Improve the "storage" and "discharge" capacity, accelerate the repair of water damaged projects, Ministry of Water Resources: There are weak links in flood control in the Haihe River Basin | Flood | Weak links
On the 21st, the Ministry of Water Resources held a press conference on the prevention of the "23.7" catastrophic flood in the Haihe River Basin. Vice Minister of Water Resources Liu Weiping introduced that in response to this catastrophic flood, the Ministry of Water Resources implemented the flood control policy of "upper storage, middle drainage, lower discharge, and appropriate detention" in the Haihe River Basin. 84 large and medium-sized reservoirs were used to intercept 2.85 billion cubic meters of flood, and key hubs such as Beiguan and Lugou Bridge were ordered to divert and release flood. Eight flood storage and detention areas were opened for diversion and storage, with a maximum storage capacity of 2.53 billion cubic meters. The comprehensive role of the basin's flood control engineering system in flood control and disaster reduction was fully utilized, minimizing the impact and losses of floods. Preliminary statistics show that through scientific and precise scheduling, flooding of 24 towns and 7.51 million mu of arable land has been avoided, and 4.623 million people have been relocated.
At the press conference, Zhang Xiangwei, Director of the Planning and Planning Department of the Ministry of Water Resources, said that the recent catastrophic flood in the Haihe River Basin has also exposed weak links in the flood control and disaster reduction system. Specifically, there are shortcomings in the "three lines of defense" for monitoring and forecasting rainfall conditions, consisting of meteorological satellites, rain radars, rainfall stations, and hydrological stations. Some rivers find it difficult to accurately predict flood conditions in a timely manner. The second issue is that the river sources in the Haihe River Basin are short and rapid, with concentrated flood volume. Some upstream flood control reservoirs have not yet been constructed, and the flood retention capacity is insufficient. Floods in mountainous areas directly enter the plains. The third issue is land subsidence in the watershed. Some river channels have been experiencing severe flooding and siltation for many years, and some river channels and embankments have not met the standards for construction. The flood discharge capacity does not meet the planning requirements. The fourth issue is the lag in the construction of flood storage and detention areas, especially the imperfect facilities for inflow and outflow, which affects the effective diversion and storage of floods. The fifth is that the digital twin watershed is in its early stages, and the modern information technology support for water engineering joint scheduling is insufficient. The "four pre" capabilities of flood forecasting, early warning, rehearsal, and contingency plan are insufficient, which affects the precise scheduling of floods.
We will mainly focus on six aspects of work: first, accelerate the repair of water damaged projects, and basically complete the repair of water damaged water conservancy facilities before next year's flood season. The second is to improve the storage capacity, accelerate the safe construction of flood control reservoirs and storage and detention areas, and enhance the flood regulation and storage capacity. The third is to improve the ability of "discharge", strengthen the management of backbone rivers, dredge rivers, and ensure smooth flood discharge. Implement the three-year action plan to meet the standards for the construction of important embankments in the backbone of the Haihe River, while accelerating the governance of small and medium-sized rivers and flash floods. The fourth is to promote urban flood control construction, incorporate urban flood control into the basin flood control engineering system, follow the idea of "rejecting, bypassing, and discharging", accelerate the construction of key regional flood control engineering systems, enhance urban flood control and drainage capabilities, and ensure urban flood control safety. The fifth is to promote the construction of digital twin watersheds, accelerate the construction of "three lines of defense" for rainfall monitoring and forecasting, promote the construction of digital twin watersheds and "four pre" capabilities, and provide support for flood control scheduling decision-making and management. The sixth is to improve the system, mechanism and rule of law, strengthen the management of flood storage and detention areas and spatial control of river channels, strengthen water administrative law enforcement, strictly crack down on behaviors such as encroachment on river and lake shorelines, reservoir capacity, and obstruction of river flood discharge, ensuring smooth flood discharge channels and ensuring flood safety.
Affected by the northward movement of Typhoon "Dussuri" and cold air, from July 28th to August 1st, there was a heavy rainfall process in the entire Haihe River basin, with a cumulative surface rainfall of 155.3 millimeters. Among them, Beijing's 83 hour surface rainfall reached 331 millimeters, which is 60% of the annual rainfall. Affected by it, 22 rivers in the Haihe River Basin experienced floods exceeding the warning level, 8 rivers experienced the largest floods since measured data, Daqing River and Yongding River experienced catastrophic floods, Ziya River experienced catastrophic floods, and Haihe River Basin experienced catastrophic floods. This catastrophic flood is the largest flood in the Haihe River Basin since 1963.
