The 34.1% peak cut rate of the Three Gorges Reservoir reduces downstream flood control pressure
Beijing, August 20th (Reporter Chen Chen) The Three Gorges Reservoir has a maximum inflow of 75,000 cubic meters per second at 8 o'clock on the 20th. It has lasted 9 hours as of press time, which is the largest inflow since the establishment of the reservoir in 2003; 17:00 The water level of the Three Gorges Reservoir is 163.15 meters, and the outflow flow is 48,800 cubic meters per second. The water level of the main stream from Yichang, Shashi to Lianhuatang and Dongting Lake below the Three Gorges Reservoir of the Yangtze River exceeds the alarm by 0.07 to 0.69 meters. The Cuntan Hydrological Station on the upper reaches of the Yangtze River has a flood peak water level of 191.62 meters at 8:15 on the 20th, exceeding the guaranteed water level by 8.12 meters, ranking second since 1892 (the highest water level in history was 192.78 meters in August 1905), with a maximum flow of 74,600 Cubic meters per second; at 17:00 on the 20th, the water level was 191.03 meters, which was still 7.53 meters. It is expected that within 48 hours, the Zhutuojiang section of the upper reaches of the Yangtze River, the Beibei and Dongjintuojiang sections of the lower Jialing River will retreat below the warning water level.
The Ministry of Water Resources attaches great importance to flood prevention in the upper reaches of the Yangtze River. E Jingping, deputy commander-in-chief of the State Administration of Defense and Minister of Water Resources, called for strengthening monitoring, forecasting and early warning, scientifically dispatching the reservoirs on the upper reaches of the Yangtze River with the Three Gorges Reservoir as the core, coordinating the safety of flood control in the reservoir area and downstream, and maximizing the benefits of flood control and disaster reduction. The Yangtze River Water Resources Commission of the Ministry of Water Resources issued 12 dispatch orders. On the 18th, the Three Gorges Reservoir was dispatched twice to increase the discharge flow to 46,000 cubic meters per second and 48,000 cubic meters per second respectively to reduce the impact of the reservoir area inundation; and overall consideration was given to mitigating downstream flood control. Under pressure, the maximum discharge flow of the Three Gorges Reservoir is 49,400 cubic meters per second, and the peak cut rate is 34.1%. At the same time, further tap the potential of the cascade reservoir groups in the Jinping I and Ertan of the Yalong River, Xiluodu, Xiangjiaba, and Wudongde of the Jinsha River. All efforts will be made to stop floods and reduce the pressure on flood control in the areas along the Yangtze River in Sichuan and Chongqing. According to statistics, from August 16 to 12:00 on August 20, the reservoirs in the upper reaches of the Yangtze River blocked more than 8 billion cubic meters of flood water, of which the Three Gorges Reservoir blocked about 4 billion cubic meters of flood.
The Chongqing Water Conservancy Bureau initiated the first-level emergency response for flood control, and successively sent 16 expert teams to key flood control areas to strengthen technical support, and delineated the affected area according to the flood frequency; Tongnan, Jiangjin, Banan and other districts and counties actively responded and transferred safely There are about 250,000 people in the threatened area. The Sichuan Provincial Water Resources Department initiated the first-level emergency response for flood control, scientifically dispatched key water conservancy projects, maximized the role of flood arrest and peak reduction, and reduced the pressure of downstream flood control. It dispatched the Minjiang Zipingpu, Pubugou, and Wawushan reservoirs to intercept 600 million cubic meters of floodwater. The Wudu Reservoir on the Fujiang River was dispatched to hold 200 million cubic meters of flood water, and the Tingzikou, Baozhu Temple, and Shengzhong Reservoirs of the Jialing River were dispatched to hold 1.2 billion cubic meters of flood water.