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
Graphe en cours d’indexation
Calcul du tissu écologique de cette entité.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 2s).
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)