HydroBASINS lev08 watershed · #4081155750
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 10 administrative regions : Galenbindunuwewa, Kahatagasdigiliya, Kebithigollewa, Maha Vilachchiya, Medawachchiya +5
Sub-basin area
966,2km²
Upstream area
966,2km²
Discharge
12,13m³/s
Mean elev.
105m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
10 dept-equivalent regions (GADM L2)
- 295.7 km²30.7% of basin
- 253.7 km²26.4% of basin
- 181.1 km²18.8% of basin
- 121.4 km²12.6% of basin
- 39.0 km²4.1% of basin
- 38.6 km²4.0% of basin
- VengalacheddiculamVavuniya · Sri Lanka17.3 km²1.8% of basin
- 14.4 km²1.5% of basin
2 moreFull L2 list
- Kebithigollewa0.9 km² · 0.1%
- Maha Vilachchiya0.0 km² · 0.0%
10 intersecting protected areas
Wedakanda
IUCN IbReserved Forest
33.73 km² overlap
Mahakandarawa
IUCN IVSanctuary
12.42 km² overlap
Hinna Forest
IUCN IbReserved Forest
10.04 km² overlap
Isenbessagala
IUCN IbReserved Forest
9.37 km² overlap
Mihintale
IUCN IbReserved Forest
5.72 km² overlap
Mihintale
IUCN IVSanctuary
5.34 km² overlap
Anuradhapura
IUCN IVSanctuary
4.42 km² overlap
Periyachipplkulam
IUCN IbReserved Forest
4.04 km² overlap
Nambakada Forest
IUCN IbReserved Forest
3.94 km² overlap
1 more protected areassorted by overlap area
Wellaragama
IUCN IbReserved Forest
2.89 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
419 distinct species · 7 614 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 : 28 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 37 interactions GloBI sur 3 types (connectance 7.0%, 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°
27,2°C
Annual rain
1 438mm
Moisture idx (CMI)
-0,09
Runoff
446mm/an
PET
1 589mm
AET
1 053mm
Mean slope
0,8°
Water table
55cm
Forest
19%
Crops
17%
Urban
2%
Protected
7%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)