HydroBASINS lev08 watershed · #2080411180
Bassin de Sieg
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 : Bonn, Rhein-Sieg-Kreis
Sub-basin area
18,7km²
Upstream area
2 900,3km²
Discharge
30,07m³/s
Mean elev.
62m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Agger827 km²
- Bassin de Wahnbach284 km²
2 dept-equivalent regions (GADM L2)
- Bonn10.3 km²54.9% of basin
- 8.5 km²45.1% of basin
13 intersecting protected areas
Siegaue und Siegmündung
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.65 km² overlap
LSG-Siegaue
IUCN VLandscape Protection Area
2.38 km² overlap
NSG Siegaue <LP Siegmündung>
IUCN IVNature Reserve
2.05 km² overlap
Landscape Protection Area
1.50 km² overlap
Landscape Protection Area
1.31 km² overlap
Nature Reserve
1.19 km² overlap
Siebengebirge
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.14 km² overlap
NSG Siegmuendung
IUCN IVNature Reserve
0.64 km² overlap
Landscape Protection Area
0.27 km² overlap
4 more protected areassorted by overlap area
Landscape Protection Area
0.08 km² overlap
Nature Reserve
0.06 km² overlap
LSG-Auf dem Bungert
IUCN VLandscape Protection Area
0.06 km² overlap
Landscape Protection Area
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 755 distinct species · 17 693 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 42 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 Sieg : 33 espèces reliées par 117 interactions GloBI sur 6 types (connectance 13.6%, 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°
10,0°C
Annual rain
745mm
Moisture idx (CMI)
-0,04
Runoff
266mm/an
PET
773mm
AET
585mm
Mean slope
0,9°
Water table
70cm
Forest
9%
Crops
15%
Urban
100%
Protected
38%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)