HydroBASINS lev08 watershed · #4081159050
Bassin de Kuda Gaga
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 16 administrative regions : Agalawatta, Ayagama, Bulathsinhala, Dodangoda, Godakawela +11
Sub-basin area
914,9km²
Upstream area
914,9km²
Discharge
48,36m³/s
Mean elev.
273m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
16 dept-equivalent regions (GADM L2)
- 339.4 km²37.3% of basin
- PalindanuwaraKalutara · Sri Lanka266.4 km²29.2% of basin
- BulathsinhalaKalutara · Sri Lanka157.8 km²17.3% of basin
- AgalawattaKalutara · Sri Lanka52.5 km²5.8% of basin
- 38.8 km²4.3% of basin
- WalallawitaKalutara · Sri Lanka29.5 km²3.2% of basin
- NivithigalaRatnapura · Sri Lanka11.7 km²1.3% of basin
- MadurawalaKalutara · Sri Lanka11.2 km²1.2% of basin
15 intersecting protected areas
National Heritage Wilderness Area
39.79 km² overlap
Sinharaja Forest Reserve
IUCN Not ApplicableWorld Heritage Site (natural or mixed)
31.96 km² overlap
Sinharaja Forest Reserve
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
31.96 km² overlap
Walankanda
IUCN IbReserved Forest
9.31 km² overlap
Sinharaja
IUCN Not ReportedReserved Forest
7.18 km² overlap
Heycock
IUCN IbReserved Forest
3.23 km² overlap
Mahagama
IUCN IaConservation Forest
1.55 km² overlap
Kudaganga
IUCN IbReserved Forest
1.40 km² overlap
Auwegalkanda
IUCN IaConservation Forest
1.14 km² overlap
6 more protected areassorted by overlap area
Tunkadullanda
IUCN IaConservation Forest
0.94 km² overlap
Waratalgoda Kitulutura
IUCN IbReserved Forest
0.56 km² overlap
Kudumirishena
IUCN IaConservation Forest
0.50 km² overlap
Auwegalakanda
IUCN IbReserved Forest
0.32 km² overlap
Pannila
IUCN IbReserved Forest
0.21 km² overlap
Walauwewatta-Wathurana EPA
IUCN IaEnvironmental Protection Area (EPA)
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 332 distinct species · 151 326 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 29 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 Kuda Gaga : 26 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 25 interactions GloBI sur 3 types (connectance 6.2%, 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°
25,6°C
Annual rain
3 777mm
Moisture idx (CMI)
0,61
Runoff
1 477mm/an
PET
1 448mm
AET
1 443mm
Mean slope
10,3°
Water table
377cm
Forest
53%
Crops
39%
Urban
10%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)