HydroBASINS lev08 watershed · #4080049130
Bassin de Deduru Oya
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 2 administrative regions : Arachchikattuwa PS, Chilaw
Sub-basin area
2,5km²
Upstream area
3 473,3km²
Discharge
77,07m³/s
Mean elev.
8m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de Karambalan Oya778 km²
- Bassin de Deduru Oya93 km²
2 dept-equivalent regions (GADM L2)
- 2.1 km²85.3% of basin
- Arachchikattuwa PSPuttalam · Sri Lanka0.2 km²8.7% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
213 distinct species · 1 995 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Deduru Oya : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 34 interactions GloBI sur 3 types (connectance 7.3%, filtre Serrano α=0.2). 5 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°
27,8°C
Annual rain
1 471mm
Moisture idx (CMI)
-0,05
Runoff
672mm/an
PET
1 547mm
AET
1 161mm
Mean slope
0,4°
Water table
19cm
Forest
0%
Crops
48%
Urban
79%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)