HydroBASINS lev08 watershed · #4080896550
Bassin de Gandak Nahar
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 : Gopalganj, Kushinagar, Saran, Siwan
Sub-basin area
1 830,6km²
Upstream area
1 830,7km²
Discharge
24,06m³/s
Mean elev.
67m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
4 dept-equivalent regions (GADM L2)
- 990.4 km²54.2% of basin
- 630.3 km²34.5% of basin
- 137.3 km²7.5% of basin
- 69.2 km²3.8% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
57 distinct species · 117 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Gandak Nahar : 27 espèces reliées par 27 interactions GloBI sur 3 types (connectance 6.2%, filtre Serrano α=0.2). 3 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
1 068mm
Moisture idx (CMI)
-0,34
Runoff
413mm/an
PET
1 613mm
AET
799mm
Mean slope
0,0°
Water table
7cm
Forest
0%
Crops
100%
Urban
10%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)