HydroBASINS lev08 watershed · #2080053940
Bassin de Ouse
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
574,5km²
Upstream area
574,5km²
Discharge
9,03m³/s
Mean elev.
62m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom446.7 km²77.5% of basin
- West SussexEngland · United Kingdom129.9 km²22.5% of basin
- Brighton and HoveEngland · United Kingdom0.0 km²0.0% of basin
30 intersecting protected areas
High Weald
IUCN VArea of Outstanding Natural Beauty
201.41 km² overlap
South Downs
IUCN VNational Park
123.46 km² overlap
Ashdown Forest
IUCN Not ReportedEmerald Network
9.52 km² overlap
Ashdown Forest
IUCN IVSite of Special Scientific Interest
9.51 km² overlap
Brighton and Lewes Downs Biosphere
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
9.26 km² overlap
Ashdown Forest
IUCN Not ReportedEmerald Network
9.00 km² overlap
Lewes Brooks
IUCN IVSite of Special Scientific Interest
3.39 km² overlap
Clayton to Offham Escarpment
IUCN IVSite of Special Scientific Interest
3.21 km² overlap
Firle Escarpment
IUCN IVSite of Special Scientific Interest
2.56 km² overlap
21 more protected areassorted by overlap area
Chailey Common
IUCN IVLocal Nature Reserve
1.73 km² overlap
Chailey Common
IUCN IVSite of Special Scientific Interest
1.71 km² overlap
Lewes Downs
IUCN IVSite of Special Scientific Interest
1.65 km² overlap
Plashett Park Wood
IUCN IVSite of Special Scientific Interest
1.58 km² overlap
Wakehurst & Chiddingly Woods
IUCN IVSite of Special Scientific Interest
1.56 km² overlap
Lewes Downs
IUCN Not ReportedEmerald Network
1.46 km² overlap
Black Cap
IUCN VNature Reserve
1.23 km² overlap
Nymans Estate
IUCN VNature Reserve
1.18 km² overlap
Buxted Park
IUCN IVSite of Special Scientific Interest
0.85 km² overlap
Nature Reserve
0.83 km² overlap
Cow Wood and Harry's Wood
IUCN IVSite of Special Scientific Interest
0.75 km² overlap
Ardingly Reservoir
IUCN IVLocal Nature Reserve
0.75 km² overlap
Wakehurst Place
IUCN VNature Reserve
0.72 km² overlap
Site of Special Scientific Interest
0.63 km² overlap
Lewes Downs (Mount Caburn)
IUCN IVNational Nature Reserve
0.49 km² overlap
Offham Marshes
IUCN IVSite of Special Scientific Interest
0.39 km² overlap
Blunts and Paiges Wood
IUCN IVLocal Nature Reserve
0.29 km² overlap
Lewes Brooks
IUCN IVNature Reserve
0.25 km² overlap
Nature Reserve
0.21 km² overlap
Freshfield Lane
IUCN IVSite of Special Scientific Interest
0.17 km² overlap
Railway Land Lewes
IUCN IVLocal Nature Reserve
0.11 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 386 distinct species · 629 146 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 29 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 Ouse : 19 espèces reliées par 83 interactions GloBI sur 6 types (connectance 20.4%, 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°
9,9°C
Annual rain
699mm
Moisture idx (CMI)
-0,03
Runoff
401mm/an
PET
724mm
AET
526mm
Mean slope
2,8°
Water table
148cm
Forest
2%
Crops
23%
Urban
9%
Protected
57%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)