HydroBASINS lev08 watershed · #2080022110
Bassin de Canal de Retour
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 : Calvados, Eure
Sub-basin area
40km²
Upstream area
40km²
Discharge
0,05m³/s
Mean elev.
77m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 36.4 km²90.9% of basin
- 2.6 km²6.5% of basin
13 communes (GADM L5)Available for FRA, RWA
- Saint-Pierre-du-Val10.43 km²85% commune
- Fatouville-Grestain7.43 km²66% commune
- Beuzeville7.33 km²32% commune
- Berville-sur-Mer5.25 km²82% commune
- Boulleville3.83 km²55% commune
- Honfleur1.71 km²12% commune
- Fiquefleur-Équainville0.89 km²9% commune
- Conteville0.65 km²6% commune
- Ablon0.55 km²4% commune
- Le Torpt0.42 km²6% commune
- La Rivière-Saint-Sauveur0.34 km²6% commune
- Manneville-la-Raoult0.17 km²2% commune
- Saint-Samson-de-la-Roque0.02 km²0% commune
10 intersecting protected areas
Regional Nature Park
16.18 km² overlap
Estuaire de la Seine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
5.64 km² overlap
Estuaire de la Seine
IUCN Not ReportedMarine Protected Area (OSPAR)
5.28 km² overlap
Rives de seine sud - 27
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
2.83 km² overlap
Estuaire et marais de la Basse Seine
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.78 km² overlap
Marais Vernier et Vallée de la Risle maritime
IUCN Not ReportedWetland of International Importance (Ramsar Site)
0.66 km² overlap
Marais Vernier, Risle Maritime
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.46 km² overlap
Rives de seine sud - 14
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.39 km² overlap
Estuaire de la Seine
IUCN Not ReportedMarine Protected Area (OSPAR)
0.14 km² overlap
1 more protected areassorted by overlap area
Estuaire De La Seine
IUCN IVNational Nature Reserve
0.14 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 559 distinct species · 10 848 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Canal de Retour : 18 espèces reliées par 87 interactions GloBI sur 6 types (connectance 20.0%, 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°
10,4°C
Annual rain
700mm
Moisture idx (CMI)
-0,09
Runoff
613mm/an
PET
771mm
AET
544mm
Mean slope
2,3°
Water table
132cm
Forest
8%
Crops
41%
Urban
8%
Protected
43%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)