HydroBASINS lev08 watershed · #2080377770
Bassin de Großer Graben
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 : Börde, Harz, Helmstedt, Wolfenbüttel
Sub-basin area
792,6km²
Upstream area
792,6km²
Discharge
4,9m³/s
Mean elev.
129m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 318.6 km²40.0% of basin
- 235.6 km²29.6% of basin
- Helmstedt151.4 km²19.0% of basin
- Wolfenbüttel90.1 km²11.3% of basin
30 intersecting protected areas
Landscape Protection Area
33.03 km² overlap
Huy
IUCN VLandscape Protection Area
31.39 km² overlap
Großes Bruch
IUCN VLandscape Protection Area
27.30 km² overlap
Fallstein
IUCN VLandscape Protection Area
17.59 km² overlap
Harbke-Allertal
IUCN VLandscape Protection Area
17.43 km² overlap
Elm
IUCN VLandscape Protection Area
12.33 km² overlap
Landscape Protection Area
12.26 km² overlap
Huy nördlich Halberstadt
IUCN Not ReportedSpecial Protection Area (Birds Directive)
11.30 km² overlap
Huy nördlich Halberstadt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
11.30 km² overlap
21 more protected areassorted by overlap area
Großes Bruch
IUCN VLandscape Protection Area
9.36 km² overlap
Großes Bruch bei Wulferstedt
IUCN IVNature Reserve
8.05 km² overlap
Fallsteingebiet nördlich Osterwieck
IUCN Not ReportedSpecial Protection Area (Birds Directive)
6.72 km² overlap
Fallsteingebiet nördlich Osterwieck
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
6.72 km² overlap
Nature monuments
6.10 km² overlap
Elm
IUCN VLandscape Protection Area
5.14 km² overlap
Landscape Protection Area
4.61 km² overlap
Hohes Holz bei Eggenstedt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.66 km² overlap
Heeseberg-Gebiet
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
2.77 km² overlap
Landscape Protection Area
1.79 km² overlap
Nature Reserve
1.73 km² overlap
Mühlenberg
IUCN VLandscape Protection Area
1.45 km² overlap
Nature Reserve
1.41 km² overlap
Großes Bruch bei Wulferstedt
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.78 km² overlap
Grabensystem Großes Bruch
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.76 km² overlap
Landscape Protection Area
0.73 km² overlap
Großer Fallstein
IUCN IVNature Reserve
0.70 km² overlap
Osteroder Holz
IUCN IVNature Reserve
0.53 km² overlap
Heeseberg
IUCN IVNature Reserve
0.51 km² overlap
Aderstedter Busch
IUCN IVNature Reserve
0.44 km² overlap
Ehemalige Bahntrasse zwischen Semmenstedt, Mattierzoll und Börßum sowie angrenzende Landschaftsteile
IUCN VLandscape Protection Area
0.42 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 679 distinct species · 33 980 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Großer Graben : 18 espèces reliées par 103 interactions GloBI sur 6 types (connectance 19.5%, 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°
8,7°C
Annual rain
571mm
Moisture idx (CMI)
-0,21
Runoff
197mm/an
PET
722mm
AET
484mm
Mean slope
1,7°
Water table
172cm
Forest
2%
Crops
74%
Urban
2%
Protected
20%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)