HydroBASINS lev08 watershed · #5080003490
Bassin de Silau
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 5 administrative regions : Asahan, Batu Bara, Kota Tanjungbalai, Simalungun, Toba Samosir
Sub-basin area
1 470,1km²
Upstream area
1 470,1km²
Discharge
59m³/s
Mean elev.
342m
Administrative coverage
5 dept-equivalent regions (GADM L2)
- 1278.5 km²87.4% of basin
- 172.9 km²11.8% of basin
- 8.8 km²0.6% of basin
- 3.3 km²0.2% of basin
- 0.1 km²0.0% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
128 distinct species · 254 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 18 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 Silau : 18 espèces reliées par 10 interactions GloBI sur 3 types (connectance 6.5%, filtre Serrano α=0.2).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
24,9°C
Annual rain
2 309mm
Moisture idx (CMI)
0,28
Runoff
1 234mm/an
PET
1 633mm
AET
1 556mm
Mean slope
4,6°
Water table
111cm
Forest
22%
Crops
42%
Urban
6%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)