HydroBASINS lev08 watershed · #1080015280
Bassin de Diep 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 : Cape Winelands, City of Cape Town, West Coast
Sub-basin area
1 488,2km²
Upstream area
1 488,3km²
Discharge
13,26m³/s
Mean elev.
151m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- 669.7 km²45.0% of basin
- City of Cape Town653.1 km²43.9% of basin
- 164.8 km²11.1% of basin
13 intersecting protected areas
Riverlands Provincial Nature Reserve
IUCN Not ReportedNature Reserve
16.93 km² overlap
Rietvlei Nature Area
IUCN Not ReportedNature Reserve
3.60 km² overlap
Simson-Simons Nature Reserve
IUCN Not ReportedNature Reserve
3.12 km² overlap
Rhenosterkop Nature Reserve
IUCN Not ReportedNature Reserve
2.39 km² overlap
Paarl Mountain Nature Reserve
IUCN Not ReportedNature Reserve
1.72 km² overlap
Hottentots-Holland Mountain Catchment Area
IUCN Not ReportedMountain Catchment Area
0.76 km² overlap
Joostenberg Private Nature Reserve
IUCN Not ReportedNature Reserve
0.59 km² overlap
Kalbaskraal Nature Reserve
IUCN Not ReportedNature Reserve
0.37 km² overlap
Uitkamp Wetland Nature Reserve
IUCN Not ReportedNature Reserve
0.32 km² overlap
4 more protected areassorted by overlap area
J. N. Briers-Louw Nature Reserve
IUCN Not ReportedNature Reserve
0.29 km² overlap
Bothasig Nature Reserve
IUCN Not ReportedNature Reserve
0.06 km² overlap
Han's Gift Private Nature Reserve
IUCN Not ReportedNature Reserve
0.05 km² overlap
Botterblom Nature Reserve
IUCN Not ReportedNature Reserve
0.04 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
3 920 distinct species · 250 069 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 Diep River : 27 espèces reliées par 49 interactions GloBI sur 5 types (connectance 6.6%, filtre Serrano α=0.2). 12 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°
16,8°C
Annual rain
613mm
Moisture idx (CMI)
-0,54
Runoff
294mm/an
PET
1 321mm
AET
518mm
Mean slope
3,0°
Water table
409cm
Forest
3%
Crops
80%
Urban
7%
Protected
17%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)