HydroBASINS lev08 watershed · #2080053950
Bassin de Western Adur
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 : Brighton and Hove, NA, West Sussex
Sub-basin area
592,1km²
Upstream area
592,1km²
Discharge
2,2m³/s
Mean elev.
53m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- West SussexEngland · United Kingdom466.8 km²78.6% of basin
- Brighton and HoveEngland · United Kingdom75.2 km²12.7% of basin
- NAEngland · United Kingdom45.0 km²7.6% of basin
30 intersecting protected areas
South Downs
IUCN VNational Park
176.40 km² overlap
High Weald
IUCN VArea of Outstanding Natural Beauty
22.87 km² overlap
Brighton and Lewes Downs Biosphere
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
9.37 km² overlap
Site of Special Scientific Interest
3.21 km² overlap
Beachy Head West
IUCN IVMarine Conservation Zone
3.13 km² overlap
Beachy Head West
IUCN Not ReportedMarine Protected Area (OSPAR)
3.08 km² overlap
Wild Park
IUCN IVLocal Nature Reserve
2.40 km² overlap
Stanmer Park/Coldean
IUCN IVLocal Nature Reserve
1.88 km² overlap
Brighton to Newhaven Cliffs
IUCN IVSite of Special Scientific Interest
1.65 km² overlap
21 more protected areassorted by overlap area
Newtimber and Pangdean
IUCN VNature Reserve
1.17 km² overlap
Castle Hill
IUCN IVSite of Special Scientific Interest
1.14 km² overlap
Castle Hill
IUCN Not ReportedEmerald Network
1.14 km² overlap
Clayton to Offham Escarpment
IUCN IVSite of Special Scientific Interest
1.02 km² overlap
Nature Reserve
0.97 km² overlap
Cissbury Ring
IUCN IVSite of Special Scientific Interest
0.84 km² overlap
Wolstonbury Hill
IUCN VNature Reserve
0.84 km² overlap
Chanctonbury Hill
IUCN IVSite of Special Scientific Interest
0.83 km² overlap
Fulking Escarpment
IUCN VNature Reserve
0.74 km² overlap
Ditchling Common
IUCN IVSite of Special Scientific Interest
0.66 km² overlap
Bevendean Down
IUCN IVLocal Nature Reserve
0.65 km² overlap
Adur Estuary
IUCN IVSite of Special Scientific Interest
0.60 km² overlap
Wolstonbury Hill
IUCN IVSite of Special Scientific Interest
0.59 km² overlap
Whitehawk/Race Hill
IUCN IVLocal Nature Reserve
0.50 km² overlap
Cissbury Ring
IUCN VNature Reserve
0.48 km² overlap
Castle Hill
IUCN IVNational Nature Reserve
0.47 km² overlap
Bedelands Farm
IUCN IVLocal Nature Reserve
0.35 km² overlap
Warren Hill
IUCN VNature Reserve
0.33 km² overlap
Lancing Ring
IUCN IVLocal Nature Reserve
0.29 km² overlap
Shoreham Beach
IUCN IVLocal Nature Reserve
0.26 km² overlap
Beacon Hill
IUCN IVLocal Nature Reserve
0.19 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
8 955 distinct species · 636 097 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 Western Adur : 26 espèces reliées par 82 interactions GloBI sur 5 types (connectance 15.5%, filtre Serrano α=0.2). 7 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°
9,9°C
Annual rain
688mm
Moisture idx (CMI)
-0,05
Runoff
395mm/an
PET
726mm
AET
529mm
Mean slope
2,8°
Water table
146cm
Forest
0%
Crops
24%
Urban
28%
Protected
35%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)