HydroBASINS lev08 watershed · #2080273480
Bassin de Tirza
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 : Cesis, Gulbene, Madona
Sub-basin area
653,7km²
Upstream area
653,8km²
Discharge
6,67m³/s
Mean elev.
163m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- 384.8 km²58.6% of basin
- 220.6 km²33.6% of basin
- 51.6 km²7.9% of basin
5 intersecting protected areas
Vijatas meži
IUCN IVNature Reserve
3.68 km² overlap
Audulītes staignāju meži
IUCN IVNature Reserve
0.44 km² overlap
Bērzu purvs
IUCN IVMicro-reserve
0.27 km² overlap
Bērzu purvs
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.27 km² overlap
Druvienas alejas
IUCN IIINature Monument
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
446 distinct species · 963 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 Tirza : 25 espèces reliées par 75 interactions GloBI sur 5 types (connectance 11.9%, 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°
4,9°C
Annual rain
682mm
Moisture idx (CMI)
0,13
Runoff
318mm/an
PET
595mm
AET
469mm
Mean slope
1,5°
Water table
122cm
Forest
49%
Crops
13%
Urban
0%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)