HydroBASINS lev08 watershed · #7080720540
Bassin de Nolan River
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 2 administrative regions : Hill, Johnson
Sub-basin area
816,3km²
Upstream area
816,3km²
Discharge
4,03m³/s
Mean elev.
246m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- Johnson633.9 km²77.7% of basin
- Hill181.9 km²22.3% of basin
1 intersecting protected areas
Vivian Malone
IUCN VPreserve
0.59 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 274 distinct species · 66 718 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 39 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 Nolan River : 30 espèces reliées par 95 interactions GloBI sur 4 types (connectance 12.8%, 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°
18,5°C
Annual rain
850mm
Moisture idx (CMI)
-0,42
Runoff
156mm/an
PET
1 470mm
AET
719mm
Mean slope
1,0°
Water table
151cm
Forest
7%
Crops
40%
Urban
5%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)