HydroBASINS lev08 watershed · #4080049850
Bassin de Kumbukkan 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 17 administrative regions : Addalachchenai, Akkaraipattu, Alayadiwembu, Badalkumbura, Buttala +12
Sub-basin area
3 991,8km²
Upstream area
3 991,8km²
Discharge
0,45m³/s
Mean elev.
105m
Administrative coverage
17 dept-equivalent regions (GADM L2)
- 962.0 km²24.2% of basin
- SiyambalanduwaMoneragala · Sri Lanka948.1 km²23.9% of basin
- MoneragalaMoneragala · Sri Lanka293.0 km²7.4% of basin
- 272.5 km²6.9% of basin
- ThissamaharamaHambantota · Sri Lanka271.7 km²6.8% of basin
- 223.4 km²5.6% of basin
- 180.9 km²4.6% of basin
- ThirukkovilAmpara · Sri Lanka176.6 km²4.4% of basin
9 moreFull L2 list
- Damana142.8 km² · 3.6%
- Katharagama114.2 km² · 2.9%
- Alayadiwembu86.6 km² · 2.2%
- Badalkumbura83.1 km² · 2.1%
- Lunugala62.1 km² · 1.6%
- Medagama37.7 km² · 0.9%
- Akkaraipattu35.0 km² · 0.9%
- Passara31.3 km² · 0.8%
- Addalachchenai2.4 km² · 0.1%
24 intersecting protected areas
Bakmitiyawa Thibirigolla
IUCN IbReserved Forest
440.26 km² overlap
Kumbukkan
IUCN IaConservation Forest
383.29 km² overlap
Kumana NP
IUCN IINational Park
357.83 km² overlap
Yala NP
IUCN IINational Park
301.68 km² overlap
Wattegama Kabilitta
IUCN IbReserved Forest
289.26 km² overlap
Yala
IUCN IaStrict Nature Reserve
193.51 km² overlap
Kudumbigala - Panama
IUCN IVSanctuary
65.41 km² overlap
Maragala EPA
IUCN VIEnvironmental Protection Area (EPA)
54.33 km² overlap
Lahugala
IUCN IINational Park
15.11 km² overlap
15 more protected areassorted by overlap area
Gal Oya Valley South - East
IUCN IVSanctuary
12.68 km² overlap
UlugalaMinepura
IUCN IbReserved Forest
9.50 km² overlap
Daragoda
IUCN IbReserved Forest
8.35 km² overlap
Budugallena
IUCN IbReserved Forest
6.31 km² overlap
Sanctuary
6.23 km² overlap
Sagamam
IUCN IVSanctuary
6.21 km² overlap
Suduwathura ara
IUCN IbReserved Forest
5.89 km² overlap
Maduhelakanda
IUCN IbReserved Forest
5.25 km² overlap
Weliihela
IUCN IbReserved Forest
3.07 km² overlap
Silbarakanda
IUCN IbReserved Forest
2.87 km² overlap
Namandiya
IUCN IbReserved Forest
2.85 km² overlap
Rilaolukanda
IUCN IbReserved Forest
2.77 km² overlap
Medawelagama
IUCN IbReserved Forest
2.48 km² overlap
Pahatarawa
IUCN IbReserved Forest
1.38 km² overlap
Bakigahawela
IUCN IbReserved Forest
0.87 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
719 distinct species · 11 292 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Kumbukkan Oya : 35 espèces dont 5 patrimoniales (LR IUCN CR/EN/VU) reliées par 34 interactions GloBI sur 4 types (connectance 4.6%, filtre Serrano α=0.2). 4 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°
26,6°C
Annual rain
1 540mm
Moisture idx (CMI)
0,03
Runoff
586mm/an
PET
1 478mm
AET
1 030mm
Mean slope
2,8°
Water table
145cm
Forest
59%
Crops
11%
Urban
2%
Protected
28%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)