HydroBASINS lev08 watershed · #2080036690
Bassin de Sandåa
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 : Mandalseid, Namsos, Overhalla, Steinkjer
Sub-basin area
464,6km²
Upstream area
464,6km²
Discharge
18,83m³/s
Mean elev.
231m
Administrative coverage
4 dept-equivalent regions (GADM L2)
- 236.9 km²50.7% of basin
- 125.6 km²26.9% of basin
- 59.0 km²12.6% of basin
- 46.0 km²9.8% of basin
6 intersecting protected areas
Kvamsfjellet
IUCN IaNature Reserve
12.82 km² overlap
Finntjønnin
IUCN IaNature Reserve
5.36 km² overlap
Husåstjønnbekken
IUCN IaNature Reserve
0.69 km² overlap
Klårtjønnhaugen
IUCN IaNature Reserve
0.43 km² overlap
Spillumsbekken
IUCN IaNature Reserve
0.39 km² overlap
Flåbekkåsen
IUCN IaNature Reserve
0.38 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 611 distinct species · 9 502 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 Sandåa : 22 espèces dont 5 patrimoniales (LR IUCN CR/EN/VU) reliées par 66 interactions GloBI sur 5 types (connectance 9.4%, filtre Serrano α=0.2). 16 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°
3,9°C
Annual rain
1 297mm
Moisture idx (CMI)
0,66
Runoff
1 266mm/an
PET
439mm
AET
420mm
Mean slope
10,1°
Water table
339cm
Forest
50%
Crops
0%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)