HydroBASINS lev08 watershed · #4081158940
Bassin de Delawala 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 9 administrative regions : Ayagama, Elapatha, Godakawela, Kahawatta, Kalawana +4
Sub-basin area
269,6km²
Upstream area
269,6km²
Discharge
12,94m³/s
Mean elev.
314m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
9 dept-equivalent regions (GADM L2)
- NivithigalaRatnapura · Sri Lanka108.9 km²40.6% of basin
- 68.9 km²25.7% of basin
- 54.3 km²20.2% of basin
- GodakawelaRatnapura · Sri Lanka25.7 km²9.6% of basin
- PelmadullaRatnapura · Sri Lanka5.4 km²2.0% of basin
- 2.9 km²1.1% of basin
- 1.8 km²0.7% of basin
- 0.4 km²0.2% of basin
1 moreFull L2 list
- Kolonna0.1 km² · 0.0%
6 intersecting protected areas
Madampe
IUCN IbReserved Forest
2.49 km² overlap
Nahitimukalana
IUCN IbReserved Forest
1.86 km² overlap
Iriyagahahena
IUCN IbReserved Forest
1.73 km² overlap
Muwagankanda
IUCN IbReserved Forest
1.53 km² overlap
Pannila
IUCN IbReserved Forest
1.15 km² overlap
Walankanda
IUCN IbReserved Forest
0.08 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
341 distinct species · 4 336 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 20 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 Delawala Oya : 15 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 19 interactions GloBI sur 3 types (connectance 10.0%, filtre Serrano α=0.2). 5 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°
25,5°C
Annual rain
3 556mm
Moisture idx (CMI)
0,58
Runoff
1 408mm/an
PET
1 493mm
AET
1 489mm
Mean slope
11,4°
Water table
445cm
Forest
40%
Crops
49%
Urban
35%
Protected
3%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)