HydroBASINS lev08 watershed · #2080381300
Bassin de Bocholter 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 6 administrative regions across 2 countries : Aalten, Borken, Coesfeld, Oude IJsselstreek, Wesel +1
Sub-basin area
517,2km²
Upstream area
517,2km²
Discharge
5,05m³/s
Mean elev.
44m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
6 dept-equivalent regions (GADM L2)
- Borken438.9 km²84.5% of basin
- 39.0 km²7.5% of basin
- 26.8 km²5.2% of basin
- 9.7 km²1.9% of basin
- Wesel4.6 km²0.9% of basin
- Coesfeld0.2 km²0.0% of basin
30 intersecting protected areas
Landscape Protection Area
28.97 km² overlap
Landscape Protection Area
19.86 km² overlap
Landscape Protection Area
19.57 km² overlap
Landscape Protection Area
17.79 km² overlap
LSG Weseker Geest
IUCN VLandscape Protection Area
17.20 km² overlap
Landscape Protection Area
11.00 km² overlap
LSG Weseker Mark
IUCN VLandscape Protection Area
9.42 km² overlap
LSG Hoxfeld
IUCN VLandscape Protection Area
7.72 km² overlap
LSG Hogespork
IUCN VLandscape Protection Area
7.37 km² overlap
21 more protected areassorted by overlap area
Landscape Protection Area
7.27 km² overlap
Landscape Protection Area
6.95 km² overlap
Landscape Protection Area
5.93 km² overlap
Landscape Protection Area
5.40 km² overlap
Landscape Protection Area
5.31 km² overlap
LSG Die Berge
IUCN VLandscape Protection Area
5.01 km² overlap
NNN-GE
IUCN Not AssignedNature Reserves owned by professional nature management organizations
4.91 km² overlap
Landscape Protection Area
4.86 km² overlap
Landscape Protection Area
3.99 km² overlap
LSG Holtwicker Bach
IUCN VLandscape Protection Area
3.66 km² overlap
LSG Hemden
IUCN VLandscape Protection Area
3.57 km² overlap
Landscape Protection Area
3.55 km² overlap
Landscape Protection Area
3.45 km² overlap
Landscape Protection Area
3.42 km² overlap
LSG Rekener Berge
IUCN VLandscape Protection Area
3.38 km² overlap
Landscape Protection Area
3.18 km² overlap
Landscape Protection Area
3.17 km² overlap
LSG Bocholter Aa
IUCN VLandscape Protection Area
3.12 km² overlap
LSG Weisses Venn
IUCN VLandscape Protection Area
3.00 km² overlap
LSG Klostervenn
IUCN VLandscape Protection Area
2.84 km² overlap
Nature Reserve
2.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 249 distinct species · 246 870 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 Bocholter Aa : 24 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 136 interactions GloBI sur 5 types (connectance 16.6%, filtre Serrano α=0.2). 17 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°
9,6°C
Annual rain
790mm
Moisture idx (CMI)
0,09
Runoff
309mm/an
PET
717mm
AET
561mm
Mean slope
0,6°
Water table
61cm
Forest
6%
Crops
38%
Urban
14%
Protected
44%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)