HydroBASINS lev08 watershed · #2080053500
Bassin de Middleton Stop Drain
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
Sub-basin area
231,2km²
Upstream area
8 172,4km²
Discharge
65,86m³/s
Mean elev.
18m
Administrative coverage
Hydrographic chain
▼ Drains into
Outlet (drains to ocean / endorheic)
▲ Receives from 2 basins
- Bassin de River Nene (Old Course)615 km²
- Bassin de River Nar591 km²
3 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom230.8 km²99.4% of basin
- NAEngland · United Kingdom1.3 km²0.5% of basin
- NAEngland · United Kingdom0.1 km²0.0% of basin
11 intersecting protected areas
Norfolk Coast
IUCN VArea of Outstanding Natural Beauty
5.56 km² overlap
Roydon Common
IUCN Not ReportedWetland of International Importance (Ramsar Site)
1.95 km² overlap
Roydon Common and Dersingham Bog
IUCN Not ReportedEmerald Network
1.95 km² overlap
Roydon Common
IUCN IVSite of Special Scientific Interest
1.95 km² overlap
Roydon Common
IUCN IVNational Nature Reserve
1.83 km² overlap
Site of Special Scientific Interest
0.88 km² overlap
The Wash
IUCN IVNational Nature Reserve
0.36 km² overlap
Grimston Warren Pit
IUCN IVSite of Special Scientific Interest
0.07 km² overlap
River Nar
IUCN IVSite of Special Scientific Interest
0.05 km² overlap
2 more protected areassorted by overlap area
Bawsey
IUCN IVSite of Special Scientific Interest
0.03 km² overlap
Islington Heronry
IUCN IVSite of Special Scientific Interest
0.01 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
5 004 distinct species · 197 934 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 35 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 Middleton Stop Drain : 22 espèces reliées par 91 interactions GloBI sur 6 types (connectance 15.3%, filtre Serrano α=0.2). 13 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°
9,5°C
Annual rain
592mm
Moisture idx (CMI)
-0,10
Runoff
297mm/an
PET
657mm
AET
486mm
Mean slope
0,7°
Water table
50cm
Forest
0%
Crops
78%
Urban
10%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)