HydroBASINS lev08 watershed · #2080049620
Bassin de Little Avon 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 : NA, South Gloucestershire
Sub-basin area
307,3km²
Upstream area
307,3km²
Discharge
2,47m³/s
Mean elev.
59m
Administrative coverage
3 dept-equivalent regions (GADM L2)
- South GloucestershireEngland · United Kingdom168.5 km²54.6% of basin
- NANA · United Kingdom126.9 km²41.1% of basin
- NAEngland · United Kingdom5.2 km²1.7% of basin
29 intersecting protected areas
Cotswolds
IUCN VArea of Outstanding Natural Beauty
69.50 km² overlap
Severn Estuary/ Môr Hafren
IUCN Not ReportedEmerald Network
11.19 km² overlap
Severn Estuary
IUCN IVSite of Special Scientific Interest
11.04 km² overlap
Severn Estuary
IUCN IVWetland of International Importance (Ramsar Site)
10.88 km² overlap
Severn Estuary
IUCN Not ReportedEmerald Network
10.84 km² overlap
Severn Estuary / Môr Hafren
IUCN Not ReportedMarine Protected Area (OSPAR)
8.90 km² overlap
Severn Estuary
IUCN Not ReportedMarine Protected Area (OSPAR)
8.54 km² overlap
Lower Woods
IUCN IVSite of Special Scientific Interest
2.83 km² overlap
Midger
IUCN IVSite of Special Scientific Interest
0.59 km² overlap
20 more protected areassorted by overlap area
Newark Park
IUCN VNature Reserve
0.54 km² overlap
Horton Court
IUCN VNature Reserve
0.42 km² overlap
Bishop's Hill Wood
IUCN IVSite of Special Scientific Interest
0.30 km² overlap
Wotton Hill
IUCN IVSite of Special Scientific Interest
0.26 km² overlap
Stinchcombe Hill
IUCN IVSite of Special Scientific Interest
0.20 km² overlap
Wotton-under-Edge
IUCN VNature Reserve
0.16 km² overlap
Coombe Hill
IUCN IVSite of Special Scientific Interest
0.16 km² overlap
Yarley Meadows
IUCN IVSite of Special Scientific Interest
0.11 km² overlap
Upton Coombe
IUCN IVSite of Special Scientific Interest
0.08 km² overlap
Aust Cliff
IUCN IVSite of Special Scientific Interest
0.06 km² overlap
Boxwell
IUCN IVSite of Special Scientific Interest
0.05 km² overlap
Hawkesbury Meadow
IUCN IVSite of Special Scientific Interest
0.03 km² overlap
Nibley Knoll
IUCN IVSite of Special Scientific Interest
0.03 km² overlap
Cattybrook Brickpit
IUCN IVSite of Special Scientific Interest
0.02 km² overlap
Gorse Covert
IUCN IVLocal Nature Reserve
0.02 km² overlap
Buckover Road Cutting
IUCN IVSite of Special Scientific Interest
0.02 km² overlap
Cullimore's Quarry
IUCN IVSite of Special Scientific Interest
0.01 km² overlap
Brinkmarsh Quarry
IUCN IVSite of Special Scientific Interest
0.00 km² overlap
Damery Road Section
IUCN IVSite of Special Scientific Interest
0.00 km² overlap
Hawkesbury Quarry
IUCN IVSite of Special Scientific Interest
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 905 distinct species · 649 357 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 40 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 Little Avon River : 34 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 109 interactions GloBI sur 5 types (connectance 14.0%, filtre Serrano α=0.2). 6 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°
9,7°C
Annual rain
783mm
Moisture idx (CMI)
0,14
Runoff
536mm/an
PET
670mm
AET
527mm
Mean slope
2,4°
Water table
124cm
Forest
0%
Crops
34%
Urban
11%
Protected
28%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)