HydroBASINS lev08 watershed · #2080286600
Bassin de Большой Удрай
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 5 administrative regions : Loknyanskiy rayon, Nevel'skiy rayon, Novosokol'nicheskiy rayon, Pustoshkinskiy rayon, Velikolukskiy rayon
Sub-basin area
1 301,8km²
Upstream area
1 301,9km²
Discharge
10,78m³/s
Mean elev.
149m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
5 dept-equivalent regions (GADM L2)
- Novosokol'nicheskiy rayonPskov · Russia931.4 km²71.2% of basin
- Velikolukskiy rayonPskov · Russia269.2 km²20.6% of basin
- Loknyanskiy rayonPskov · Russia50.9 km²3.9% of basin
- Pustoshkinskiy rayonPskov · Russia46.7 km²3.6% of basin
- Nevel'skiy rayonPskov · Russia9.8 km²0.8% of basin
2 intersecting protected areas
Velikolukskij
IUCN IVState Natural Zoological Zakaznik
92.31 km² overlap
Nevel`skij
IUCN IVState Natural Zoological Zakaznik
4.99 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
198 distinct species · 400 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 Большой Удрай : 25 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 64 interactions GloBI sur 5 types (connectance 10.2%, filtre Serrano α=0.2). 11 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°
4,7°C
Annual rain
626mm
Moisture idx (CMI)
-0,03
Runoff
261mm/an
PET
645mm
AET
488mm
Mean slope
1,1°
Water table
85cm
Forest
49%
Crops
29%
Urban
1%
Protected
2%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)