HydroBASINS lev08 watershed · #1080088070
Bassin de Oued Nahr-Ouassel
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 5 administrative regions : Azziz, Boughezoul, Chahbounia, El Khemis, Sidi Ladjel
Sub-basin area
680,4km²
Upstream area
16 658,2km²
Discharge
9,55m³/s
Mean elev.
697m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 2 basins
- Bassin de Oued Ourek518 km²
- Bassin de Oued Nahr-Ouassel28 km²
5 dept-equivalent regions (GADM L2)
- 379.5 km²55.8% of basin
- 91.4 km²13.4% of basin
- 81.6 km²12.0% of basin
- 78.2 km²11.5% of basin
- Sidi LadjelDjelfa · Algeria49.8 km²7.3% of basin
1 intersecting protected areas
Lac du Barrage de Boughezoul
IUCN Not ReportedWetland of International Importance (Ramsar Site)
26.68 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
9 distinct species · 13 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Not enough documented interactions to build a meaningful graph for this territory.
Hydroclimate (BasinATLAS lev08)
Mean T°
15,9°C
Annual rain
339mm
Moisture idx (CMI)
-0,71
Runoff
101mm/an
PET
1 177mm
AET
291mm
Mean slope
0,8°
Water table
189cm
Forest
0%
Crops
0%
Urban
1%
Protected
0%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)