HydroBASINS lev08 watershed · #4080049840
Bassin de Galoya
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 18 administrative regions : Addalachchenai, Akkaraipattu, Alayadiwembu, Ampara, Bibile +13
Sub-basin area
1 722,7km²
Upstream area
1 722,8km²
Discharge
37,09m³/s
Mean elev.
178m
Administrative coverage
18 dept-equivalent regions (GADM L2)
- 371.0 km²21.6% of basin
- 362.9 km²21.2% of basin
- 259.2 km²15.1% of basin
- 203.4 km²11.9% of basin
- SiyambalanduwaMoneragala · Sri Lanka126.5 km²7.4% of basin
- 110.9 km²6.5% of basin
- 62.8 km²3.7% of basin
- 62.5 km²3.6% of basin
10 moreFull L2 list
- Addalachchenai50.6 km² · 3.0%
- Akkaraipattu40.6 km² · 2.4%
- Samanthurai31.1 km² · 1.8%
- Lunugala20.4 km² · 1.2%
- Ninthavur5.5 km² · 0.3%
- Rideemaliyadda3.5 km² · 0.2%
- Meegahakivula2.7 km² · 0.2%
- Padiyathalawa1.4 km² · 0.1%
- Moneragala0.0 km² · 0.0%
- Alayadiwembu0.0 km² · 0.0%
10 intersecting protected areas
Gal Oya
IUCN IINational Park
332.33 km² overlap
Gal Oya Valley South - East
IUCN IVSanctuary
183.26 km² overlap
Senanayaka Samudra
IUCN IVSanctuary
78.92 km² overlap
Gal Oya Valley North - East
IUCN IVSanctuary
35.29 km² overlap
Bakmitiyawa Thibirigolla
IUCN IbReserved Forest
31.16 km² overlap
Nelugala
IUCN Not ReportedJungle Corridor
23.22 km² overlap
Nuwaragala
IUCN IbReserved Forest
13.83 km² overlap
Budhangala
IUCN IVSanctuary
3.92 km² overlap
Bakigahawela
IUCN IbReserved Forest
1.15 km² overlap
1 more protected areassorted by overlap area
Rilaolukanda
IUCN IbReserved Forest
1.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
649 distinct species · 20 696 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 21 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 Galoya : 19 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 14 interactions GloBI sur 3 types (connectance 6.7%, 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°
26,3°C
Annual rain
1 887mm
Moisture idx (CMI)
0,20
Runoff
723mm/an
PET
1 502mm
AET
1 133mm
Mean slope
5,1°
Water table
258cm
Forest
52%
Crops
15%
Urban
4%
Protected
38%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)