HydroBASINS lev08 watershed · #2080237550
Bassin de Örsundaån
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 : Enköping, Heby, Håbo, Knivsta, Upplands-Bro +1
Sub-basin area
1 162,5km²
Upstream area
1 162,9km²
Discharge
7,96m³/s
Mean elev.
52m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
6 dept-equivalent regions (GADM L2)
- 477.1 km²40.8% of basin
- 306.5 km²26.2% of basin
- 287.5 km²24.6% of basin
- 81.9 km²7.0% of basin
- Upplands-BroStockholm · Sweden15.4 km²1.3% of basin
- 0.6 km²0.0% of basin
30 intersecting protected areas
2002632 Skokloster
IUCN VNature Reserve
11.83 km² overlap
2020247 Focksta
IUCN IVNature Reserve
6.40 km² overlap
2049140 Hammarskog
IUCN VNature Reserve
5.00 km² overlap
Degermossen
IUCN Not AssignedNatura 2000 SCI
4.47 km² overlap
Degermossen
IUCN Not AssignedNatura 2000 SPA
4.47 km² overlap
Degermossen
IUCN Not ReportedSpecial Protection Area (Birds Directive)
4.47 km² overlap
Degermossen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.47 km² overlap
2002631 Arnöhuvud
IUCN VNature Reserve
2.45 km² overlap
2044169 Lindsjön
IUCN IaNature Reserve
2.21 km² overlap
21 more protected areassorted by overlap area
Stora och Lilla Ullfjärden
IUCN Not AssignedNatura 2000 SCI
2.17 km² overlap
Stora och Lilla Ullfjärden
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.17 km² overlap
2002041 Tränviksmossen
IUCN IaNature Reserve
1.58 km² overlap
Tränviksmossen
IUCN IaNatura 2000 SCI
1.57 km² overlap
Tränviksmossen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.57 km² overlap
Biskops-Arnö
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.41 km² overlap
Biskops-Arnö
IUCN Not AssignedNatura 2000 SCI
1.41 km² overlap
Degermossen
IUCN Not AssignedAgreement between government agencies
1.14 km² overlap
2002616 Fäbodmossen
IUCN IaNature Reserve
1.02 km² overlap
2044949 Anddalsglupen
IUCN IaNature Reserve
0.92 km² overlap
Styggkärret
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.83 km² overlap
Styggkärret
IUCN IVNatura 2000 SCI
0.83 km² overlap
2002613 Styggkärret
IUCN IVNature Reserve
0.83 km² overlap
Arnö huvud
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.82 km² overlap
Arnö huvud
IUCN VNatura 2000 SCI
0.82 km² overlap
2001832 Skattmansöådalen
IUCN IVNature Reserve
0.71 km² overlap
2002049 Sandviksåsen
IUCN IIINature Reserve
0.64 km² overlap
Sandviksåsen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.64 km² overlap
Sandviksåsen
IUCN IIINatura 2000 SCI
0.64 km² overlap
Fäbodmossen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.60 km² overlap
Fäbodmossen
IUCN IaNatura 2000 SCI
0.60 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
11 762 distinct species · 813 108 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Örsundaån : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 65 interactions GloBI sur 4 types (connectance 17.2%, filtre Serrano α=0.2). 9 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°
5,6°C
Annual rain
570mm
Moisture idx (CMI)
-0,01
Runoff
218mm/an
PET
574mm
AET
425mm
Mean slope
1,9°
Water table
137cm
Forest
57%
Crops
36%
Urban
0%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)