HydroBASINS lev08 watershed · #4081157090
Bassin de Mahaweli River
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 7 administrative regions : Dehiattakandiya, Dimbulagala, Elahera, Laggala-Pallegama, Mahiyanganaya +2
Sub-basin area
666km²
Upstream area
5 832,2km²
Discharge
164,3m³/s
Mean elev.
90m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Badulu Oya1609 km²
- Bassin de Ulhiti Oya444 km²
7 dept-equivalent regions (GADM L2)
- 178.9 km²27.0% of basin
- 165.7 km²25.0% of basin
- DehiattakandiyaAmpara · Sri Lanka156.5 km²23.6% of basin
- 146.1 km²22.0% of basin
- Laggala-PallegamaMatale · Sri Lanka14.1 km²2.1% of basin
- 1.4 km²0.2% of basin
- MahiyanganayaBadulla · Sri Lanka0.6 km²0.1% of basin
8 intersecting protected areas
Wasgamuwa
IUCN IINational Park
271.11 km² overlap
Flood Plains
IUCN IINational Park
19.86 km² overlap
Riverine
IUCN IVNature Reserve
17.30 km² overlap
Weeralanda
IUCN IbReserved Forest
5.97 km² overlap
Maduru Oya
IUCN IINational Park
4.96 km² overlap
Weheragala
IUCN IbReserved Forest
1.30 km² overlap
Paludeniya
IUCN IbReserved Forest
0.68 km² overlap
Naminioya
IUCN IbReserved Forest
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
399 distinct species · 4 600 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Mahaweli River : 33 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 30 interactions GloBI sur 3 types (connectance 4.8%, 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°
27,1°C
Annual rain
1 929mm
Moisture idx (CMI)
0,20
Runoff
702mm/an
PET
1 552mm
AET
1 216mm
Mean slope
1,9°
Water table
106cm
Forest
39%
Crops
25%
Urban
2%
Protected
48%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)