HydroBASINS lev08 watershed · #2080022030
Bassin du Dan
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
169,8km²
Upstream area
2 935,5km²
Discharge
58,01m³/s
Mean elev.
33m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de l'Odon216 km²
- Bassin de l'Orne45 km²
47 communes (GADM L5)Available for FRA, RWA
- Caen21.09 km²83% commune
- Biéville-Beuville11.47 km²100% commune
- Hérouville-Saint-Clair10.32 km²100% commune
- Mondeville9.06 km²100% commune
- Mathieu8.62 km²87% commune
- Ranville8.26 km²100% commune
- Colombelles7.42 km²100% commune
- Blainville-sur-Orne7.05 km²100% commune
- Saint-Contest5.63 km²69% commune
- Bénouville5.61 km²100% commune
- Giberville4.81 km²100% commune
- Escoville4.71 km²100% commune
- Amfreville4.67 km²76% commune
- Ouistreham4.41 km²45% commune
- Hérouvillette4.30 km²100% commune
- Soliers4.24 km²74% commune
- Grentheville3.71 km²94% commune
- Démouville3.64 km²100% commune
- Cagny3.55 km²42% commune
- Anisy3.35 km²81% commune
- Bourguébus3.25 km²60% commune
- Bréville-les-Monts3.13 km²63% commune
- Cambes-en-Plaine2.98 km²100% commune
- Cormelles-le-Royal2.88 km²85% commune
- Périers-sur-le-Dan2.74 km²100% commune
- Tilly-la-Campagne1.99 km²60% commune
- Cuverville1.94 km²100% commune
- Ifs1.85 km²20% commune
- Épron1.77 km²100% commune
- Villons-les-Buissons1.75 km²51% commune
- Saint-Aubin-d'Arquenay1.72 km²56% commune
- Hubert-Folie1.60 km²85% commune
- Touffréville1.38 km²24% commune
- Garcelles-Secqueville1.21 km²22% commune
- Bavent1.06 km²6% commune
- Banneville-la-Campagne0.64 km²10% commune
- Sannerville0.57 km²11% commune
- Saint-Germain-la-Blanche-Herbe0.41 km²17% commune
- Anguerny0.27 km²9% commune
- Colleville-Montgomery0.27 km²3% commune
- Sallenelles0.25 km²16% commune
- Louvigny0.14 km²2% commune
- Rocquancourt0.13 km²5% commune
- Hermanville-sur-Mer0.11 km²1% commune
- Saint-Aignan-de-Cramesnil0.10 km²2% commune
- Fleury-sur-Orne0.06 km²1% commune
- Colomby-sur-Thaon0.03 km²1% commune
3 intersecting protected areas
Estuaire de l\'orne
IUCN IVLand acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)
1.25 km² overlap
Estuaire de l'Orne
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.21 km² overlap
roseliere de benouville
IUCN IVLand acquired by a regional conservatory of natural areas
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 369 distinct species · 107 775 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Dan : 23 espèces reliées par 93 interactions GloBI sur 6 types (connectance 15.6%, 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°
10,6°C
Annual rain
688mm
Moisture idx (CMI)
-0,09
Runoff
583mm/an
PET
761mm
AET
540mm
Mean slope
1,1°
Water table
86cm
Forest
0%
Crops
50%
Urban
59%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)