HydroBASINS lev08 watershed · #4080048990
Bassin de Bentota
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 14 administrative regions : Agalawatta, Balapitiya, Bentota, Beruwala, Bulathsinhala +9
Sub-basin area
672,7km²
Upstream area
672,8km²
Discharge
36,12m³/s
Mean elev.
55m
Administrative coverage
14 dept-equivalent regions (GADM L2)
- WalallawitaKalutara · Sri Lanka185.4 km²27.7% of basin
- 128.5 km²19.2% of basin
- 106.0 km²15.8% of basin
- 90.8 km²13.6% of basin
- 63.3 km²9.4% of basin
- AgalawattaKalutara · Sri Lanka38.5 km²5.7% of basin
- 15.1 km²2.3% of basin
- 15.0 km²2.2% of basin
6 moreFull L2 list
- Balapitiya7.9 km² · 1.2%
- Dodangoda6.6 km² · 1.0%
- Nagoda6.4 km² · 1.0%
- Palindanuwara6.1 km² · 0.9%
- Thawalama0.1 km² · 0.0%
- Bulathsinhala0.0 km² · 0.0%
14 intersecting protected areas
Yagirala
IUCN IbReserved Forest
30.01 km² overlap
Polghakanda
IUCN IbReserved Forest
7.97 km² overlap
Kelunkanda
IUCN Not ReportedForest Reserve
2.72 km² overlap
Malambure
IUCN IbReserved Forest
2.50 km² overlap
Halwala
IUCN IaConservation Forest
2.06 km² overlap
Pelawatta
IUCN Not ReportedForest Reserve
1.04 km² overlap
Heycock
IUCN IbReserved Forest
0.58 km² overlap
Kahambiliyakanda
IUCN IaConservation Forest
0.42 km² overlap
Kabaragala
IUCN IaConservation Forest
0.32 km² overlap
5 more protected areassorted by overlap area
Kottagalkanda
IUCN IbReserved Forest
0.13 km² overlap
Kananakanda
IUCN IaConservation Forest
0.13 km² overlap
Pituwalakanda
IUCN IbReserved Forest
0.13 km² overlap
Galaudakanda
IUCN IbReserved Forest
0.10 km² overlap
Deiyangaswala
IUCN IbReserved Forest
0.02 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
734 distinct species · 41 259 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 22 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 Bentota : 19 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 18 interactions GloBI sur 3 types (connectance 7.8%, 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 522mm
Moisture idx (CMI)
0,61
Runoff
1 487mm/an
PET
1 381mm
AET
1 368mm
Mean slope
5,8°
Water table
191cm
Forest
10%
Crops
64%
Urban
44%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)