HydroBASINS lev08 watershed · #2080033830
Bassin de Storelva
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 8 administrative regions : Arendal, Froland, Gjerstad, Nissedal, Risør +3
Sub-basin area
545,8km²
Upstream area
545,8km²
Discharge
14,08m³/s
Mean elev.
199m
Administrative coverage
8 dept-equivalent regions (GADM L2)
- 324.5 km²59.1% of basin
- 116.1 km²21.2% of basin
- 41.7 km²7.6% of basin
- 30.8 km²5.6% of basin
- 18.2 km²3.3% of basin
- 12.2 km²2.2% of basin
- 1.2 km²0.2% of basin
- 0.7 km²0.1% of basin
11 intersecting protected areas
Stormyrlia
IUCN IaNature Reserve
0.72 km² overlap
Vakerknatten og Nøklefjell
IUCN IaNature Reserve
0.53 km² overlap
Ubergsfjell
IUCN IaNature Reserve
0.33 km² overlap
Våjemyrane
IUCN IaNature Reserve
0.29 km² overlap
Lauvåsen
IUCN IaNature Reserve
0.19 km² overlap
Rosstøl
IUCN IaNature Reserve
0.17 km² overlap
Gulspettvannet
IUCN IaNature Reserve
0.17 km² overlap
Jåvnesmyrane
IUCN IaNature Reserve
0.16 km² overlap
Buråsen
IUCN IaNature Reserve
0.10 km² overlap
2 more protected areassorted by overlap area
Lusemyr
IUCN IaNature Reserve
0.04 km² overlap
Urvassliene
IUCN IaNature Reserve
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 969 distinct species · 64 758 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 45 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 Storelva : 36 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 107 interactions GloBI sur 6 types (connectance 10.3%, filtre Serrano α=0.2). 10 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°
6,0°C
Annual rain
966mm
Moisture idx (CMI)
0,49
Runoff
862mm/an
PET
488mm
AET
442mm
Mean slope
6,0°
Water table
276cm
Forest
93%
Crops
2%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)