HydroBASINS lev08 watershed · #2080023020
Bassin de Wennetjes
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 5 administrative regions : 's-Gravenhage, Katwijk, Rotterdam, Wassenaar, Westland
Sub-basin area
96,6km²
Upstream area
96,6km²
Discharge
0,92m³/s
Mean elev.
4m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- 33.2 km²34.2% of basin
- 26.4 km²27.2% of basin
- 17.4 km²18.0% of basin
- 8.8 km²9.1% of basin
- 3.2 km²3.3% of basin
9 intersecting protected areas
NNN-ZH
IUCN Not AssignedNature Reserves owned by professional nature management organizations
36.74 km² overlap
Meijendel & Berkheide
IUCN IVNature Conservation Act
21.58 km² overlap
Meijendel & Berkheide
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
21.58 km² overlap
Solleveld & Kapittelduinen
IUCN IVNature Conservation Act
7.53 km² overlap
Solleveld & Kapittelduinen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
7.53 km² overlap
Westduinpark & Wapendal
IUCN IVNature Conservation Act
2.46 km² overlap
Westduinpark & Wapendal
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.46 km² overlap
Coepelduynen
IUCN IVNature Conservation Act
0.00 km² overlap
Coepelduynen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
15 180 distinct species · 3 050 435 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 43 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 Wennetjes : 35 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 118 interactions GloBI sur 5 types (connectance 13.1%, filtre Serrano α=0.2). 8 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
772mm
Moisture idx (CMI)
0,21
Runoff
494mm/an
PET
610mm
AET
502mm
Mean slope
0,4°
Water table
22cm
Forest
2%
Crops
11%
Urban
86%
Protected
32%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)