HydroBASINS lev08 watershed · #4080049300
Bassin de Malwathu 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 6 administrative regions : Madhu, Maha Vilachchiya, Manthai West, Musali, Nanaddan +1
Sub-basin area
490,3km²
Upstream area
3 345,1km²
Discharge
32,08m³/s
Mean elev.
38m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de Kal Aru642 km²
- Bassin de Malwathu Oya127 km²
6 dept-equivalent regions (GADM L2)
- 166.2 km²34.1% of basin
- 142.4 km²29.2% of basin
- VengalacheddiculamVavuniya · Sri Lanka100.8 km²20.6% of basin
- 60.9 km²12.5% of basin
- 11.9 km²2.4% of basin
- 5.8 km²1.2% of basin
9 intersecting protected areas
Periyamarippu
IUCN IbReserved Forest
71.27 km² overlap
Mavillu
IUCN IbReserved Forest
67.62 km² overlap
Maduroad
IUCN IbReserved Forest
66.63 km² overlap
Madhu Road
IUCN IVSanctuary
27.29 km² overlap
Vilaththkulam
IUCN IbReserved Forest
18.66 km² overlap
Wilpattu
IUCN IINational Park
11.50 km² overlap
Periyakuriyittikulam
IUCN IbReserved Forest
9.27 km² overlap
Gaint's Tank
IUCN IVSanctuary
2.14 km² overlap
Kurukkalputukulam
IUCN IbReserved Forest
2.09 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
242 distinct species · 1 067 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 30 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 Malwathu Oya : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 36 interactions GloBI sur 3 types (connectance 8.3%, 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°
27,6°C
Annual rain
1 223mm
Moisture idx (CMI)
-0,17
Runoff
299mm/an
PET
1 468mm
AET
889mm
Mean slope
0,5°
Water table
49cm
Forest
59%
Crops
4%
Urban
0%
Protected
19%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)