HydroBASINS lev08 watershed · #2080032010
Bassin de Hällaån
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 3 administrative regions : Norrköping, Söderköping, Valdemarsvik
Sub-basin area
742,4km²
Upstream area
742,6km²
Discharge
2,47m³/s
Mean elev.
52m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 404.6 km²54.2% of basin
- 194.0 km²26.0% of basin
- 127.8 km²17.1% of basin
30 intersecting protected areas
Ramunderberget
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.71 km² overlap
Ramunderberget
IUCN Not AssignedNatura 2000 SCI
1.71 km² overlap
2001762 Ramunderberget
IUCN Not AssignedNature Reserve
1.71 km² overlap
Eknön-Slätbaken
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.60 km² overlap
Eknön-Slätbaken
IUCN VNatura 2000 SPA
1.60 km² overlap
2001459 Eknön
IUCN VNature Reserve
1.59 km² overlap
2011106 Hällerstadsjön
IUCN Not AssignedWildlife and Plant Sanctuary
1.49 km² overlap
2013556 Hälla
IUCN IaNature Reserve
0.97 km² overlap
2028251 Forsums gammelskog
IUCN IaNature Reserve
0.64 km² overlap
21 more protected areassorted by overlap area
2053281 Ramundersborg
IUCN IaNature Reserve
0.58 km² overlap
2001756 Norrkrog
IUCN IVNature Reserve
0.58 km² overlap
2001743 Harsbo-Sverkersholm
IUCN IVNature Reserve
0.57 km² overlap
Harsbo-Sverkersholm
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.50 km² overlap
Harsbo-Sverkersholm
IUCN IVNatura 2000 SCI
0.50 km² overlap
2045832 Svartdalen
IUCN IaNature Reserve
0.42 km² overlap
Eknön
IUCN VNatura 2000 SCI
0.40 km² overlap
Eknön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.40 km² overlap
2013359 Korpberget
IUCN IaNature Reserve
0.33 km² overlap
2048178 Vargmossen
IUCN IaNature Reserve
0.31 km² overlap
2043694 Käringbergen
IUCN IaNature Reserve
0.30 km² overlap
2014379 Dyhult
IUCN IaNature Reserve
0.20 km² overlap
Hattorp
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.18 km² overlap
Hattorp
IUCN Not AssignedNatura 2000 SCI
0.18 km² overlap
n/a.
IUCN IVNature conservation agreement, County Administrative Board
0.18 km² overlap
Norrkrog
IUCN IVNatura 2000 SCI
0.16 km² overlap
Norrkrog
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.16 km² overlap
SK 84-2001
IUCN IVNature conservation agreement, Swedish Forest Agency
0.16 km² overlap
SK 229-2018
IUCN IaHabitat Protection Area
0.13 km² overlap
2014455 Listorp
IUCN IaNature Reserve
0.11 km² overlap
SK 852-2002
IUCN IVNature conservation agreement, Swedish Forest Agency
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 522 distinct species · 222 146 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Hällaån : 21 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 103 interactions GloBI sur 5 types (connectance 20.8%, 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°
6,7°C
Annual rain
558mm
Moisture idx (CMI)
-0,06
Runoff
175mm/an
PET
597mm
AET
431mm
Mean slope
2,4°
Water table
142cm
Forest
56%
Crops
30%
Urban
0%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)