Study Site : Nam Ngum Reservoir is located at 18° 32.265'
N, at 102° 34.868' E and at an altitude of 197 m above
the sea level (Figure 1). The maximum volume of the
reservoir is 7010x106 m3. The dam is approximately 90 km
north of Vientiane. Sample was collected from
the surface to the deepest point of the reservoir and
the physical and chemical properties of the water were
determined.