HydroBASINS lev08 watershed · #2080033190
Bassin de Viskan
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 9 administrative regions : Bollebygd, Borås, Falkenberg, Herrljunga, Kungsbacka +4
Sub-basin area
2 177km²
Upstream area
2 177,3km²
Discharge
39,75m³/s
Mean elev.
149m
Administrative coverage
9 dept-equivalent regions (GADM L2)
- 824.6 km²37.7% of basin
- 648.7 km²29.6% of basin
- 347.6 km²15.9% of basin
- 197.8 km²9.0% of basin
- 101.9 km²4.7% of basin
- 31.9 km²1.5% of basin
- 21.6 km²1.0% of basin
- 7.3 km²0.3% of basin
1 moreFull L2 list
- Falkenberg6.7 km² · 0.3%
30 intersecting protected areas
2000398 Rya Åsar
IUCN VNature Reserve
5.09 km² overlap
2042826 Storsjön
IUCN IbNature Reserve
4.65 km² overlap
2022969 Vänga mosse
IUCN IaNature Reserve
2.21 km² overlap
2000354 Assbergs raviner
IUCN IVNature Reserve
0.86 km² overlap
2004534 Stackenäs
IUCN IaNature Reserve
0.85 km² overlap
Mölarp och Kröklingshage
IUCN IVNatura 2000 SCI
0.79 km² overlap
Mölarp och Kröklingshage
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.79 km² overlap
2012479 Ramsholmens odlingslandskap
IUCN Not AssignedOthers
0.74 km² overlap
2000548 Mölarp
IUCN IVNature Reserve
0.65 km² overlap
21 more protected areassorted by overlap area
2000521 Hyltenäs kulle
IUCN IIINature Reserve
0.59 km² overlap
2000564 Björkesbacka
IUCN IVNature Reserve
0.55 km² overlap
2004985 Valasjö
IUCN Not AssignedWildlife and Plant Sanctuary
0.53 km² overlap
2029078 Övre Lia
IUCN IaNature Reserve
0.43 km² overlap
SK 253-1999
IUCN IVNature conservation agreement, Swedish Forest Agency
0.38 km² overlap
2014941 Stoms ås
IUCN IaNature Reserve
0.36 km² overlap
2005564 Älmås
IUCN IVNature Reserve
0.35 km² overlap
Stoms ås
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.34 km² overlap
Stoms ås
IUCN IaNatura 2000 SCI
0.34 km² overlap
2012995 Märkedalen
IUCN IaNature Reserve
0.32 km² overlap
2026989 Letebo
IUCN IaNature Reserve
0.30 km² overlap
2053382 Lindö
IUCN Not AssignedWildlife and Plant Sanctuary
0.27 km² overlap
SK 361-2015
IUCN IaHabitat Protection Area
0.24 km² overlap
2014125 Gäddevik
IUCN IVNature Reserve
0.22 km² overlap
2014213 Skoga
IUCN IaNature Reserve
0.22 km² overlap
2000545 Sundholmen
IUCN IVNature Reserve
0.20 km² overlap
SK 105-2017
IUCN IVNature conservation agreement, Swedish Forest Agency
0.19 km² overlap
SK 16-2003
IUCN IVNature conservation agreement, Swedish Forest Agency
0.18 km² overlap
SK 1161-2002
IUCN IVNature conservation agreement, Swedish Forest Agency
0.18 km² overlap
SK 305-2016
IUCN IVNature conservation agreement, Swedish Forest Agency
0.18 km² overlap
SK 184-2016
IUCN IaHabitat Protection Area
0.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
12 404 distinct species · 1 255 113 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 Viskan : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 85 interactions GloBI sur 4 types (connectance 16.1%, 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°
6,5°C
Annual rain
895mm
Moisture idx (CMI)
0,37
Runoff
552mm/an
PET
565mm
AET
478mm
Mean slope
3,2°
Water table
267cm
Forest
85%
Crops
10%
Urban
2%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)