HydroBASINS lev08 watershed · #2080360930
Bassin de Westerveldse Aa
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 9 administrative regions : Dalfsen, Hardenberg, Hellendoorn, Olst-Wijhe, Ommen +4
Sub-basin area
489,5km²
Upstream area
4 376,1km²
Discharge
61,24m³/s
Mean elev.
3m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Twentekanaal1120 km²
- Bassin de Overijsselsche Vecht328 km²
9 dept-equivalent regions (GADM L2)
- 166.9 km²34.0% of basin
- 82.0 km²16.7% of basin
- 60.4 km²12.3% of basin
- 53.7 km²10.9% of basin
- 51.0 km²10.4% of basin
- 44.2 km²9.0% of basin
- 25.3 km²5.2% of basin
- 7.4 km²1.5% of basin
1 moreFull L2 list
- Olst-Wijhe0.6 km² · 0.1%
12 intersecting protected areas
NNN-OV
IUCN Not AssignedNature Reserves owned by professional nature management organizations
75.23 km² overlap
Nature Conservation Act
10.79 km² overlap
Uiterwaarden Zwarte Water en Vecht
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
10.53 km² overlap
Uiterwaarden Zwarte Water en Vecht
IUCN Not ReportedSpecial Protection Area (Birds Directive)
10.09 km² overlap
Sallandse Heuvelrug
IUCN IINational Park
6.06 km² overlap
Sallandse Heuvelrug
IUCN IVNature Conservation Act
4.53 km² overlap
Sallandse Heuvelrug
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.53 km² overlap
Sallandse Heuvelrug
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.53 km² overlap
Vecht- en Beneden-Reggegebied
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.73 km² overlap
3 more protected areassorted by overlap area
Nature Conservation Act
3.73 km² overlap
Olde Maten & Veerslootlanden
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.63 km² overlap
Nature Conservation Act
3.63 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 933 distinct species · 1 048 251 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Westerveldse Aa : 33 espèces + 5 bulles famille, 87 interactions GloBI documentées sur 4 types (connectance 12.4%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
9,1°C
Annual rain
773mm
Moisture idx (CMI)
0,11
Runoff
461mm/an
PET
687mm
AET
542mm
Mean slope
0,3°
Water table
18cm
Forest
8%
Crops
11%
Urban
13%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)