HydroBASINS lev08 watershed · #4080049050
Bassin de Kelani Ganga
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 38 administrative regions : Ambagamuwa, Aranayaka, Attanagalla, Biyagama, Bulathkohupitiya +33
Sub-basin area
2 325,3km²
Upstream area
2 325,3km²
Discharge
102,26m³/s
Mean elev.
373m
Administrative coverage
38 dept-equivalent regions (GADM L2)
- AmbagamuwaNuwara Eliya · Sri Lanka411.5 km²17.8% of basin
- DeraniyagalaKegalle · Sri Lanka216.0 km²9.3% of basin
- 203.5 km²8.8% of basin
- 174.7 km²7.5% of basin
- YatiyanthotaKegalle · Sri Lanka164.4 km²7.1% of basin
- 144.9 km²6.3% of basin
- BulathkohupitiyaKegalle · Sri Lanka120.8 km²5.2% of basin
- RuwanwellaKegalle · Sri Lanka101.2 km²4.4% of basin
30 moreFull L2 list
- Kaduwela91.2 km² · 3.9%
- Padukka83.6 km² · 3.6%
- Galigamuwa81.5 km² · 3.5%
- Biyagama62.0 km² · 2.7%
- Kegalle57.8 km² · 2.5%
- Warakapola55.1 km² · 2.4%
- Eheliyagoda53.7 km² · 2.3%
- Homagama51.9 km² · 2.2%
- Mahara49.2 km² · 2.1%
- Aranayaka31.7 km² · 1.4%
- Kolonnawa26.2 km² · 1.1%
- Kelaniya24.4 km² · 1.1%
- Maharagama19.7 km² · 0.9%
- Sri Jayawardanapura Kotte14.3 km² · 0.6%
- Wattala14.3 km² · 0.6%
- Thimbirigasyaya11.6 km² · 0.5%
- Horana11.0 km² · 0.5%
- Colombo9.6 km² · 0.4%
- Attanagalla7.9 km² · 0.3%
- Ja-Ela6.8 km² · 0.3%
- Kuruvita5.0 km² · 0.2%
- Nuwara Eliya3.1 km² · 0.1%
- Ganga Ihala Korale3.1 km² · 0.1%
- Gampaha1.8 km² · 0.1%
- Ratnapura1.2 km² · 0.1%
- Dehiwala-Mount Lavinia0.3 km² · 0.0%
- Pasbage Korale0.2 km² · 0.0%
- Imbulpe0.1 km² · 0.0%
- Ingiriya0.0 km² · 0.0%
- Kesbewa0.0 km² · 0.0%
30 intersecting protected areas
Central Highlands of Sri Lanka
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
73.11 km² overlap
Peak Wilderness NR
IUCN IaNature Reserve
39.32 km² overlap
Peak Wilderness
IUCN Not ReportedConservation Forest
35.09 km² overlap
Labugama Kalatuwawa
IUCN IbReserved Forest
18.57 km² overlap
Sri Pada
IUCN IaConservation Forest
9.80 km² overlap
Bellanwila - Attidiya
IUCN IVSanctuary
8.00 km² overlap
Kelani Valley
IUCN IbReserved Forest
6.26 km² overlap
Mitirigala
IUCN IbReserved Forest
5.00 km² overlap
Kananpella
IUCN IbReserved Forest
2.99 km² overlap
21 more protected areassorted by overlap area
Maniyangama Timbiripola
IUCN IbReserved Forest
2.12 km² overlap
Alapalawala
IUCN IbReserved Forest
1.82 km² overlap
Eluwana
IUCN Not ReportedForest Reserve
1.52 km² overlap
Lenagala
IUCN IbReserved Forest
1.38 km² overlap
Urakanda
IUCN IbReserved Forest
1.14 km² overlap
Miriyagalla
IUCN IbReserved Forest
1.05 km² overlap
Galamuduna
IUCN IaConservation Forest
0.97 km² overlap
Horton Plains
IUCN IINational Park
0.88 km² overlap
Thalangama EPA
IUCN IVEnvironmental Protection Area (EPA)
0.85 km² overlap
Welhella - Kategilla
IUCN IVSanctuary
0.59 km² overlap
Horagolla 2
IUCN IbReserved Forest
0.49 km² overlap
Handamunawa
IUCN IbReserved Forest
0.48 km² overlap
Aturupana
IUCN IbReserved Forest
0.48 km² overlap
Tarangala
IUCN Not ReportedForest Reserve
0.39 km² overlap
Naragahakanda
IUCN IbReserved Forest
0.34 km² overlap
Paradeniya
IUCN IbReserved Forest
0.31 km² overlap
Nissankayapalawa
IUCN IaConservation Forest
0.27 km² overlap
Lewala
IUCN IbReserved Forest
0.27 km² overlap
Kellie Group
IUCN IaConservation Forest
0.26 km² overlap
Alubodeni
IUCN IaConservation Forest
0.15 km² overlap
WaleweNimmna
IUCN IaConservation Forest
0.14 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 314 distinct species · 369 098 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 37 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 Kelani Ganga : 35 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 35 interactions GloBI sur 3 types (connectance 5.3%, 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
3 344mm
Moisture idx (CMI)
0,54
Runoff
1 234mm/an
PET
1 485mm
AET
1 439mm
Mean slope
9,4°
Water table
329cm
Forest
29%
Crops
51%
Urban
47%
Protected
5%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)