HydroBASINS lev08 watershed · #7080057020
Bassin de Koksilah 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 : Capital, Cowichan Valley, Nanaimo
Sub-basin area
1 247km²
Upstream area
1 247km²
Discharge
65,6m³/s
Mean elev.
443m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 1215.3 km²97.2% of basin
- 34.9 km²2.8% of basin
- Nanaimo0.6 km²0.0% of basin
30 intersecting protected areas
COWICHAN RIVER PARK
IUCN IIA - Park
14.08 km² overlap
Greater Victoria Water Supply Area
IUCN Not ApplicableWater Supply Area
4.47 km² overlap
KOKSILAH RIVER PARK
IUCN IIA - Park
2.15 km² overlap
Cowichan River III
IUCN IVPrivately Owned Conservation Area
2.04 km² overlap
Wildlife Management Area
1.55 km² overlap
HWSALU-UTSUM PARK
IUCN IIA - Park
1.43 km² overlap
GORDON BAY PARK
IUCN Not ReportedA - Park
1.04 km² overlap
Wildlife Habitat Areas
IUCN Not ApplicableWildlife Habitat Areas
1.02 km² overlap
Somenos Lakebed
IUCN IVPrivately Owned Conservation Area
0.95 km² overlap
21 more protected areassorted by overlap area
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.95 km² overlap
Old Growth Management Areas (Mapped Legal)
IUCN Not ApplicableOld Growth Management Areas (Mapped Legal)
0.74 km² overlap
Privately Owned Conservation Area
0.38 km² overlap
Somenos Flats - 1989
IUCN IVPrivately Owned Conservation Area
0.27 km² overlap
Privately Protected Area
0.26 km² overlap
Chase Woods
IUCN IVPrivately Owned Conservation Area
0.26 km² overlap
Cowichan Garry Oak Preserve
IUCN IVPrivately Owned Conservation Area
0.23 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.22 km² overlap
Somenos Flats - 1976
IUCN IVPrivately Owned Conservation Area
0.21 km² overlap
Ecological Reserve
0.18 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.16 km² overlap
Privately Owned Conservation Area
0.15 km² overlap
Privately Owned Conservation Area
0.14 km² overlap
Privately Owned Conservation Area
0.13 km² overlap
Privately Protected Area
0.11 km² overlap
Privately Protected Area
0.11 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.11 km² overlap
Privately Owned Conservation Area
0.08 km² overlap
Ecological Reserve
0.07 km² overlap
DUC Fee Simple Lands
IUCN IVOwnership by Environmental Non-Governmental Organization
0.07 km² overlap
Privately Owned Conservation Area
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 913 distinct species · 447 313 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Koksilah River : 26 espèces reliées par 97 interactions GloBI sur 4 types (connectance 11.8%, filtre Serrano α=0.2). 15 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°
7,7°C
Annual rain
1 736mm
Moisture idx (CMI)
0,57
Runoff
1 567mm/an
PET
726mm
AET
555mm
Mean slope
13,3°
Water table
619cm
Forest
86%
Crops
3%
Urban
2%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)