HydroBASINS lev08 watershed · #2080383180
Bassin de Большой Иргиз
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 : Balakovskiy rayon, Ershovskiy rayon, Krasnopartizanskiy rayon, Pugachevskiy rayon
Sub-basin area
803,4km²
Upstream area
20 461,6km²
Discharge
51,32m³/s
Mean elev.
44m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Сакма552 km²
- Bassin de Большой Иргиз244 km²
4 dept-equivalent regions (GADM L2)
- 345.7 km²42.9% of basin
- 179.5 km²22.3% of basin
- 160.8 km²19.9% of basin
- 120.5 km²14.9% of basin
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
148 distinct species · 196 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Большой Иргиз : 27 espèces dont 3 patrimoniales (LR IUCN CR/EN/VU) reliées par 76 interactions GloBI sur 2 types (connectance 12.8%, filtre Serrano α=0.2). 8 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°
5,8°C
Annual rain
463mm
Moisture idx (CMI)
-0,42
Runoff
91mm/an
PET
800mm
AET
396mm
Mean slope
0,5°
Water table
152cm
Forest
0%
Crops
69%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)