The temperature of the Waldemar River water increases with its flow and its decrease is periodically observed at the estuary,this is due to the tides. The amount of suspension transported by the Waldemar River decreases when it gets closer to the river mouth resulting in the deposition and building of the sandur plain. The general mineralization of the water is inversely proportional to the ablation size. The decrease in conductivity is evidence for the significant participation of ablation waters in the outflow, this has been confirmed by other authors (among others Krawczyk et al., 1990; Jania, 1993).
The formation of the glacier barrier lake has been observed on Waldemar Glacier since 1995. The lake occupies an area of about 0.5 ha. It was formed due to the outflow blockade by the central moraine ridge in the western part of the glacier.
The intensity of the main flow supplying the lake was directly proportional to the glacier ablation. With the increase of glacier melting, the supply of water in the lake increases. At the same time, the increased outflow from the reservoir causes a greater outflow of the glacier river. In the study period, 239760.0 m3 water flowed out of the lake. At the same time, the outflow in the upper part of Waldemar River was 1159355 m3. This means that the outflow from the glacier lake was 20.7% outflow from Waldemar Glacier. The remaining 79.3% came directly from the glacier ablation. This ratio shows the role of the barrier lake in the total outflow from the glacier and in supplying the Waldemar River.
In summer the outflow from the glacier and glacier river basin depends mainly on the size of glacier ablation ,other local sources are of secondary importance . The fact that the 1996 summer was short and cold with and very wet, had a significant influence on the outflow from Waldemar Glacier.