HydroBASINS lev08 watershed · #2080022330
Bassin de l'Yères
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 : Seine-Maritime
Sub-basin area
367,3km²
Upstream area
367,3km²
Discharge
0,89m³/s
Mean elev.
130m
Administrative coverage
1 dept-equivalent regions (GADM L2)
- 361.4 km²98.1% of basin
66 communes (GADM L5)Available for FRA, RWA
- Grandcourt22.31 km²97% commune
- Criel-sur-Mer21.48 km²100% commune
- Saint-Martin-le-Gaillard17.67 km²100% commune
- Dancourt16.98 km²94% commune
- Avesnes-en-Val14.64 km²89% commune
- Callengeville14.32 km²84% commune
- Fallencourt11.85 km²100% commune
- Smermesnil10.70 km²80% commune
- Cuverville-sur-Yères10.39 km²93% commune
- Fresnoy-Folny10.18 km²76% commune
- Saint-Riquier-en-Rivière9.97 km²100% commune
- Saint-Léger-aux-Bois9.72 km²83% commune
- Le Caule-Sainte-Beuve9.71 km²57% commune
- Preuseville8.79 km²100% commune
- Sept-Meules8.58 km²100% commune
- Aubermesnil-aux-Érables8.43 km²100% commune
- Guilmécourt8.39 km²100% commune
- Villy-sur-Yères7.91 km²100% commune
- Foucarmont7.26 km²100% commune
- Villers-sous-Foucarmont7.04 km²100% commune
- Canehan6.21 km²100% commune
- Auquemesnil6.05 km²100% commune
- Assigny6.04 km²100% commune
- Saint-Martin-en-Campagne5.66 km²80% commune
- Biville-sur-Mer5.59 km²100% commune
- Touffreville-sur-Eu5.51 km²100% commune
- Rétonval5.41 km²100% commune
- Berneval-le-Grand5.30 km²100% commune
- Flocques5.04 km²99% commune
- Puisenval5.00 km²100% commune
- Bracquemont4.99 km²100% commune
- Le Tréport4.75 km²69% commune
- Penly4.75 km²100% commune
- Saint-Rémy-Boscrocourt4.07 km²46% commune
- Réalcamp3.66 km²32% commune
- Brunville3.59 km²92% commune
- Tocqueville-sur-Eu3.53 km²100% commune
- Greny3.45 km²98% commune
- Baromesnil3.41 km²43% commune
- Dieppe3.29 km²27% commune
- Melleville3.24 km²37% commune
- Belleville-sur-Mer3.23 km²100% commune
- Saint-Quentin-au-Bosc2.89 km²80% commune
- Auvilliers2.58 km²52% commune
- Le Mesnil-Réaume2.52 km²46% commune
- Saint-Pierre-des-Jonquières2.22 km²27% commune
- Gouchaupre1.77 km²41% commune
- Martin-Église1.66 km²17% commune
- Grèges1.65 km²52% commune
- Ancourt1.19 km²9% commune
- Derchigny0.97 km²18% commune
- Vatierville0.89 km²19% commune
- Les Ifs0.85 km²20% commune
- Richemont0.75 km²7% commune
- Blangy-sur-Bresle0.51 km²3% commune
- Étalondes0.50 km²12% commune
- Saint-Germain-sur-Eaulne0.46 km²5% commune
- Bailly-en-Rivière0.39 km²2% commune
- Tourville-la-Chapelle0.37 km²5% commune
- Landes-Vieilles-et-Neuves0.30 km²4% commune
- Intraville0.24 km²5% commune
- Clais0.17 km²1% commune
- Guerville0.16 km²1% commune
- Wanchy-Capval0.16 km²1% commune
- Rieux0.11 km²2% commune
- Monchaux-Soreng0.00 km²0% commune
9 intersecting protected areas
L'Yères
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
9.44 km² overlap
Littoral Cauchois
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.44 km² overlap
Littoral Cauchois
IUCN Not ReportedMarine Protected Area (OSPAR)
4.75 km² overlap
La forêt d'Eu et les pelouses adjacentes
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.18 km² overlap
Marine Nature Park
1.00 km² overlap
Basse vallee de l\'yeres
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.26 km² overlap
Val au pretre
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.16 km² overlap
mont de mesnil-reaume
IUCN IVLand acquired by a regional conservatory of natural areas
0.10 km² overlap
le marais du petit villers
IUCN IVLand acquired by a regional conservatory of natural areas
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 271 distinct species · 71 257 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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'Yères : 22 espèces reliées par 135 interactions GloBI sur 6 types (connectance 24.1%, 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°
10,1°C
Annual rain
696mm
Moisture idx (CMI)
-0,05
Runoff
582mm/an
PET
734mm
AET
530mm
Mean slope
3,2°
Water table
177cm
Forest
1%
Crops
54%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)