HydroBASINS lev08 watershed · #2080022070
Bassin du Drochon
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 : Calvados
Sub-basin area
50,9km²
Upstream area
50,9km²
Discharge
0,96m³/s
Mean elev.
64m
Administrative coverage
17 communes (GADM L5)Available for FRA, RWA
- Gonneville-sur-Mer13.03 km²96% commune
- Villers-sur-Mer8.51 km²94% commune
- Blonville-sur-Mer6.97 km²97% commune
- Houlgate4.53 km²100% commune
- Benerville-sur-Mer2.92 km²100% commune
- Auberville2.57 km²100% commune
- Tourgéville2.29 km²18% commune
- Saint-Vaast-en-Auge2.05 km²71% commune
- Dives-sur-Mer1.60 km²25% commune
- Deauville1.19 km²32% commune
- Vauville0.33 km²7% commune
- Douville-en-Auge0.28 km²4% commune
- Saint-Pierre-Azif0.15 km²2% commune
- Grangues0.04 km²1% commune
- Cabourg0.04 km²1% commune
- Saint-Arnoult0.01 km²0% commune
- Trouville-sur-Mer0.00 km²0% commune
9 intersecting protected areas
Falaises des vaches noires
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.13 km² overlap
Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.90 km² overlap
Mont canisy
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
0.26 km² overlap
Estuaire et marais de la Basse Seine
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.07 km² overlap
Estuaire de la Seine
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.07 km² overlap
Estuaire de la Seine
IUCN Not ReportedMarine Protected Area (OSPAR)
0.07 km² overlap
Baie de Seine orientale
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.05 km² overlap
Littoral augeron
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.05 km² overlap
Biotope Protection Order
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 720 distinct species · 54 490 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 46 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 du Drochon : 23 espèces reliées par 182 interactions GloBI sur 6 types (connectance 12.3%, filtre Serrano α=0.2). 32 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
701mm
Moisture idx (CMI)
-0,08
Runoff
588mm/an
PET
764mm
AET
543mm
Mean slope
3,8°
Water table
202cm
Forest
13%
Crops
33%
Urban
12%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)