HydroBASINS lev08 watershed · #2080402900
Bassin de River Avon
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 : NA
Sub-basin area
409,4km²
Upstream area
409,5km²
Discharge
6,62m³/s
Mean elev.
130m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom410.6 km²99.9% of basin
- NAEngland · United Kingdom0.4 km²0.1% of basin
17 intersecting protected areas
North Wessex Downs
IUCN VArea of Outstanding Natural Beauty
164.64 km² overlap
Salisbury Plain
IUCN IVSite of Special Scientific Interest
80.20 km² overlap
Salisbury Plain
IUCN Not ReportedEmerald Network
80.18 km² overlap
Salisbury Plain
IUCN Not ReportedEmerald Network
80.18 km² overlap
Pewsey Downs
IUCN IVSite of Special Scientific Interest
3.02 km² overlap
Pewsey Downs
IUCN IVNational Nature Reserve
1.67 km² overlap
Pewsey Downs
IUCN Not ReportedEmerald Network
1.54 km² overlap
River Avon System
IUCN IVSite of Special Scientific Interest
1.14 km² overlap
River Avon
IUCN Not ReportedEmerald Network
1.07 km² overlap
8 more protected areassorted by overlap area
Savernake Forest
IUCN IVSite of Special Scientific Interest
0.50 km² overlap
Normanton Down
IUCN IVNature Reserve
0.47 km² overlap
Stonehenge Landscape
IUCN VNature Reserve
0.29 km² overlap
Lower Woodford Water Meadows
IUCN IVSite of Special Scientific Interest
0.24 km² overlap
Avon Valley
IUCN IVLocal Nature Reserve
0.20 km² overlap
Jones's Mill
IUCN IVSite of Special Scientific Interest
0.11 km² overlap
Camp Down
IUCN IVSite of Special Scientific Interest
0.07 km² overlap
Local Nature Reserve
0.07 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
4 781 distinct species · 303 648 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 25 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 River Avon : 12 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 127 interactions GloBI sur 5 types (connectance 31.3%, filtre Serrano α=0.2). 17 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°
9,4°C
Annual rain
738mm
Moisture idx (CMI)
0,07
Runoff
481mm/an
PET
688mm
AET
518mm
Mean slope
2,5°
Water table
141cm
Forest
0%
Crops
56%
Urban
5%
Protected
60%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)