4.25 km²79% commune
- Sainte-Geneviève-lès-Gasny4.23 km²100% commune
- Le Thil4.23 km²100% commune
- Martagny4.20 km²100% commune
- Saint-Michel-d'Halescourt4.14 km²89% commune
- Serqueux4.09 km²69% commune
- Montagny-en-Vexin4.07 km²100% commune
- Villers-sur-Trie4.07 km²100% commune
- Hodent4.07 km²100% commune
- La Neuville-Garnier4.07 km²51% commune
- Bois-Jérôme-Saint-Ouen3.92 km²39% commune
- Villeneuve-les-Sablons3.85 km²89% commune
- Jaméricourt3.78 km²100% commune
- Bray-et-Lû3.78 km²100% commune
- Longmesnil3.74 km²100% commune
- Charmont3.63 km²100% commune
- Doudeauville3.62 km²100% commune
- Tilly3.59 km²28% commune
- La Chapelle-en-Vexin3.51 km²100% commune
- Giverny3.48 km²54% commune
- Gommecourt3.48 km²61% commune
- Cahaignes3.41 km²37% commune
- Monts3.40 km²100% commune
- Lattainville3.36 km²100% commune
- Villotran3.29 km²64% commune
- Auneuil3.24 km²14% commune
- Bazancourt3.17 km²95% commune
- Mesnil-Verclives3.13 km²32% commune
- Tourly2.43 km²72% commune
- Gaillefontaine1.93 km²7% commune
- La Roche-Guyon1.92 km²38% commune
- Coudray1.57 km²20% commune
- Cléry-en-Vexin1.36 km²28% commune
- Les Thilliers-en-Vexin1.28 km²89% commune
- Lilly1.21 km²20% commune
- Villers-Vermont1.17 km²18% commune
- Auteuil1.07 km²9% commune
- Amblainville1.06 km²5% commune
- Villers-en-Arthies0.96 km²11% commune
- Troussures0.95 km²19% commune
- Forges-les-Eaux0.88 km²16% commune
- Fontenay0.86 km²12% commune
- Mézières-en-Vexin0.79 km²6% commune
- Argueil0.68 km²10% commune
- Compainville0.62 km²10% commune
- Panilleuse0.48 km²6% commune
- Berville0.43 km²5% commune
- Haute-Isle0.38 km²18% commune
- Écouis0.30 km²2% commune
- La Neuville-d'Aumont0.21 km²4% commune
- Bennecourt0.16 km²3% commune
- Lyons-la-Forêt0.13 km²0% commune
- Fleury-la-Forêt0.13 km²2% commune
- Le Bellay-en-Vexin0.12 km²2% commune
- Lormaison0.11 km²2% commune
- Haravilliers0.09 km²1% commune
- Buicourt0.08 km²2% commune
- Escames0.07 km²1% commune
- Cuigy-en-Bray0.06 km²1% commune
- Bouconvillers0.05 km²1% commune
- Chavençon0.03 km²0% commune
- Lierville0.02 km²0% commune
- Corbeil-Cerf0.02 km²1% commune
- Fontenay-Torcy0.02 km²0% commune
- La Feuillie0.02 km²0% commune
- Sully0.02 km²0% commune
- Beaubec-la-Rosière0.02 km²0% commune
- Wy-dit-Joli-Village0.02 km²0% commune
22 intersecting protected areas
Vexin Français
IUCN VRegional Nature Park
164.84 km² overlap
Vallée de l'Epte francilienne et ses affluents
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
36.67 km² overlap
Pays de Bray humide
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
22.64 km² overlap
Vallée de l'Epte
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.61 km² overlap
Pays de Bray – Cuestas Nord et Sud
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.33 km² overlap
Coteaux et boucles de la seine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.03 km² overlap
Cuesta du Bray
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.37 km² overlap
Landes et forêts humides du Bas Bray de l'Oise
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.99 km² overlap
Regional Nature Reserve
0.81 km² overlap
13 more protected areassorted by overlap area
le marais de reilly
IUCN IVLand acquired by a regional conservatory of natural areas
0.35 km² overlap
Biotope Protection Order
0.28 km² overlap
les patures
IUCN IVLand acquired by a regional conservatory of natural areas
0.27 km² overlap
la tourbiere du bas-bois
IUCN IVLand acquired by a regional conservatory of natural areas
0.20 km² overlap
les coteaux de neuf-marche
IUCN IVLand acquired by a regional conservatory of natural areas
0.16 km² overlap
Sites chiroptères du Vexin français
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.12 km² overlap
les coteaux de giverny
IUCN IVLand acquired by a regional conservatory of natural areas
0.11 km² overlap
le parc a poulain
IUCN IVLand acquired by a regional conservatory of natural areas
0.05 km² overlap
Biotope Protection Order
0.04 km² overlap
les fiefs
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
vallee de l epte
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Bassin de l'Arques
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Coteaux De La Seine
IUCN IVNational Nature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 498 distinct species · 468 770 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 l'Epte : 28 espèces reliées par 131 interactions GloBI sur 6 types (connectance 17.7%, 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°
10,2°C
Annual rain
662mm
Moisture idx (CMI)
-0,15
Runoff
334mm/an
PET
782mm
AET
542mm
Mean slope
2,4°
Water table
182cm
Forest
1%
Crops
57%
Urban
2%
Protected
11%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)