HydroBASINS lev08 watershed · #1081625140
Bassin de Udabis
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 across 2 countries : Karas, Namakwa, Siyanda
Sub-basin area
559,4km²
Upstream area
759 789,4km²
Discharge
435,84m³/s
Mean elev.
689m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Ham237 km²
- Bassin de Orange River2 km²
3 dept-equivalent regions (GADM L2)
- 421.8 km²75.5% of basin
- 118.0 km²21.1% of basin
- 18.8 km²3.4% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
216 distinct species · 339 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 38 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 Udabis : 30 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 42 interactions GloBI sur 4 types (connectance 5.7%, filtre Serrano α=0.2). 9 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°
20,6°C
Annual rain
118mm
Moisture idx (CMI)
-0,94
Runoff
5mm/an
PET
1 856mm
AET
97mm
Mean slope
2,3°
Water table
1 015cm
Forest
0%
Crops
0%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)