People watch scenery at the Hukou Waterfall scenic spot in north China's Shanxi Province, June 30, 2019. The water volume at Hukou Waterfall surges due to the increase of the rainfalls and flood discharges on the upper reaches of the Yellow River. (Xinhua/Lyu Guiming)

People watch scenery at the Hukou Waterfall scenic spot in north China's Shanxi Province, June 30, 2019. The water volume at Hukou Waterfall surges due to the increase of the rainfalls and flood discharges on the upper reaches of the Yellow River. (Xinhua/Lyu Guiming)

People watch scenery at the Hukou Waterfall scenic spot in north China's Shanxi Province, June 30, 2019. The water volume at Hukou Waterfall surges due to the increase of the rainfalls and flood discharges on the upper reaches of the Yellow River. (Xinhua/Lyu Guiming)

People watch scenery at the Hukou Waterfall scenic spot in north China's Shanxi Province, June 30, 2019. The water volume at Hukou Waterfall surges due to the increase of the rainfalls and flood discharges on the upper reaches of the Yellow River. (Xinhua/Lyu Guiming)