HydroBASINS lev08 watershed · #4080048960
Bassin · #4080048960
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 8 administrative regions : Ambalangoda, Baddegama, Balapitiya, Bentota, Elpitiya +3
Sub-basin area
269,4km²
Upstream area
269,4km²
Discharge
4,03m³/s
Mean elev.
14m
Administrative coverage
8 dept-equivalent regions (GADM L2)
- 72.1 km²26.9% of basin
- 65.9 km²24.6% of basin
- 51.5 km²19.2% of basin
- 48.7 km²18.2% of basin
- 9.9 km²3.7% of basin
- 5.3 km²2.0% of basin
- 2.1 km²0.8% of basin
- 0.7 km²0.3% of basin
4 intersecting protected areas
Telwatta
IUCN IVSanctuary
13.73 km² overlap
Parapuduwa Nun's Island
IUCN IVSanctuary
3.78 km² overlap
Hikkaduwa NP
IUCN IINational Park
0.39 km² overlap
Kudalkanda
IUCN IbReserved Forest
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 115 distinct species · 19 602 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 · #4080048960 : 32 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 30 interactions GloBI sur 3 types (connectance 5.0%, 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°
26,7°C
Annual rain
3 092mm
Moisture idx (CMI)
0,58
Runoff
1 448mm/an
PET
1 302mm
AET
1 287mm
Mean slope
1,2°
Water table
32cm
Forest
0%
Crops
61%
Urban
79%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)