HydroBASINS lev08 watershed · #2080235180
Bassin de Skjærdalselva
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 9 administrative regions : Asker, Bærum, Flå, Hole, Krødsherad +4
Sub-basin area
1 324km²
Upstream area
10 150,7km²
Discharge
184,3m³/s
Mean elev.
334m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Begna2116 km²
- Bassin de Randselva390 km²
9 dept-equivalent regions (GADM L2)
- 738.0 km²55.4% of basin
- 237.2 km²17.8% of basin
- 139.4 km²10.5% of basin
- 101.6 km²7.6% of basin
- 56.1 km²4.2% of basin
- 50.9 km²3.8% of basin
- 6.0 km²0.5% of basin
- 1.4 km²0.1% of basin
1 moreFull L2 list
- Bærum0.9 km² · 0.1%
30 intersecting protected areas
Vikerfjell
IUCN IaNature Reserve
31.71 km² overlap
Vassfaret og Vidalen
IUCN Not ReportedEmerald Network
26.78 km² overlap
Vassfaret og Vidalen
IUCN VProtected Landscape
21.60 km² overlap
Såta
IUCN IaNature Reserve
17.03 km² overlap
Grønknuten
IUCN IaNature Reserve
11.72 km² overlap
Wetland of International Importance (Ramsar Site)
11.19 km² overlap
Nature Reserve
11.19 km² overlap
Søndre Tyrifjorden
IUCN IaNature Reserve
5.75 km² overlap
Storøysundet-Sælabonn
IUCN IaNature Reserve
5.73 km² overlap
21 more protected areassorted by overlap area
Tyrifjorden
IUCN Not ReportedEmerald Network
5.12 km² overlap
Haverstingen
IUCN IaNature Reserve
5.03 km² overlap
Finnemarka
IUCN IaNature Reserve
4.16 km² overlap
Steinsfjorden
IUCN IVHabitat management area
3.79 km² overlap
Krokskogstupene
IUCN IaNature Reserve
3.74 km² overlap
Vikersund-Bergsjø
IUCN IVHabitat management area
3.11 km² overlap
Bukollen
IUCN IaNature Reserve
2.77 km² overlap
Knipetjennåsen
IUCN IaNature Reserve
2.24 km² overlap
Hestebrennajuvet
IUCN IaNature Reserve
2.20 km² overlap
Mørkgonga
IUCN Not ReportedEmerald Network
1.56 km² overlap
Mørkgonga
IUCN IaNature Reserve
1.56 km² overlap
Averøya
IUCN Not ReportedEmerald Network
1.07 km² overlap
Karlsrudtangen
IUCN Not ReportedEmerald Network
0.87 km² overlap
Tverrbergkastet
IUCN IaNature Reserve
0.80 km² overlap
Tverrbergkastet
IUCN Not ReportedEmerald Network
0.78 km² overlap
Storås
IUCN IaNature Reserve
0.74 km² overlap
Ultvedttjern
IUCN Not ReportedEmerald Network
0.55 km² overlap
Synneren
IUCN Not ReportedEmerald Network
0.50 km² overlap
Ultvedttjern
IUCN IaNature Reserve
0.47 km² overlap
Juveren
IUCN Not ReportedEmerald Network
0.44 km² overlap
Melåa
IUCN IaNature Reserve
0.41 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
10 534 distinct species · 420 901 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Skjærdalselva : 26 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 88 interactions GloBI sur 5 types (connectance 13.2%, filtre Serrano α=0.2). 11 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°
3,8°C
Annual rain
738mm
Moisture idx (CMI)
0,25
Runoff
619mm/an
PET
549mm
AET
451mm
Mean slope
7,7°
Water table
290cm
Forest
79%
Crops
15%
Urban
1%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)