4K 30p Aerial footage. A lake surrounded by forests. The water has decreased in the season without precipitation. There is a serious reduction in water level. The water is diminishing, then the soil and mud is visible. Level difference. The beginning of the drought. Lake waters evaporate in hot weather and then water loss occurs. Traces of global warming. Global warming indication. Shrinking lake bed in semi arid climate. Water supply. Dry parts of the dam lake.