HydroBASINS lev08 watershed · #2080436870
Bassin de Grailsbach
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 : Alzey-Worms, Bergstraße, Donnersbergkreis, Worms
Sub-basin area
168,2km²
Upstream area
69 139,9km²
Discharge
1 496,97m³/s
Mean elev.
159m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Pfrimm253 km²
- Bassin de Eisbach209 km²
4 dept-equivalent regions (GADM L2)
- 120.0 km²71.1% of basin
- Worms36.7 km²21.7% of basin
- 10.9 km²6.5% of basin
- 1.1 km²0.7% of basin
9 intersecting protected areas
Landscape Protection Area
54.56 km² overlap
Ackerplateau zwischen Ilbesheim und Flomborn
IUCN Not ReportedSpecial Protection Area (Birds Directive)
14.17 km² overlap
Höllenbrand
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.00 km² overlap
Landscape Protection Area
4.95 km² overlap
Rheinauen bei Biblis und Groß-Rohrheim
IUCN Not ReportedSpecial Protection Area (Birds Directive)
2.86 km² overlap
Maulbeeraue
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.24 km² overlap
Steiner Wald von Nordheim
IUCN IVNature Reserve
1.23 km² overlap
Kalksteinbrüche Rosengarten
IUCN IVNature Reserve
0.10 km² overlap
Nature Reserve
0.09 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 891 distinct species · 73 715 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Grailsbach : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 66 interactions GloBI sur 4 types (connectance 10.5%, filtre Serrano α=0.2). 6 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°
9,5°C
Annual rain
620mm
Moisture idx (CMI)
-0,22
Runoff
215mm/an
PET
792mm
AET
522mm
Mean slope
1,7°
Water table
169cm
Forest
1%
Crops
59%
Urban
20%
Protected
35%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)