HydroBASINS lev08 watershed · #4080029250
Bassin de Vaigai
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 2 administrative regions : Ramanathapuram, Sivaganga
Sub-basin area
1 041km²
Upstream area
6 714,3km²
Discharge
22,52m³/s
Mean elev.
26m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de Periyar Main Canal1307 km²
- Bassin de Uppaaru762 km²
2 dept-equivalent regions (GADM L2)
- Ramanathapuram870.8 km²84.0% of basin
- Sivaganga165.5 km²16.0% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
241 distinct species · 6 192 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 Vaigai : 18 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 55 interactions GloBI sur 3 types (connectance 14.6%, filtre Serrano α=0.2). 10 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°
28,9°C
Annual rain
817mm
Moisture idx (CMI)
-0,49
Runoff
151mm/an
PET
1 591mm
AET
689mm
Mean slope
0,1°
Water table
12cm
Forest
9%
Crops
70%
Urban
12%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)