HydroBASINS lev08 watershed · #2080022540
Bassin de l'Aa
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 : Nord, Pas-de-Calais
Sub-basin area
933,9km²
Upstream area
933,9km²
Discharge
17,58m³/s
Mean elev.
81m
Administrative coverage
Species present
Ecological tissue
Graphe en cours d’indexation
Calcul du tissu écologique de cette entité.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 2s).
Hydroclimate (BasinATLAS lev08)
Mean T°
10,1°C
Annual rain
666mm
Moisture idx (CMI)
0,03
Runoff
555mm/an
PET
647mm
AET
494mm
Mean slope
2,2°
Water table
122cm
Forest
0%
Crops
61%
Urban
7%
Protected
58%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)