HydroBASINS lev08 watershed · #2080036610
Bassin de Hofstaddalselva
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 : Flatanger, Mandalseid, Namsos, Osen, Roan +1
Sub-basin area
1 594,1km²
Upstream area
1 594,1km²
Discharge
17,43m³/s
Mean elev.
207m
Administrative coverage
6 dept-equivalent regions (GADM L2)
- 437.3 km²27.3% of basin
- 335.2 km²20.9% of basin
- 310.5 km²19.4% of basin
- 224.6 km²14.0% of basin
- 208.4 km²13.0% of basin
- 7.4 km²0.5% of basin
30 intersecting protected areas
Øyenskavlen
IUCN IaNature Reserve
16.38 km² overlap
Øyenskavlen og Tverrlimyran
IUCN Not ReportedEmerald Network
16.38 km² overlap
Elgsjøen
IUCN IaNature Reserve
15.30 km² overlap
Storvatnet og Gøllaustjønna
IUCN IaNature Reserve
14.80 km² overlap
Hemna
IUCN IaNature Reserve
11.09 km² overlap
Skjellådalen
IUCN IaNature Reserve
6.14 km² overlap
Hjartvikfjellet
IUCN IaNature Reserve
4.43 km² overlap
Aunskardet-Lakshølhaugen
IUCN IaNature Reserve
3.87 km² overlap
Krokvatnet
IUCN IaNature Reserve
2.98 km² overlap
21 more protected areassorted by overlap area
Merkesodden og Røstdalen
IUCN IaNature Reserve
1.83 km² overlap
Erikskulen
IUCN IaNature Reserve
1.48 km² overlap
Tostenelva
IUCN IaNature Reserve
1.48 km² overlap
Dale
IUCN IaNature Reserve
1.36 km² overlap
Inner Vargfossnesa
IUCN IaNature Reserve
1.20 km² overlap
Honnavasslia
IUCN IaNature Reserve
0.95 km² overlap
Litlstøelva
IUCN IaNature Reserve
0.89 km² overlap
Gaupdalen
IUCN IaNature Reserve
0.85 km² overlap
Bingsholmsråsa
IUCN IVWildlife Conservation Area
0.79 km² overlap
Urddalen
IUCN IaNature Reserve
0.75 km² overlap
Rundfjelldalselva
IUCN IaNature Reserve
0.71 km² overlap
Beingårdsmyra
IUCN IaNature Reserve
0.64 km² overlap
Seterelva
IUCN IaNature Reserve
0.63 km² overlap
Oksdøla
IUCN IaNature Reserve
0.60 km² overlap
Momyra
IUCN IaNature Reserve
0.56 km² overlap
Momyra
IUCN Not ReportedEmerald Network
0.56 km² overlap
Ledangsvalen
IUCN IaNature Reserve
0.54 km² overlap
Kariholet
IUCN IaNature Reserve
0.34 km² overlap
Gravhaugen
IUCN IaNature Reserve
0.31 km² overlap
Altskardet
IUCN IaNature Reserve
0.29 km² overlap
Buvika
IUCN IaNature Reserve
0.21 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 512 distinct species · 56 096 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Hofstaddalselva : 26 espèces dont 4 patrimoniales (LR IUCN CR/EN/VU) reliées par 83 interactions GloBI sur 6 types (connectance 13.2%, 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°
4,2°C
Annual rain
1 246mm
Moisture idx (CMI)
0,65
Runoff
1 482mm/an
PET
431mm
AET
411mm
Mean slope
12,3°
Water table
396cm
Forest
64%
Crops
0%
Urban
0%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)