In the process of preventing major floods in the Haihe River Basin, the Ministry of Water Resources utilized 84 large and medium-sized reservoirs to block 2.85 billion cubic meters of flood, and dispatched key hubs such as Beiguan and Lugou Bridge to orderly distribute and release floods. Eight flood storage and detention areas were used to divert and retain flood, 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, At the press conference held by the Ministry of Water Resources on the prevention of the "23.7" catastrophic flood in the Haihe River Basin, Vice Minister of Water Resources Liu Weiping introduced. Affected by the northward movement of Typhoon "Dussuri" and the 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, accounting for 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 the Haihe River Basin experienced catastrophic floods, marking the largest flood since 1963. The magnitude of rainstorm floods in Ziya River, Daqing River and Yongding River is large, and the opening of some flood storage and detention areas is inevitable. The Haihe Water Resources Committee of the Ministry of Water Resources (hereinafter referred to as the Haihe Water Resources Committee), Tianjin and Hebei jointly studied and judged the use of flood storage and detention areas such as Yongding River floodplain and Dongdian, and reported the Application for Opening Dongdian Flood Storage and Detention Area to the Ministry of Water Resources two days in advance to reserve sufficient time for the relocation of personnel in the area. About 2.5 billion cubic meters of flood in the Haihe River Basin will be discharged from Tianjin, mainly from the North Canal, Yongding River floodplain, Dongdian flood storage and detention area, and Baiyangdian. Currently, it has traveled 300 million to 500 million cubic meters, and the water in the Dongdian flood storage and detention area will recede for more than 2 months. "Yang Bang, Deputy Director and Chief Forecaster of the Intelligence Department of the Hydrological Bureau of the CPC, predicted on August 5th. Hydrology is the "sharp soldier" and "eye and ear" on the flood control battlefield, and hydrological information is an important basis for flood control scheduling and command decision-making, and an important support for fighting a good flood defense battle. Liu Zhiyu, Deputy Director of the Hydrology Department of the Ministry of Water Resources, introduced that the catastrophic flood in the Haihe River caused serious damage to the measuring and reporting facilities of some hydrological monitoring stations in the basin. In critical situations, frontline flood monitoring and reporting personnel stick to the front line of flood monitoring and immediately initiate a super standard flood monitoring and reporting plan. Emergency testing methods such as radio wave velocity meters and water surface gradient are used to measure flood peaks, and satellite phone reports are made. The frequency of monitoring and reporting is encrypted to one hour per report, and at critical moments, it is reported every half an hour or even ten minutes, making every effort to ensure uninterrupted hydrological information. In addition, the Maritime Affairs Commission also fully utilizes the "three lines of defense" composed of meteorological satellites and rainfall radars, rainfall stations, and hydrological stations for monitoring and forecasting of rainfall and water conditions, and adopts four pre measures of "forecasting, early warning, rehearsal, and contingency plan" to achieve refined rolling flood forecasting by river, reservoir, and station, accurately guiding the flood diversion and utilization of flood storage and detention areas such as Yongding River floodplain, Xiaoqing River floodplain, Langouwa, and Dongdian, greatly weakening flood peaks, Greatly alleviated the flood discharge pressure of downstream rivers. Liu Weiping introduced that according to preliminary statistics, through scientific and meticulous scheduling, flooding of 24 towns and 7.51 million mu of arable land has been avoided, and 4.623 million people have been transferred, fully leveraging