HydroBASINS lev08 watershed · #4081141140
Bassin de Ponnaiyar
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 4 administrative regions : Dharmapuri, Krishnagiri, Tiruvannamalai, Vellore
Sub-basin area
358,7km²
Upstream area
10 310,1km²
Discharge
26,08m³/s
Mean elev.
394m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Vaniyaru994 km²
- Bassin de Thenpennai River6 km²
4 dept-equivalent regions (GADM L2)
- Dharmapuri159.8 km²44.7% of basin
- Tiruvannamalai80.8 km²22.6% of basin
- Vellore60.3 km²16.9% of basin
- Krishnagiri56.4 km²15.8% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
135 distinct species · 660 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 49 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 Ponnaiyar : 43 espèces dont 4 patrimoniales (LR IUCN CR/EN/VU) reliées par 45 interactions GloBI sur 3 types (connectance 3.8%, 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°
27,1°C
Annual rain
922mm
Moisture idx (CMI)
-0,48
Runoff
154mm/an
PET
1 773mm
AET
779mm
Mean slope
4,8°
Water table
330cm
Forest
57%
Crops
42%
Urban
7%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)