HydroBASINS lev08 watershed · #2080405620
Bassin de Demer
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 3 administrative regions : Antwerpen, Limburg, Vlaams Brabant
Sub-basin area
587,9km²
Upstream area
2 329,2km²
Discharge
28,62m³/s
Mean elev.
39m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Velpe935 km²
- Bassin de Herk806 km²
3 dept-equivalent regions (GADM L2)
- 362.4 km²61.4% of basin
- 227.1 km²38.5% of basin
- Antwerpen0.5 km²0.1% of basin
30 intersecting protected areas
Militair domein en vallei van de Zwarte Beek
IUCN Not ReportedSpecial Protection Area (Birds Directive)
42.64 km² overlap
Vallei- en brongebied van de Zwarte Beek, Bolisserbeek en Dommel met heide en vengebieden
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
37.41 km² overlap
De Demervallei
IUCN Not ReportedSpecial Protection Area (Birds Directive)
36.92 km² overlap
Demervallei
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
33.13 km² overlap
NBP-LI-20-0016 type 2
IUCN VINature management plan type 2 (Flemish Region)
22.52 km² overlap
Valleien van de Winge en de Motte met valleihellingen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
18.63 km² overlap
De Demervallei ten oosten van Aarschot
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
16.87 km² overlap
De Demervallei ten westen van Aarschot
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
9.99 km² overlap
NBP-LI-19-0006 type 4
IUCN IVNature management plan type 4 (Flemish Region)
9.89 km² overlap
21 more protected areassorted by overlap area
De Vallei van de Drie Beken
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
7.64 km² overlap
De Wingevallei
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
6.72 km² overlap
De Bossen van Averbode
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
6.60 km² overlap
NBP-LI-19-0114 type 2
IUCN VINature management plan type 2 (Flemish Region)
5.70 km² overlap
De Boven- en middenloop Zwarte Beek
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
5.65 km² overlap
De Midden- en benedenloop Zwarte Beek
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
5.48 km² overlap
NBP-VB-23-0008 type 4
IUCN IVNature management plan type 4 (Flemish Region)
4.44 km² overlap
Het Walenbos
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
4.34 km² overlap
NBP-VB-20-0293 type 4
IUCN IVNature management plan type 4 (Flemish Region)
4.31 km² overlap
Valleien van de Laambeek, Zonderikbeek, Slangebeek en Roosterbeek met vijvergebieden
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.07 km² overlap
Webbekomsbroek-Borchbeemden
IUCN IVNature management plan type 4 (Flemish Region)
3.81 km² overlap
De Helderbeek-Hokselaar
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
3.65 km² overlap
Vijvercomplex van Midden Limburg
IUCN Not ReportedSpecial Protection Area (Birds Directive)
3.61 km² overlap
NBP-LI-22-0117 type 2
IUCN VINature management plan type 2 (Flemish Region)
3.01 km² overlap
De Eikelberg, Wijngaardberg, Beninksberg en \'s Hertogenheide
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
2.83 km² overlap
NBP-VB-18-0001 type 4
IUCN IVNature management plan type 4 (Flemish Region)
2.81 km² overlap
Het Vijvergebied Midden-Limburg
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
2.80 km² overlap
NBP-AN-21-0103 type 4
IUCN IVNature management plan type 4 (Flemish Region)
2.79 km² overlap
NBP-VB-21-0022 type 4
IUCN IVNature management plan type 4 (Flemish Region)
2.68 km² overlap
NBP/LI/20/0231 type 4
IUCN IVNature management plan type 4 (Flemish Region)
2.46 km² overlap
Het Rot- , Gorenbroek en Diesters Broek
IUCN Not AssignedFlemish Ecological Network (Flemish Region)
2.27 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 645 distinct species · 2 017 791 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Demer : 22 espèces reliées par 138 interactions GloBI sur 6 types (connectance 19.6%, filtre Serrano α=0.2). 16 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°
9,8°C
Annual rain
802mm
Moisture idx (CMI)
0,08
Runoff
410mm/an
PET
736mm
AET
571mm
Mean slope
1,3°
Water table
76cm
Forest
14%
Crops
31%
Urban
46%
Protected
20%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)