HydroBASINS lev08 watershed · #5080071280
Bassin de Colah Creek
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 : Hornsby, The Hills
Sub-basin area
139,3km²
Upstream area
139,3km²
Discharge
1,45m³/s
Mean elev.
147m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 129.7 km²93.2% of basin
- 0.5 km²0.3% of basin
2 intersecting protected areas
Marramarra
IUCN IINational Park
71.37 km² overlap
Muogamarra
IUCN IaNature Reserve
0.17 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
2 730 distinct species · 48 260 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 32 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 Colah Creek : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 59 interactions GloBI sur 5 types (connectance 9.9%, filtre Serrano α=0.2). 13 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°
16,7°C
Annual rain
1 166mm
Moisture idx (CMI)
-0,06
Runoff
333mm/an
PET
1 238mm
AET
961mm
Mean slope
9,7°
Water table
417cm
Forest
100%
Crops
0%
Urban
0%
Protected
51%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)