HydroBASINS lev08 watershed · #4080050080
Bassin de Walawe 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 25 administrative regions : Ambagamuwa, Ambalanthota, Angunakolapelessa, Balangoda, Bandarawela +20
Sub-basin area
2 513km²
Upstream area
2 513km²
Discharge
84,8m³/s
Mean elev.
348m
Administrative coverage
25 dept-equivalent regions (GADM L2)
- ThanamalvilaMoneragala · Sri Lanka428.0 km²17.1% of basin
- EmbilipitiyaRatnapura · Sri Lanka376.4 km²15.0% of basin
- 255.4 km²10.2% of basin
- 236.8 km²9.5% of basin
- HildummullaBadulla · Sri Lanka221.8 km²8.9% of basin
- WeligepolaRatnapura · Sri Lanka191.2 km²7.6% of basin
- SevanagalaMoneragala · Sri Lanka181.0 km²7.2% of basin
- SooriyawewaHambantota · Sri Lanka141.6 km²5.7% of basin
17 moreFull L2 list
- Kolonna137.0 km² · 5.5%
- Ambalanthota110.4 km² · 4.4%
- Godakawela93.3 km² · 3.7%
- Hambantota52.5 km² · 2.1%
- Haputale21.1 km² · 0.8%
- Ratnapura15.9 km² · 0.6%
- Nuwara Eliya15.2 km² · 0.6%
- Ambagamuwa9.0 km² · 0.4%
- Katuwana5.6 km² · 0.2%
- Kalawana2.8 km² · 0.1%
- Welimada2.4 km² · 0.1%
- Wellawaya1.7 km² · 0.1%
- Opanayaka1.5 km² · 0.1%
- Bandarawela0.8 km² · 0.0%
- Angunakolapelessa0.5 km² · 0.0%
- Kotapola0.1 km² · 0.0%
- Pasgoda0.0 km² · 0.0%
25 intersecting protected areas
Uda Walawe
IUCN IINational Park
307.86 km² overlap
Central Highlands of Sri Lanka
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
80.01 km² overlap
Bogahapelessa
IUCN IbReserved Forest
61.97 km² overlap
Ilukpelessa
IUCN IbReserved Forest
39.46 km² overlap
Peak Wilderness NR
IUCN IaNature Reserve
31.71 km² overlap
Rajawaka
IUCN IbReserved Forest
26.16 km² overlap
Dahiyagala
IUCN IVSanctuary
26.01 km² overlap
Madunagala
IUCN IVSanctuary
17.93 km² overlap
WaleweNimmna
IUCN IaConservation Forest
17.26 km² overlap
16 more protected areassorted by overlap area
Horton Plains
IUCN IINational Park
14.92 km² overlap
Wetahirakanda
IUCN IVNature Reserve
9.45 km² overlap
Welegama
IUCN IbReserved Forest
8.37 km² overlap
MorahelaWH
IUCN IaConservation Forest
5.46 km² overlap
Kelawalagala
IUCN IbReserved Forest
3.47 km² overlap
Morahela
IUCN IbReserved Forest
2.96 km² overlap
Bogandana
IUCN IbReserved Forest
2.90 km² overlap
Thotupalakanda
IUCN IbReserved Forest
2.72 km² overlap
Peak Wilderness
IUCN Not ReportedConservation Forest
2.50 km² overlap
Kumburugamuwa
IUCN IbReserved Forest
1.01 km² overlap
Tangamale
IUCN IVSanctuary
0.42 km² overlap
Middeniya-Kudagoda
IUCN IbReserved Forest
0.22 km² overlap
Godawaya
IUCN IVSanctuary
0.18 km² overlap
National Heritage Wilderness Area
0.08 km² overlap
Meddeniya
IUCN IbReserved Forest
0.01 km² overlap
Panilkanda
IUCN IbReserved Forest
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 574 distinct species · 147 577 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 25 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 Walawe River : 23 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 23 interactions GloBI sur 3 types (connectance 7.7%, filtre Serrano α=0.2). 2 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°
25,2°C
Annual rain
1 882mm
Moisture idx (CMI)
0,16
Runoff
1 061mm/an
PET
1 459mm
AET
1 255mm
Mean slope
6,7°
Water table
239cm
Forest
43%
Crops
37%
Urban
13%
Protected
19%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)