HydroBASINS lev08 watershed · #4080049690
Bassin de waterway
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 7 administrative regions : Koralai Pattu (Valachchenai), Koralai Pattu North, Koralai Pattu West (Oddamavadi), Muttur, Seruvila +2
Sub-basin area
1 007,3km²
Upstream area
1 007,3km²
Discharge
3,27m³/s
Mean elev.
17m
Administrative coverage
7 dept-equivalent regions (GADM L2)
- 488.1 km²48.7% of basin
- 195.4 km²19.5% of basin
- 126.1 km²12.6% of basin
- 90.3 km²9.0% of basin
- 45.5 km²4.5% of basin
- 3.5 km²0.3% of basin
- 0.9 km²0.1% of basin
10 intersecting protected areas
Trikonamadu
IUCN IVNature Reserve
182.57 km² overlap
Pannichankarathi F.R
IUCN IbReserved Forest
93.03 km² overlap
Seruvila - Allai
IUCN IVSanctuary
82.47 km² overlap
Kathiraweli F.R
IUCN IbReserved Forest
77.61 km² overlap
Koralai
IUCN IbReserved Forest
46.42 km² overlap
Somawatiya Chaithya
IUCN IINational Park
45.30 km² overlap
Vappiah Verugal
IUCN IbReserved Forest
20.41 km² overlap
Mahaweli
IUCN IbReserved Forest
16.37 km² overlap
Vakaneri
IUCN IbReserved Forest
11.55 km² overlap
1 more protected areassorted by overlap area
Kayankerny MSAN
IUCN IVSanctuary
7.30 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
162 distinct species · 487 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 waterway : 27 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 28 interactions GloBI sur 3 types (connectance 5.6%, 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°
27,6°C
Annual rain
1 691mm
Moisture idx (CMI)
0,15
Runoff
644mm/an
PET
1 433mm
AET
987mm
Mean slope
0,4°
Water table
36cm
Forest
21%
Crops
12%
Urban
0%
Protected
41%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)