HydroBASINS lev08 watershed · #2080361570
Bassin de River Tas
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 1 administrative regions : NA
Sub-basin area
469,9km²
Upstream area
469,9km²
Discharge
4,46m³/s
Mean elev.
43m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
1 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom471.8 km²100.0% of basin
24 intersecting protected areas
Lower Wood, Ashwellthorpe
IUCN IVSite of Special Scientific Interest
0.38 km² overlap
Sea Mere, Hingham
IUCN IVSite of Special Scientific Interest
0.36 km² overlap
Site of Special Scientific Interest
0.34 km² overlap
Marston Marshes
IUCN IVLocal Nature Reserve
0.26 km² overlap
Caistor St. Edmund Chalk Pit
IUCN IVSite of Special Scientific Interest
0.24 km² overlap
Shotesham Common
IUCN IVSite of Special Scientific Interest
0.22 km² overlap
Fritton Common
IUCN IVSite of Special Scientific Interest
0.20 km² overlap
Norfolk Valley Fens
IUCN Not ReportedEmerald Network
0.17 km² overlap
Whitlingham
IUCN IVLocal Nature Reserve
0.11 km² overlap
15 more protected areassorted by overlap area
Smockmill Common
IUCN IVLocal Nature Reserve
0.10 km² overlap
Flordon Common
IUCN IVSite of Special Scientific Interest
0.10 km² overlap
Earlham Park Woods
IUCN IVLocal Nature Reserve
0.08 km² overlap
Coston Fen, Runhall
IUCN IVSite of Special Scientific Interest
0.07 km² overlap
Potter's Carr, Cranworth
IUCN IVSite of Special Scientific Interest
0.06 km² overlap
The Broads
IUCN VNational Park
0.06 km² overlap
Bowthorpe Marsh
IUCN IVLocal Nature Reserve
0.06 km² overlap
Eaton Common
IUCN IVLocal Nature Reserve
0.05 km² overlap
Forncett Meadows
IUCN IVSite of Special Scientific Interest
0.05 km² overlap
Pulham Market Big Wood
IUCN IVSite of Special Scientific Interest
0.04 km² overlap
Aslacton Parish Land
IUCN IVSite of Special Scientific Interest
0.04 km² overlap
Danby Wood
IUCN IVLocal Nature Reserve
0.04 km² overlap
Dunston Common
IUCN IVLocal Nature Reserve
0.04 km² overlap
Toll's Meadow, Wymondham
IUCN IVLocal Nature Reserve
0.02 km² overlap
Eaton Chalk Pit
IUCN IVSite of Special Scientific Interest
0.00 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
7 788 distinct species · 517 161 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 River Tas : 21 espèces reliées par 73 interactions GloBI sur 5 types (connectance 13.8%, 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°
9,8°C
Annual rain
624mm
Moisture idx (CMI)
-0,02
Runoff
305mm/an
PET
639mm
AET
485mm
Mean slope
1,0°
Water table
74cm
Forest
0%
Crops
87%
Urban
8%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)