HydroBASINS lev08 watershed · #2080380590
Bassin de Gekanaliseerde Hollandsche IJssel
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 : Alphen aan den Rijn, Bodegraven-Reeuwijk, Capelle aan den IJssel, Gouda, IJsselstein +11
Sub-basin area
386,1km²
Upstream area
386,1km²
Discharge
5,87m³/s
Mean elev.
-3m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
16 dept-equivalent regions (GADM L2)
- 93.7 km²24.2% of basin
- 43.3 km²11.2% of basin
- 41.2 km²10.6% of basin
- OudewaterUtrecht · Netherlands37.0 km²9.6% of basin
- MontfoortUtrecht · Netherlands32.4 km²8.4% of basin
- 29.4 km²7.6% of basin
- 27.0 km²7.0% of basin
- LopikUtrecht · Netherlands26.1 km²6.7% of basin
8 moreFull L2 list
- Gouda18.2 km² · 4.7%
- IJsselstein15.3 km² · 4.0%
- Utrecht7.9 km² · 2.0%
- Capelle aan den IJssel6.9 km² · 1.8%
- Krimpen aan den IJssel4.2 km² · 1.1%
- Woerden3.1 km² · 0.8%
- Nieuwegein1.5 km² · 0.4%
- Rotterdam0.1 km² · 0.0%
6 intersecting protected areas
NNN-ZH
IUCN Not AssignedNature Reserves owned by professional nature management organizations
39.21 km² overlap
Broekvelden/Vettenbroek
IUCN Not ReportedWetland of International Importance (Ramsar Site)
6.97 km² overlap
Nature Conservation Act
6.97 km² overlap
Broekvelden, Vettenbroek & Polder Stein
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.97 km² overlap
Broekvelden, Vettenbroek & Polder Stein
IUCN Not ReportedSite of Community Importance (Habitats Directive)
5.19 km² overlap
NNN-UT
IUCN Not AssignedNature Reserves owned by professional nature management organizations
5.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 828 distinct species · 2 089 887 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 Gekanaliseerde Hollandsche IJssel : 30 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 128 interactions GloBI sur 6 types (connectance 14.2%, filtre Serrano α=0.2). 13 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°
9,5°C
Annual rain
796mm
Moisture idx (CMI)
0,17
Runoff
479mm/an
PET
659mm
AET
528mm
Mean slope
0,1°
Water table
3cm
Forest
3%
Crops
10%
Urban
46%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)