HydroBASINS lev08 watershed · #7080389000
Bassin de Rivière de l'Achigan
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 8 administrative regions : L'Assomption, La Rivière-du-Nord, Les Moulins, Les Pays-d'en-Haut, Matawinie +3
Sub-basin area
642,5km²
Upstream area
642,6km²
Discharge
12,02m³/s
Mean elev.
159m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
8 dept-equivalent regions (GADM L2)
- 354.1 km²55.0% of basin
- 209.1 km²32.5% of basin
- 38.7 km²6.0% of basin
- 25.7 km²4.0% of basin
- 6.5 km²1.0% of basin
- 5.4 km²0.8% of basin
- 4.2 km²0.7% of basin
- 0.4 km²0.1% of basin
5 intersecting protected areas
Proposed biodiversity reserve
17.05 km² overlap
Racines Nature Reserve
IUCN Not ReportedRecognized nature reserve
0.81 km² overlap
Albert, lac Heronry
IUCN VIHeronry
0.66 km² overlap
Land reserved for protected area
0.51 km² overlap
Boisé-des-Terres-Noires Natural reserve
IUCN Not ReportedRecognized nature reserve
0.37 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 726 distinct species · 106 406 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 Rivière de l'Achigan : 25 espèces reliées par 77 interactions GloBI sur 4 types (connectance 12.9%, filtre Serrano α=0.2). 10 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
1 003mm
Moisture idx (CMI)
0,19
Runoff
588mm/an
PET
808mm
AET
643mm
Mean slope
2,4°
Water table
69cm
Forest
63%
Crops
22%
Urban
4%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)