HydroBASINS lev08 watershed · #2080375320
Bassin de Wielka
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 4 administrative regions : Gniezno, Poznań, Września, Środa Wielkopolska
Sub-basin area
659km²
Upstream area
659km²
Discharge
2,19m³/s
Mean elev.
91m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- Środa Wielkopolska353.4 km²53.4% of basin
- Września209.9 km²31.7% of basin
- 96.9 km²14.7% of basin
- Gniezno1.4 km²0.2% of basin
9 intersecting protected areas
Landscape Park
10.89 km² overlap
Dolina Średzkiej Strugi
IUCN Not ReportedSite of Community Importance (Habitats Directive)
5.58 km² overlap
Lasy Żerkowsko-Czeszewskie
IUCN Not ReportedSite of Community Importance (Habitats Directive)
4.57 km² overlap
Rogalińska Dolina Warty
IUCN Not ReportedSite of Community Importance (Habitats Directive)
3.51 km² overlap
Ostoja Rogalińska
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.53 km² overlap
Obszar Chronionego Krajobrazu w gminie Kórnik
IUCN Not AssignedProtected Landscape Area
2.11 km² overlap
Dolina Środkowej Warty
IUCN Not ReportedSpecial Protection Area (Birds Directive)
1.65 km² overlap
Bagna Średzkie
IUCN Not AssignedProtected Landscape Area
1.58 km² overlap
Grądy w Czerniejewie
IUCN Not ReportedSite of Community Importance (Habitats Directive)
0.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 699 distinct species · 731 866 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Wielka : 31 espèces reliées par 60 interactions GloBI sur 6 types (connectance 8.1%, filtre Serrano α=0.2). 8 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°
8,2°C
Annual rain
523mm
Moisture idx (CMI)
-0,30
Runoff
105mm/an
PET
749mm
AET
448mm
Mean slope
0,5°
Water table
39cm
Forest
4%
Crops
69%
Urban
2%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)