HydroBASINS lev08 watershed · #4080924850
Bassin de সুরমা নদী
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 : Cachar, Dima Hasao, Jaintia Hills, Sunamganj, Sylhet
Sub-basin area
1 908,5km²
Upstream area
1 908,6km²
Discharge
202,85m³/s
Mean elev.
309m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- SylhetSylhet · Bangladesh942.4 km²49.5% of basin
- 738.6 km²38.8% of basin
- 84.3 km²4.4% of basin
- 71.6 km²3.8% of basin
- SunamganjSylhet · Bangladesh67.5 km²3.5% of basin
2 intersecting protected areas
Khadimnagar
IUCN IVNational Park
3.22 km² overlap
Tilagar
IUCN Not ReportedEco Park
0.45 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
625 distinct species · 2 674 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Graphe en cours d’indexation
Calcul du tissu écologique de cette entité.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 2s).
Hydroclimate (BasinATLAS lev08)
Mean T°
23,3°C
Annual rain
3 639mm
Moisture idx (CMI)
0,62
Runoff
3 323mm/an
PET
1 391mm
AET
1 193mm
Mean slope
6,5°
Water table
233cm
Forest
21%
Crops
46%
Urban
8%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)