HydroBASINS lev08 watershed · #4080901010
Bassin de Koshi River
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 3 administrative regions : Darbhanga, Saharsa, Samastipur
Sub-basin area
197,7km²
Upstream area
6 457,2km²
Discharge
120,11m³/s
Mean elev.
45m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin · #4080897520525 km²
- Bassin · #4080897730316 km²
3 dept-equivalent regions (GADM L2)
- 93.9 km²47.6% of basin
- 86.4 km²43.8% of basin
- 17.0 km²8.6% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
52 distinct species · 125 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 19 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 Koshi River : 15 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 20 interactions GloBI sur 2 types (connectance 11.7%, filtre Serrano α=0.2). 4 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°
25,4°C
Annual rain
991mm
Moisture idx (CMI)
-0,37
Runoff
565mm/an
PET
1 583mm
AET
801mm
Mean slope
0,0°
Water table
4cm
Forest
0%
Crops
68%
Urban
13%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)