HydroBASINS lev08 watershed · #2080033580
Bassin de Svartelva
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 3 administrative regions : Bærum, Oslo, Ringerike
Sub-basin area
302,8km²
Upstream area
302,8km²
Discharge
1,14m³/s
Mean elev.
288m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 137.4 km²45.1% of basin
- 79.6 km²26.1% of basin
- 72.4 km²23.8% of basin
30 intersecting protected areas
Krokskogen
IUCN IaNature Reserve
5.99 km² overlap
Oppkuven - Smeddalen
IUCN Not ReportedEmerald Network
4.10 km² overlap
Oppkuven - Smeddalen
IUCN IaNature Reserve
4.10 km² overlap
Kolsås/Dælivann
IUCN Not ReportedEmerald Network
3.93 km² overlap
Kolsås-Dælivann
IUCN VProtected Landscape
3.45 km² overlap
Blankvann og Lørensetertjern
IUCN Not ReportedEmerald Network
1.88 km² overlap
Blankvann
IUCN VProtected Landscape
1.64 km² overlap
Oust
IUCN Not ReportedEmerald Network
1.22 km² overlap
Oust
IUCN IaNature Reserve
1.21 km² overlap
21 more protected areassorted by overlap area
Hovedøya
IUCN Not ReportedEmerald Network
0.71 km² overlap
Spålen-Katnosa
IUCN IaNature Reserve
0.63 km² overlap
Spålen-Katnosa
IUCN Not ReportedEmerald Network
0.63 km² overlap
Gardlaushøgda
IUCN IaNature Reserve
0.58 km² overlap
Triungsvann
IUCN IaNature Reserve
0.56 km² overlap
Gressholmen-Rambergøya
IUCN Not ReportedEmerald Network
0.45 km² overlap
Gressholmen-Rambergøya
IUCN IaNature Reserve
0.45 km² overlap
Hovedøya
IUCN VProtected Landscape
0.38 km² overlap
Kolsåsstupene
IUCN IaNature Reserve
0.34 km² overlap
Borøya
IUCN IaNature Reserve
0.27 km² overlap
Borøya
IUCN Not ReportedEmerald Network
0.27 km² overlap
Karusspytten
IUCN IaNature Reserve
0.22 km² overlap
Koksabukta
IUCN Not ReportedEmerald Network
0.20 km² overlap
Koksabukta
IUCN IaNature Reserve
0.20 km² overlap
Prinsesseåsen
IUCN IaNature Reserve
0.17 km² overlap
Hengsåsen
IUCN Not ReportedEmerald Network
0.17 km² overlap
Østre Hovedøya
IUCN IaNature Reserve
0.16 km² overlap
Storøykilen
IUCN Not ReportedEmerald Network
0.15 km² overlap
Storøykilen
IUCN IaNature Reserve
0.15 km² overlap
Stubberud skogpark
IUCN IaNature Reserve
0.11 km² overlap
Hovedøya
IUCN IVProtected Landscape
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
14 747 distinct species · 988 995 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Svartelva : 24 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 84 interactions GloBI sur 4 types (connectance 16.9%, 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°
4,5°C
Annual rain
775mm
Moisture idx (CMI)
0,30
Runoff
608mm/an
PET
541mm
AET
452mm
Mean slope
6,6°
Water table
313cm
Forest
70%
Crops
0%
Urban
31%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)