HydroBASINS lev08 watershed · #2080379530
Bassin de Oudelaanmolensloot
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 16 administrative regions : 's-Gravenhage, Delft, Lansingerland, Leiden, Leidschendam-Voorburg +11
Sub-basin area
351,4km²
Upstream area
351,4km²
Discharge
5,1m³/s
Mean elev.
-1m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
16 dept-equivalent regions (GADM L2)
- 58.3 km²16.5% of basin
- 41.7 km²11.8% of basin
- 36.2 km²10.2% of basin
- 35.9 km²10.2% of basin
- 35.4 km²10.0% of basin
- 24.8 km²7.0% of basin
- 23.9 km²6.8% of basin
- 23.3 km²6.6% of basin
8 moreFull L2 list
- Rijswijk14.7 km² · 4.2%
- Zoetermeer14.6 km² · 4.1%
- Voorschoten10.8 km² · 3.1%
- Lansingerland10.5 km² · 3.0%
- Vlaardingen8.8 km² · 2.5%
- Schiedam5.4 km² · 1.5%
- Leiden5.0 km² · 1.4%
- Zoeterwoude3.3 km² · 0.9%
5 intersecting protected areas
NNN-ZH
IUCN Not AssignedNature Reserves owned by professional nature management organizations
27.74 km² overlap
Meijendel & Berkheide
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.39 km² overlap
Meijendel & Berkheide
IUCN IVNature Conservation Act
2.39 km² overlap
Solleveld & Kapittelduinen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.69 km² overlap
Solleveld & Kapittelduinen
IUCN IVNature Conservation Act
0.69 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
12 700 distinct species · 3 135 110 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 44 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 Oudelaanmolensloot : 35 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 119 interactions GloBI sur 6 types (connectance 12.6%, filtre Serrano α=0.2). 9 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
777mm
Moisture idx (CMI)
0,20
Runoff
492mm/an
PET
624mm
AET
509mm
Mean slope
0,2°
Water table
7cm
Forest
0%
Crops
17%
Urban
95%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)