The hydrological and geochemical monitoring is performed on progressively increasing watershed size therefore permitting the coupling between the local and the regional scales. The spatial limits of these watersheds along with the location of the monitoring stations are given in the map below (Figure 1); their characteristics are shown in Table 1 (see below).

 

Carte du bassin amont du Nyong
Carte du bassin amont du Nyong

Station River Longitude Latitude Elevation (m) Area (km²) Length (km) Slope (‰) Order
Nsimi Mengong 11° 50′ E 3° 10′ N 669 0,60 0,75 13,3 1
Messam Awout 11° 47′ E 3° 17′ N 647 206 30 1,2 3
Pont So’o So’o 11° 29′ E 3° 19′ N 634 3.070 107 1,1 4
Mbalmayo Nyong 11° 30′ E 3° 31′ N 634 13.555 360 0,16 5
Olama Nyong 11° 17′ E 3° 26′ N 628 18.510 419 0,15 5

Table I – Characteristics of monitored stations and watersheds of the Upper-Nyong River