HydroBASINS lev08 watershed · #2080370330
Bassin de River Leam
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
374,3km²
Upstream area
374,3km²
Discharge
4,07m³/s
Mean elev.
101m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
2 dept-equivalent regions (GADM L2)
- NAEngland · United Kingdom320.2 km²85.2% of basin
- NAEngland · United Kingdom55.6 km²14.8% of basin
18 intersecting protected areas
Site of Special Scientific Interest
0.79 km² overlap
Leam Valley
IUCN IVLocal Nature Reserve
0.42 km² overlap
Ufton Fields
IUCN IVSite of Special Scientific Interest
0.32 km² overlap
Ufton Fields
IUCN IVLocal Nature Reserve
0.32 km² overlap
Ryton Wood
IUCN IVSite of Special Scientific Interest
0.31 km² overlap
Harbury Railway Cutting
IUCN IVSite of Special Scientific Interest
0.27 km² overlap
Site of Special Scientific Interest
0.24 km² overlap
Ashlawn Cutting
IUCN IVLocal Nature Reserve
0.08 km² overlap
Welches Meadow
IUCN IVLocal Nature Reserve
0.07 km² overlap
9 more protected areassorted by overlap area
River Itchen
IUCN IVSite of Special Scientific Interest
0.06 km² overlap
Draycote Meadows
IUCN IVSite of Special Scientific Interest
0.06 km² overlap
Whitnash Brook
IUCN IVLocal Nature Reserve
0.05 km² overlap
Calcutt Locks Meadows
IUCN IVSite of Special Scientific Interest
0.04 km² overlap
Harbury Quarries
IUCN IVSite of Special Scientific Interest
0.03 km² overlap
Hall Farm meadow, Hunningham
IUCN IVLocal Nature Reserve
0.01 km² overlap
Waverley Wood Farm
IUCN IVSite of Special Scientific Interest
0.01 km² overlap
Stockton Railway Cutting
IUCN IVLocal Nature Reserve
0.01 km² overlap
Napton Hill 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
6 304 distinct species · 379 501 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 23 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 Leam : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 33 interactions GloBI sur 2 types (connectance 13.0%, filtre Serrano α=0.2). 5 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
622mm
Moisture idx (CMI)
-0,08
Runoff
336mm/an
PET
678mm
AET
504mm
Mean slope
1,5°
Water table
104cm
Forest
0%
Crops
62%
Urban
9%
Protected
1%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)