HydroBASINS lev08 watershed · #2080358540
Bassin de Wełna
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 : Chodzież, Oborniki, Poznań
Sub-basin area
122,1km²
Upstream area
2 350km²
Discharge
8,07m³/s
Mean elev.
80m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Mała Wełna683 km²
- Bassin de Wełna2 km²
3 dept-equivalent regions (GADM L2)
- Oborniki81.3 km²66.3% of basin
- Chodzież39.8 km²32.4% of basin
- 1.5 km²1.2% of basin
7 intersecting protected areas
Dolina Wełny i Rynna Gołaniecko-Wągrowiecka
IUCN Not AssignedProtected Landscape Area
15.74 km² overlap
Puszcza Notecka
IUCN Not ReportedSpecial Protection Area (Birds Directive)
5.98 km² overlap
Dolina Wełny
IUCN Not ReportedSite of Community Importance (Habitats Directive)
4.46 km² overlap
Buczyna w Długiej Goślinie
IUCN Not ReportedSite of Community Importance (Habitats Directive)
2.51 km² overlap
Buczyna
IUCN IVNature Reserve
0.13 km² overlap
Promenada
IUCN IVNature Reserve
0.04 km² overlap
Wełna
IUCN IVNature Reserve
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
434 distinct species · 1 843 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 41 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 Wełna : 31 espèces reliées par 80 interactions GloBI sur 7 types (connectance 9.8%, 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°
7,9°C
Annual rain
547mm
Moisture idx (CMI)
-0,24
Runoff
111mm/an
PET
724mm
AET
465mm
Mean slope
0,5°
Water table
76cm
Forest
10%
Crops
65%
Urban
5%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)