Xinhua News Agency, June 1, starting today (June 1), the Yangtze River Basin has entered the main flood season. Affected by the recent heavy rainfall in the upper reaches of the Yangtze River, the water level in the Chongqing section of the Yangtze River has risen significantly. According to the situation of water level detection, the relevant departments shall adjust the position of navigation marks in time to ensure the safety of waterways.