HydroBASINS lev08 watershed · #2080033860
Bassin de Tovdalsvassdraget
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 13 administrative regions : Arendal, Birkenes, Bygland, Evje og Hornnes, Froland +8
Sub-basin area
2 451,9km²
Upstream area
2 451,9km²
Discharge
15,07m³/s
Mean elev.
332m
Administrative coverage
13 dept-equivalent regions (GADM L2)
- 657.4 km²26.7% of basin
- 400.6 km²16.3% of basin
- 315.4 km²12.8% of basin
- 246.4 km²10.0% of basin
- 197.9 km²8.0% of basin
- 173.8 km²7.1% of basin
- 130.5 km²5.3% of basin
- 106.8 km²4.3% of basin
5 moreFull L2 list
- Evje og Hornnes70.9 km² · 2.9%
- Valle64.4 km² · 2.6%
- Fyresdal27.4 km² · 1.1%
- Vennesla4.3 km² · 0.2%
- Arendal3.4 km² · 0.1%
30 intersecting protected areas
Skjeggedalsheii
IUCN IaNature Reserve
27.71 km² overlap
Årdalen
IUCN Not ReportedEmerald Network
20.67 km² overlap
Årdalen
IUCN IaNature Reserve
20.65 km² overlap
Vereknutane
IUCN IaNature Reserve
17.45 km² overlap
Gardefjellet
IUCN IaNature Reserve
16.97 km² overlap
Raet
IUCN Not ReportedNational Park
7.49 km² overlap
Myklandsvatna
IUCN IaNature Reserve
7.12 km² overlap
Myklandsvatna
IUCN Not ReportedEmerald Network
7.12 km² overlap
Skråstadheia
IUCN Not ReportedEmerald Network
7.11 km² overlap
21 more protected areassorted by overlap area
Skråstadheia
IUCN IaNature Reserve
7.11 km² overlap
Hålandsheia
IUCN IaNature Reserve
6.52 km² overlap
Nature Reserve
5.60 km² overlap
Olashei
IUCN Not ReportedEmerald Network
5.04 km² overlap
Olashei
IUCN IaNature Reserve
5.04 km² overlap
Nature Reserve
4.53 km² overlap
Vågsdalsliane
IUCN IaNature Reserve
4.14 km² overlap
Jurdalsknuten
IUCN IaNature Reserve
3.47 km² overlap
Jurdalsknuten
IUCN Not ReportedEmerald Network
3.47 km² overlap
Lemfjellheia
IUCN IaNature Reserve
3.29 km² overlap
Hækjenkleiv
IUCN IaNature Reserve
3.10 km² overlap
Storåna
IUCN IaNature Reserve
3.05 km² overlap
Urdvatn og Kallingshei
IUCN IaNature Reserve
2.77 km² overlap
Reddalsvann
IUCN IaNature Reserve
2.34 km² overlap
Nedre Timenes
IUCN IaNature Reserve
2.27 km² overlap
Bjoruvstøyl
IUCN IaNature Reserve
2.22 km² overlap
Tveitvann
IUCN IaNature Reserve
2.18 km² overlap
Badstudalen
IUCN IaNature Reserve
1.73 km² overlap
Kalvøya - Ytre Tronderøya
IUCN IVProtected Landscape
1.60 km² overlap
Solbergheia
IUCN IaNature Reserve
1.55 km² overlap
Grøneliane
IUCN IaNature Reserve
1.54 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
12 660 distinct species · 661 470 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 Tovdalsvassdraget : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 102 interactions GloBI sur 6 types (connectance 18.2%, 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°
5,3°C
Annual rain
1 256mm
Moisture idx (CMI)
0,64
Runoff
1 022mm/an
PET
447mm
AET
432mm
Mean slope
6,7°
Water table
319cm
Forest
87%
Crops
2%
Urban
1%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)