Synoptic conditions and impact on the extreme subside of the water level in the Bulgarian section of the Danube River

The river Danube is main waterway for the countries of the Danube basin. The navigation on the river Danube was difficult during two periods of the low water stages of the year. The summer was the first period-as a result of the drying. The second one is during the winter, when there were the freezing precipitation and the run-off process is absented. The summer law water stages in the Bulgarian section of the Danube River are examined in the work. During the summer 2003 as a result of unexpected continued drying in West and Central Europe the water level of the river Danube achieved a record extreme subside for last 100 years. It was the result of the breach of order of zonal atmospheric circulation over Europe and the blocking circulation for any length of time over the West part of Europe.(Author)