HydroBASINS lev08 watershed · #2080231370
Bassin de Randselva
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 4 administrative regions : Gran, Jevnaker, Lunner, Ringerike
Sub-basin area
389,8km²
Upstream area
3 805,6km²
Discharge
63,11m³/s
Mean elev.
319m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Gulsjøelva324 km²
- Bassin de Vigga193 km²
4 dept-equivalent regions (GADM L2)
- 151.7 km²38.7% of basin
- 138.2 km²35.3% of basin
- 83.2 km²21.2% of basin
- 18.9 km²4.8% of basin
12 intersecting protected areas
Langvassbrenna
IUCN IaNature Reserve
3.05 km² overlap
Igulsrud
IUCN IaNature Reserve
0.65 km² overlap
Galtedalstjerna
IUCN IaNature Reserve
0.57 km² overlap
Rankedal
IUCN IaNature Reserve
0.37 km² overlap
Hovsenga
IUCN IaNature Reserve
0.33 km² overlap
Jøvika og Tønnerud
IUCN IaNature Reserve
0.20 km² overlap
Svenådalen
IUCN IaNature Reserve
0.20 km² overlap
Viulkastet
IUCN IaNature Reserve
0.19 km² overlap
Dalen
IUCN IaNature Reserve
0.14 km² overlap
3 more protected areassorted by overlap area
Gullerudtjern
IUCN IaNature Reserve
0.01 km² overlap
Tønnerudtangen
IUCN IIINatural Monument
0.00 km² overlap
Maurtvedt
IUCN Not ReportedNatural Monument
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 357 distinct species · 121 710 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Randselva : 21 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 97 interactions GloBI sur 6 types (connectance 17.3%, 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°
3,8°C
Annual rain
734mm
Moisture idx (CMI)
0,25
Runoff
607mm/an
PET
550mm
AET
453mm
Mean slope
6,2°
Water table
277cm
Forest
67%
Crops
40%
Urban
3%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)