HydroBASINS lev08 watershed · #4081152130
Bassin de Varaha Nadhi
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 3 administrative regions : Dindigul, Madurai, Theni
Sub-basin area
969,4km²
Upstream area
3 131,7km²
Discharge
31,65m³/s
Mean elev.
536m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Moola Vaigai805 km²
- Bassin de Suruliar15 km²
3 dept-equivalent regions (GADM L2)
- 650.6 km²67.4% of basin
- Dindigul292.2 km²30.3% of basin
- Madurai22.6 km²2.3% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
1 361 distinct species · 42 187 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 34 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 Varaha Nadhi : 29 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 33 interactions GloBI sur 3 types (connectance 5.9%, 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°
25,9°C
Annual rain
933mm
Moisture idx (CMI)
-0,41
Runoff
279mm/an
PET
1 609mm
AET
745mm
Mean slope
8,6°
Water table
385cm
Forest
37%
Crops
55%
Urban
8%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)