HydroBASINS lev08 watershed · #2080033650
Bassin de Lierelva
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 6 administrative regions : Asker, Drammen, Lier, Modum, Nedre Eiker +1
Sub-basin area
279,6km²
Upstream area
279,6km²
Discharge
6,14m³/s
Mean elev.
371m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 192.9 km²68.6% of basin
- 49.3 km²17.5% of basin
- 13.6 km²4.8% of basin
- 13.4 km²4.8% of basin
- 9.4 km²3.3% of basin
- 2.6 km²0.9% of basin
14 intersecting protected areas
Finnemarka
IUCN IaNature Reserve
42.20 km² overlap
Gjellebekkmyrene og Tranby
IUCN Not ReportedEmerald Network
0.90 km² overlap
Glitra
IUCN IaNature Reserve
0.46 km² overlap
Gjellebekkmyrene
IUCN IaNature Reserve
0.44 km² overlap
Tranby
IUCN VProtected Landscape
0.44 km² overlap
Asdøljuvet
IUCN Not ReportedEmerald Network
0.39 km² overlap
Asdøljuvet
IUCN IaNature Reserve
0.39 km² overlap
Tronstad
IUCN IaNature Reserve
0.35 km² overlap
Tronstad
IUCN Not ReportedEmerald Network
0.10 km² overlap
5 more protected areassorted by overlap area
Linnesstranda
IUCN Not ReportedEmerald Network
0.08 km² overlap
Linnesstranda
IUCN IaNature Reserve
0.08 km² overlap
Hørtekollen
IUCN IIINatural Monument
0.00 km² overlap
Røine skog
IUCN Not ReportedNatural Monument
0.00 km² overlap
Furuåsen og Hagahogget
IUCN IaNature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 976 distinct species · 293 118 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Lierelva : 18 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 81 interactions GloBI sur 4 types (connectance 17.4%, 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°
4,1°C
Annual rain
777mm
Moisture idx (CMI)
0,32
Runoff
681mm/an
PET
525mm
AET
445mm
Mean slope
7,2°
Water table
349cm
Forest
77%
Crops
9%
Urban
5%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)