HydroBASINS lev08 watershed · #2080254430
Bassin de Hognerudsälven
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 : Bengtsfors, Lidköping, Mellerud, Säffle, Åmål +1
Sub-basin area
943,7km²
Upstream area
40 481,5km²
Discharge
406,31m³/s
Mean elev.
72m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Byälven555 km²
- Bassin · #208025313065 km²
6 dept-equivalent regions (GADM L2)
- 511.2 km²53.9% of basin
- 238.6 km²25.2% of basin
- 109.5 km²11.5% of basin
- 70.4 km²7.4% of basin
- 15.4 km²1.6% of basin
- 3.6 km²0.4% of basin
30 intersecting protected areas
Kållands skärgårdar
IUCN Not ReportedSpecial Protection Area (Birds Directive)
28.29 km² overlap
Kållands skärgårdar
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
28.29 km² overlap
Kållands skärgårdar
IUCN VNatura 2000 SPA
28.29 km² overlap
Kållands skärgårdar
IUCN VNatura 2000 SCI
28.29 km² overlap
Nature Conservation Area
28.29 km² overlap
2000330 Tösse skärgård
IUCN VNature Reserve
22.18 km² overlap
Tösse skärgård
IUCN VNatura 2000 SPA
22.14 km² overlap
Tösse skärgård
IUCN Not ReportedSpecial Protection Area (Birds Directive)
22.14 km² overlap
SK 524-2018
IUCN IVNature conservation agreement
3.88 km² overlap
21 more protected areassorted by overlap area
2002885 Brurmossen
IUCN IVNature Reserve
3.22 km² overlap
2014118 Olsmossen
IUCN IaNature Reserve
1.29 km² overlap
2000377 Parkudden
IUCN IIINature Conservation Area
0.98 km² overlap
2000378 Hindens udde-Svalnäs
IUCN IIINature Conservation Area
0.89 km² overlap
Baljåsen
IUCN IaNatura 2000 SPA
0.32 km² overlap
Baljåsen
IUCN IaNatura 2000 SCI
0.32 km² overlap
Baljåsen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.32 km² overlap
Baljåsen
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.32 km² overlap
2000353 Baljåsen
IUCN IaNature Reserve
0.32 km² overlap
2013008 Orsberget
IUCN IaNature Reserve
0.27 km² overlap
2010944 Kilafjället
IUCN IaNature Reserve
0.26 km² overlap
2002208 Yttre Hedane
IUCN IVNature Reserve
0.25 km² overlap
Tjursholmarna
IUCN Not ReportedSpecial Protection Area (Birds Directive)
0.23 km² overlap
Tjursholmarna
IUCN Not AssignedNatura 2000 SPA
0.23 km² overlap
2025523 Tjursholmarna
IUCN Not AssignedWildlife and Plant Sanctuary
0.23 km² overlap
2025630 Måsbergen
IUCN Not AssignedWildlife and Plant Sanctuary
0.16 km² overlap
n/a.
IUCN IVNature conservation agreement, County Administrative Board
0.16 km² overlap
2025542 Norra Enholmarnas ostskär
IUCN Not AssignedWildlife and Plant Sanctuary
0.12 km² overlap
2025780 Otterholmarna
IUCN Not AssignedWildlife and Plant Sanctuary
0.12 km² overlap
2025492 Mellskär och Gråens sydö
IUCN Not AssignedWildlife and Plant Sanctuary
0.11 km² overlap
SK 141-2016
IUCN IVNature conservation agreement
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 600 distinct species · 154 246 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 26 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 Hognerudsälven : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 72 interactions GloBI sur 3 types (connectance 17.7%, 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°
6,1°C
Annual rain
690mm
Moisture idx (CMI)
0,17
Runoff
321mm/an
PET
574mm
AET
449mm
Mean slope
1,2°
Water table
109cm
Forest
33%
Crops
12%
Urban
1%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)