HydroBASINS lev08 watershed · #4081025940
Bassin de Sông Cầu
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 10 administrative regions : Bắc Ninh, Chí Linh, Hiệp Hòa, Quế Võ, Sóc Sơn +5
Sub-basin area
453km²
Upstream area
5 705,4km²
Discharge
139,88m³/s
Mean elev.
9m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Sông Cà Lồ630 km²
- Bassin de Sông Cầu105 km²
10 dept-equivalent regions (GADM L2)
- 82.9 km²18.4% of basin
- 81.7 km²18.1% of basin
- 68.5 km²15.2% of basin
- 63.3 km²14.0% of basin
- 57.2 km²12.7% of basin
- 45.4 km²10.0% of basin
- 31.9 km²7.1% of basin
- 20.4 km²4.5% of basin
2 moreFull L2 list
- Sóc Sơn0.5 km² · 0.1%
- Chí Linh0.0 km² · 0.0%
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
75 distinct species · 97 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 20 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 Sông Cầu : 20 espèces reliées par 13 interactions GloBI sur 2 types (connectance 6.8%, filtre Serrano α=0.2).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
23,8°C
Annual rain
1 650mm
Moisture idx (CMI)
0,21
Runoff
798mm/an
PET
1 301mm
AET
1 059mm
Mean slope
0,6°
Water table
24cm
Forest
0%
Crops
81%
Urban
63%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)