HydroBASINS lev08 watershed · #4080903120
Bassin de Son
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 : Arwal, Bhojpur, Patna, Saran
Sub-basin area
854,5km²
Upstream area
68 436,4km²
Discharge
1 244,57m³/s
Mean elev.
67m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Son989 km²
- Bassin de Son131 km²
4 dept-equivalent regions (GADM L2)
- 378.0 km²44.3% of basin
- 310.2 km²36.4% of basin
- 152.6 km²17.9% of basin
- 11.9 km²1.4% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
96 distinct species · 351 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 44 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 Son : 39 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 51 interactions GloBI sur 3 types (connectance 5.4%, filtre Serrano α=0.2). 5 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°
26,2°C
Annual rain
962mm
Moisture idx (CMI)
-0,41
Runoff
411mm/an
PET
1 620mm
AET
749mm
Mean slope
0,1°
Water table
19cm
Forest
0%
Crops
75%
Urban
15%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)