HydroBASINS lev08 watershed · #2080409990
Bassin de Agger
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 : Altenkirchen (Westerwald), Märkischer Kreis, Oberbergischer Kreis, Olpe, Rhein-Sieg-Kreis +1
Sub-basin area
827,4km²
Upstream area
827,4km²
Discharge
8,59m³/s
Mean elev.
260m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
6 dept-equivalent regions (GADM L2)
- 534.8 km²64.4% of basin
- 165.0 km²19.9% of basin
- 110.8 km²13.3% of basin
- 15.7 km²1.9% of basin
- Olpe3.7 km²0.4% of basin
- Altenkirchen (Westerwald)0.4 km²0.0% of basin
30 intersecting protected areas
Landscape Protection Area
71.30 km² overlap
Landscape Protection Area
58.75 km² overlap
Landscape Protection Area
54.19 km² overlap
Landscape Protection Area
53.23 km² overlap
Landscape Protection Area
52.06 km² overlap
Landscape Protection Area
49.53 km² overlap
Landscape Protection Area
42.07 km² overlap
Landscape Protection Area
40.42 km² overlap
LSG-Wiehl <2.2.1>
IUCN VLandscape Protection Area
33.54 km² overlap
21 more protected areassorted by overlap area
Landscape Protection Area
33.47 km² overlap
Landscape Protection Area
28.75 km² overlap
LSG-Meinerzhagen - Typ A
IUCN VLandscape Protection Area
13.27 km² overlap
LSG Bergische Hochfläche
IUCN VLandscape Protection Area
12.97 km² overlap
Landscape Protection Area
12.21 km² overlap
LSG Staatsforst Sieg
IUCN VLandscape Protection Area
11.88 km² overlap
Wiehltalsperre
IUCN IVNature Reserve
9.65 km² overlap
Landscape Protection Area
9.49 km² overlap
Vogelschutzgebiet 'Wahner Heide'
IUCN Not ReportedSpecial Protection Area (Birds Directive)
9.44 km² overlap
Naafbachtal
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
9.24 km² overlap
Nature Reserve
9.14 km² overlap
NSG Naafbachtal <SU>
IUCN IVNature Reserve
8.52 km² overlap
Wahner Heide
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
8.49 km² overlap
Landscape Protection Area
6.41 km² overlap
LSG-Zone 1
IUCN VLandscape Protection Area
5.21 km² overlap
Landscape Protection Area
4.16 km² overlap
NSG Koenigsforst
IUCN IVNature Reserve
3.30 km² overlap
Landscape Protection Area
3.26 km² overlap
NSG Puhlbruch / Silberkuhle
IUCN IVNature Reserve
3.23 km² overlap
Königsforst
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.99 km² overlap
Vogelschutzgebiet Königsforst
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.99 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 319 distinct species · 120 735 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Agger : 18 espèces reliées par 118 interactions GloBI sur 6 types (connectance 22.3%, filtre Serrano α=0.2). 15 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°
8,8°C
Annual rain
875mm
Moisture idx (CMI)
0,18
Runoff
327mm/an
PET
712mm
AET
584mm
Mean slope
6,3°
Water table
365cm
Forest
75%
Crops
5%
Urban
30%
Protected
82%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)