HydroBASINS lev08 watershed · #4081155570
Bassin de Kal Aru
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 5 administrative regions : Kebithigollewa, Medawachchiya, Vavuniya, Vavuniya South, Vengalacheddiculam
Sub-basin area
642,3km²
Upstream area
642,3km²
Discharge
6,71m³/s
Mean elev.
86m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- 218.5 km²34.2% of basin
- VengalacheddiculamVavuniya · Sri Lanka202.9 km²31.7% of basin
- 196.0 km²30.6% of basin
- Vavuniya SouthVavuniya · Sri Lanka19.1 km²3.0% of basin
- 3.2 km²0.5% of basin
9 intersecting protected areas
Paddawiya
IUCN IbReserved Forest
20.24 km² overlap
Kurukkalputukulam
IUCN IbReserved Forest
17.23 km² overlap
Irasenthirankulam
IUCN IbReserved Forest
13.81 km² overlap
Karunkaikulam
IUCN IbReserved Forest
12.35 km² overlap
Puvarasankulam
IUCN IbReserved Forest
7.43 km² overlap
Isenbessagala
IUCN IbReserved Forest
5.30 km² overlap
Periyachipplkulam
IUCN IbReserved Forest
4.21 km² overlap
Hinna Forest
IUCN IbReserved Forest
2.07 km² overlap
Wedakanda
IUCN IbReserved Forest
0.12 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
178 distinct species · 864 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 31 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 Kal Aru : 25 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 35 interactions GloBI sur 3 types (connectance 7.5%, filtre Serrano α=0.2). 6 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°
27,4°C
Annual rain
1 388mm
Moisture idx (CMI)
-0,13
Runoff
368mm/an
PET
1 594mm
AET
1 008mm
Mean slope
0,7°
Water table
55cm
Forest
25%
Crops
9%
Urban
2%
Protected
6%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)