HydroBASINS lev08 watershed · #4080863100
Bassin de Gandak
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 across 2 countries : Kushinagar, Lumbini, Maharajganj, Narayani, Pashchim Champaran
Sub-basin area
1 055,6km²
Upstream area
37 246,3km²
Discharge
1 811,56m³/s
Mean elev.
135m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Binai338 km²
- Bassin de Narayani15 km²
5 dept-equivalent regions (GADM L2)
- 387.7 km²36.8% of basin
- 206.9 km²19.6% of basin
- 191.3 km²18.1% of basin
- 145.8 km²13.8% of basin
- 122.2 km²11.6% of basin
3 intersecting protected areas
Chitwan
IUCN IINational Park
162.19 km² overlap
Chitwan National Park
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
156.87 km² overlap
Chitwan - Buffer Zone
IUCN VINational Park - Buffer Zone
19.25 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
374 distinct species · 1 774 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 : 32 espèces dont 6 patrimoniales (LR IUCN CR/EN/VU) reliées par 43 interactions GloBI sur 3 types (connectance 6.8%, 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°
24,6°C
Annual rain
1 643mm
Moisture idx (CMI)
0,03
Runoff
895mm/an
PET
1 579mm
AET
931mm
Mean slope
1,9°
Water table
97cm
Forest
27%
Crops
56%
Urban
13%
Protected
53%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)