HydroBASINS lev08 watershed · #4080049090
Bassin de Ma 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 30 administrative regions : Alawwa, Aranayaka, Bulathkohupitiya, Dankotuwa, Divulapitiya +25
Sub-basin area
1 516,3km²
Upstream area
1 516,3km²
Discharge
42,95m³/s
Mean elev.
184m
Administrative coverage
30 dept-equivalent regions (GADM L2)
- DivulapitiyaGampaha · Sri Lanka139.6 km²9.2% of basin
- RambukkanaKegalle · Sri Lanka132.5 km²8.8% of basin
- 131.7 km²8.7% of basin
- 116.6 km²7.7% of basin
- 106.8 km²7.1% of basin
- WarakapolaKegalle · Sri Lanka106.5 km²7.1% of basin
- 102.3 km²6.8% of basin
- 94.4 km²6.3% of basin
22 moreFull L2 list
- Aranayaka88.4 km² · 5.9%
- Polgahawela86.9 km² · 5.8%
- Hatharaliyadda63.1 km² · 4.2%
- Ganga Ihala Korale54.9 km² · 3.6%
- Galigamuwa54.1 km² · 3.6%
- Kegalle51.1 km² · 3.4%
- Mawathagama30.3 km² · 2.0%
- Katana27.2 km² · 1.8%
- Dankotuwa21.9 km² · 1.4%
- Udunuwara19.0 km² · 1.3%
- Weerambugedara18.3 km² · 1.2%
- Mallawapitiya16.6 km² · 1.1%
- Kuliyapitiya East16.0 km² · 1.1%
- Yatinuwara14.4 km² · 1.0%
- Thumpane7.5 km² · 0.5%
- Wennappuwa3.0 km² · 0.2%
- Udapalatha2.6 km² · 0.2%
- Negombo2.1 km² · 0.1%
- Harispattuwa0.8 km² · 0.1%
- Kurunegala0.7 km² · 0.0%
- Ruwanwella0.3 km² · 0.0%
- Bulathkohupitiya0.0 km² · 0.0%
30 intersecting protected areas
Kegalle (Kurulu Kele)
IUCN IVSanctuary
4.64 km² overlap
Dambulla
IUCN IbReserved Forest
1.93 km² overlap
Bajjangoda
IUCN IbReserved Forest
1.71 km² overlap
Gangekumbura
IUCN IbReserved Forest
1.70 km² overlap
Meeambakanda
IUCN IbReserved Forest
1.60 km² overlap
Polkatukanda
IUCN IbReserved Forest
1.55 km² overlap
Dikkele
IUCN IbReserved Forest
1.46 km² overlap
Maragalkanda
IUCN Not ReportedForest Reserve
1.26 km² overlap
Dewalakanda
IUCN IbReserved Forest
1.11 km² overlap
21 more protected areassorted by overlap area
Dawatagolla
IUCN IbReserved Forest
1.07 km² overlap
Raxawa
IUCN IbReserved Forest
1.06 km² overlap
Viharakele2
IUCN IbReserved Forest
0.89 km² overlap
Naranbedda
IUCN IbReserved Forest
0.87 km² overlap
Siyambalagamuwa
IUCN IbReserved Forest
0.86 km² overlap
Kendahena
IUCN IbReserved Forest
0.77 km² overlap
Polgolla
IUCN Not ReportedForest Reserve
0.68 km² overlap
Welikumbura
IUCN IbReserved Forest
0.65 km² overlap
Gondenikanda
IUCN IbReserved Forest
0.61 km² overlap
Halagiriya
IUCN IbReserved Forest
0.59 km² overlap
Narangamuwakanda
IUCN IbReserved Forest
0.52 km² overlap
Badapeliyagoda
IUCN IbReserved Forest
0.49 km² overlap
Polgahawela
IUCN IbReserved Forest
0.47 km² overlap
Sinharajagama
IUCN IbReserved Forest
0.40 km² overlap
Kotagama
IUCN IbReserved Forest
0.39 km² overlap
Huruggomuwa Kanda
IUCN IaConservation Forest
0.31 km² overlap
Pugalkanda
IUCN IbReserved Forest
0.17 km² overlap
Balana lingamuwatta
IUCN IbReserved Forest
0.15 km² overlap
Dikkele2 (wawlkele)
IUCN IbReserved Forest
0.13 km² overlap
Hingurugala
IUCN IbReserved Forest
0.13 km² overlap
Kahandawala Uppanduwa
IUCN IbReserved Forest
0.13 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 622 distinct species · 13 334 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 36 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 Ma Oya : 34 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 27 interactions GloBI sur 4 types (connectance 4.3%, 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°
26,6°C
Annual rain
2 341mm
Moisture idx (CMI)
0,32
Runoff
938mm/an
PET
1 564mm
AET
1 442mm
Mean slope
6,7°
Water table
259cm
Forest
17%
Crops
61%
Urban
60%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)