HydroBASINS lev08 watershed · #4081159030
Bassin de Kaluganga
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 12 administrative regions : Ayagama, Bulathsinhala, Eheliyagoda, Elapatha, Horana +7
Sub-basin area
417,7km²
Upstream area
1 680,2km²
Discharge
88,45m³/s
Mean elev.
121m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Kuru Ganga251 km²
- Bassin de Kaluganga50 km²
12 dept-equivalent regions (GADM L2)
- 120.5 km²29.0% of basin
- 97.3 km²23.4% of basin
- BulathsinhalaKalutara · Sri Lanka53.7 km²12.9% of basin
- EheliyagodaRatnapura · Sri Lanka41.9 km²10.1% of basin
- 33.2 km²8.0% of basin
- 29.3 km²7.1% of basin
- 19.1 km²4.6% of basin
- MadurawalaKalutara · Sri Lanka15.9 km²3.8% of basin
4 moreFull L2 list
- Kalawana2.6 km² · 0.6%
- Elapatha1.2 km² · 0.3%
- Nivithigala0.7 km² · 0.2%
- Millaniya0.4 km² · 0.1%
5 intersecting protected areas
Labugama Kalatuwawa
IUCN IbReserved Forest
4.68 km² overlap
Ingiriya
IUCN IbReserved Forest
4.49 km² overlap
Dambulluwana
IUCN IbReserved Forest
0.62 km² overlap
Eduragala
IUCN IaConservation Forest
0.25 km² overlap
Miriyagalla
IUCN IbReserved Forest
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 014 distinct species · 8 250 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 Kaluganga : 19 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 20 interactions GloBI sur 3 types (connectance 8.7%, 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°
26,5°C
Annual rain
3 942mm
Moisture idx (CMI)
0,62
Runoff
1 478mm/an
PET
1 496mm
AET
1 478mm
Mean slope
8,9°
Water table
325cm
Forest
28%
Crops
49%
Urban
27%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)