HydroBASINS lev08 watershed · #2080360820
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 2 administrative regions : Oborniki, Poznań
Sub-basin area
101,8km²
Upstream area
2 782,1km²
Discharge
9,65m³/s
Mean elev.
78m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Flinta331 km²
- Bassin de Wełna122 km²
2 dept-equivalent regions (GADM L2)
- Oborniki91.5 km²89.6% of basin
- 10.7 km²10.4% of basin
8 intersecting protected areas
Puszcza Notecka
IUCN Not ReportedSpecial Protection Area (Birds Directive)
28.88 km² overlap
Dolina Wełny i Rynna Gołaniecko-Wągrowiecka
IUCN Not AssignedProtected Landscape Area
23.17 km² overlap
Dolina Wełny
IUCN Not ReportedSite of Community Importance (Habitats Directive)
8.47 km² overlap
Buczyna w Długiej Goślinie
IUCN Not ReportedSite of Community Importance (Habitats Directive)
3.19 km² overlap
Puszcza Notecka
IUCN Not AssignedProtected Landscape Area
0.22 km² overlap
Wełna
IUCN IVNature Reserve
0.10 km² overlap
Biedrusko
IUCN Not ReportedSite of Community Importance (Habitats Directive)
0.06 km² overlap
Buczyna
IUCN IVNature Reserve
0.03 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
895 distinct species · 5 502 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 48 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 : 40 espèces reliées par 97 interactions GloBI sur 5 types (connectance 8.2%, 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°
8,0°C
Annual rain
539mm
Moisture idx (CMI)
-0,26
Runoff
108mm/an
PET
730mm
AET
459mm
Mean slope
0,9°
Water table
153cm
Forest
23%
Crops
53%
Urban
9%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)