HydroBASINS lev08 watershed · #7080576220
Bassin de South Grand 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 3 administrative regions : Cass, Johnson, Miami
Sub-basin area
604,4km²
Upstream area
604,4km²
Discharge
5,49m³/s
Mean elev.
296m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
3 dept-equivalent regions (GADM L2)
- Cass524.2 km²86.7% of basin
- Miami67.8 km²11.2% of basin
- Johnson12.9 km²2.1% of basin
4 intersecting protected areas
Amarugia Highlands
IUCN VConservation Area
4.20 km² overlap
Reserve Program
0.35 km² overlap
Dorsett Hill Prairie
IUCN VConservation Area
0.31 km² overlap
Bittern Bottoms
IUCN VConservation Area
0.26 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
947 distinct species · 172 978 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 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 South Grand River : 23 espèces reliées par 72 interactions GloBI sur 3 types (connectance 13.6%, 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°
12,5°C
Annual rain
997mm
Moisture idx (CMI)
-0,13
Runoff
286mm/an
PET
1 144mm
AET
844mm
Mean slope
1,3°
Water table
96cm
Forest
11%
Crops
48%
Urban
4%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)