HydroBASINS lev08 watershed · #4081157450
Bassin de Deduru 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 15 administrative regions : Ganewatta, Harispattuwa, Hatharaliyadda, Ibbagamuwa, Kurunegala +10
Sub-basin area
615,8km²
Upstream area
615,9km²
Discharge
15,26m³/s
Mean elev.
230m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
15 dept-equivalent regions (GADM L2)
- 211.0 km²34.4% of basin
- MawathagamaKurunegala · Sri Lanka76.0 km²12.4% of basin
- IbbagamuwaKurunegala · Sri Lanka72.6 km²11.8% of basin
- 64.1 km²10.4% of basin
- 41.5 km²6.8% of basin
- KurunegalaKurunegala · Sri Lanka39.8 km²6.5% of basin
- MallawapitiyaKurunegala · Sri Lanka35.6 km²5.8% of basin
- 26.5 km²4.3% of basin
7 moreFull L2 list
- Wariyapola22.8 km² · 3.7%
- Yatawatta16.0 km² · 2.6%
- Ukuwela3.3 km² · 0.5%
- Harispattuwa1.6 km² · 0.3%
- Maspotha1.4 km² · 0.2%
- Hatharaliyadda0.9 km² · 0.1%
- Pallepola0.3 km² · 0.0%
20 intersecting protected areas
Dolukanda
IUCN IaConservation Forest
5.62 km² overlap
Kimbulwana Oya
IUCN IVSanctuary
5.37 km² overlap
Yakdessagalakana
IUCN IbReserved Forest
3.19 km² overlap
Nawagalakanda
IUCN IbReserved Forest
2.75 km² overlap
Kiribamunakanda
IUCN IaConservation Forest
2.54 km² overlap
Badagamuwa
IUCN IaConservation Forest
2.41 km² overlap
Gorakadola
IUCN IbReserved Forest
2.02 km² overlap
Dodamgaslanda kirindigolla
IUCN IbReserved Forest
1.49 km² overlap
Peddawakanda
IUCN IbReserved Forest
1.47 km² overlap
11 more protected areassorted by overlap area
Weudamukalana
IUCN IbReserved Forest
1.45 km² overlap
Welikanda
IUCN IbReserved Forest
1.12 km² overlap
Dodan,6 kalugalkanda
IUCN IbReserved Forest
0.97 km² overlap
Huruggomuwa Kanda 2
IUCN IaConservation Forest
0.73 km² overlap
Handurukanda
IUCN IaConservation Forest
0.73 km² overlap
Kanugolla
IUCN IbReserved Forest
0.45 km² overlap
Dodangaslanda 5
IUCN IbReserved Forest
0.42 km² overlap
Ambokka kanda
IUCN IbReserved Forest
0.39 km² overlap
Mepitiyakanda Udattapola
IUCN IbReserved Forest
0.20 km² overlap
Galwatikanda
IUCN IbReserved Forest
0.16 km² overlap
Palukopiwatta
IUCN IbReserved Forest
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
771 distinct species · 12 906 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Deduru Oya : 25 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 19 interactions GloBI sur 4 types (connectance 5.0%, filtre Serrano α=0.2). 3 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°
26,4°C
Annual rain
1 903mm
Moisture idx (CMI)
0,16
Runoff
796mm/an
PET
1 595mm
AET
1 370mm
Mean slope
6,9°
Water table
300cm
Forest
13%
Crops
51%
Urban
45%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)