Highlight the key points of prevention and accurately respond to public opinion
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Not long ago, the General Secretary of the Supreme Leader made important instructions on flood control and disaster relief, requiring relevant departments to accurately guide key areas to do disaster prevention work such as floods in small and medium-sized rivers, dangers in small and medium-sized reservoirs and urban waterlogging, and spare no effort to rescue and provide disaster relief. All localities and departments pay close attention to the floods of small and medium-sized rivers and the safety of small and medium-sized reservoirs, and implement preventive measures to ensure the safety of people’s lives and property.
At present, China has officially entered the critical period of "seven downs and eight highs" flood control, and many places have entered the main flood season. Since the flood season, China has experienced 18 times of heavy rainfall, and 271 rivers in 21 provinces have experienced floods exceeding the police. The rainy areas are mainly concentrated in the central northeast, the eastern northwest, the southwestern part of North China, the western part of Huanghuai, the eastern part of Jianghuai and the northwestern part of Hubei.
It is predicted that during the period of "Seven Downs and Eight Ups", there will be more extreme weather and climate events, and regional floods, droughts, high temperature and heat waves will be more important. How to prevent disasters such as floods in small and medium-sized rivers, dangers in small and medium-sized reservoirs and urban waterlogging? How to make up the short board? The reporter conducted an interview.
Grab early and grab small to deal with floods in small and medium-sized rivers.
In 4 hours, the rainwater converged from the Simian mountain slope, and the water level of the Qijiang River rose sharply. At the beginning of July, the "No.1 flood of the Qijiang River in 2023" was formed. "The floods in small and medium-sized rivers form quickly and the test is not small." Du Na, director of the Hydrology and Flood and Drought Disaster Prevention Center in Qijiang District of Chongqing, said.
Forecasts and warnings run ahead, winning the initiative for flood control. "After receiving the weather forecast and the warning of rising water risk in advance, we will transmit the early warning information to 70 villages in the first time. The person in charge of monitoring and early warning and the person in charge of transfer and resettlement will arrive at their posts in time to investigate potential risks and prepare emergency materials in advance. " Duna introduced.
Chongqing has rugged mountains and developed water systems, and small and medium-sized rivers are the focus of flood control. This year, Chongqing has defined the "four responsible persons" of the people’s government for flood control and flood fighting in 104 mountainous rivers, such as the chief executive, the competent department, the township and village river chiefs, and the patrol and management, and made every effort to ensure flood control safety.
Small and medium-sized rivers have many points and a wide range. How to prevent floods? "There are about 10,000 small and medium-sized rivers in China. These rivers have small areas, fast confluence and sudden floods. At the same time, the flood control standard is low, the forecasting and early warning system is lacking, and many factors are superimposed, making small and medium-sized rivers a high-risk area for floods. " Zuo Qiting, a professor at Zhengzhou University School of Water Conservancy and Transportation, introduced.
Take multiple measures to ensure flood control safety. Yao Wenguang, director of the Department of Flood and Drought Disaster Prevention of the Ministry of Water Resources, said that before the flood season, the water conservancy department carried out all-round inspections on river flood discharge, dike safety, and plan preparation, highlighting the river-related risks such as blocking backwater of bridges and culverts across ditches and silting of ditches, and urging all localities to improve plans and eliminate hidden dangers. During the flood season, we should adhere to the rolling forecast and early warning, improve the "call-to-answer" mechanism, and urge water conservancy departments at all levels to strengthen inspection and duty, and preset rescue forces, materials and equipment to ensure that dangerous situations can be found, reported and disposed of in time.
All localities heard of the "flood" and moved to implement various measures in detail. Hubei province has improved the early warning "call-and-answer" mechanism that integrates pre-response and goes directly to the front line to ensure that information reaches people. Jiangsu Province has completed the compilation of early warning response mechanism schemes for nine important flood channels, such as Sanhe Sluice and Huaihe River Inlet Channel, to ensure the flood safety of small and medium rivers.
"In the long run, it is necessary to coordinate emergency response and long-term planning." Zuo Qiting introduced that it is suggested to further strengthen the system management of small and medium-sized rivers, coordinate the upstream and downstream, left and right banks, main tributaries, scientifically formulate plans, carry out system management, promote dike reinforcement, dredging, water system connectivity, hardening and beautification, etc., and improve the overall flood control capacity. Next, the Ministry of Water Resources and related areas will speed up the pace of governance, giving priority to the implementation of river sections with cities at or above the county level, important towns and relatively concentrated populations along the river.
Compacting responsibility to ensure the safety of small and medium-sized reservoirs in flood season
At present, more than 98,000 reservoirs of various types have been built in China, which is of great responsibility to ensure the safety of reservoirs during flood season.
There are 4 medium-sized reservoirs and 26 small reservoirs in Wu ‘an City, Hebei Province, at the eastern foot of Taihang Mountain. The mountain is high and steep, and the source is short and the current is urgent. Once it encounters a rainstorm, the water level of the reservoir rises and falls sharply. "When the inspection is in place, I have a bottom in my heart." Huo Hongjun, a staff member of Shangkou Reservoir, said, "The reservoir operates at a water level below the flood limit. We have comprehensively overhauled the power generation tunnel, flood discharge tunnel, generator set and early warning equipment, and inspected key parts twice a day to ensure foolproof."
The "three responsible persons" of administration, technology and inspection must all be in place, and the key parts of the reservoir such as spillway and drainage facilities and the preparation of protective measures should be comprehensively investigated. In principle, all dangerous reservoirs will run empty during the main flood season … … A series of measures protect the reservoir from flood. "The key to reservoir flood control is prevention. When the responsibility goes to people, measures can be put in place. " Yao Wenguang said that when the reservoir stores and discharges flood, all personnel in the flood threat area should be transferred immediately. When the reservoir is in danger, it should be handled in time, and the personnel within the affected area should be transferred in advance to ensure the safety of people’s lives.
All localities should actively explore according to local conditions. Hubei Province requires that the responsible persons of dangerous reservoirs and reservoirs with high water level should be on duty at the dam during heavy rainfall. At present, the monitoring platform of Jingchu Reservoir has conducted telephone spot checks on more than 7,000 people and sent more than 18,000 early warning messages. Guizhou province pays special attention to the 24-hour patrol duty of dangerous reservoirs and reservoirs under construction, and requires that the reservoirs under construction should not be impounded without water storage acceptance.
Small reservoirs need extra vigilance during flood season. Zuo Qiting introduced that there are about 94,000 small reservoirs in China, accounting for over 95% of the total number of reservoirs. Small reservoirs have some problems, such as early construction time, low standard, unclear ownership and imperfect management. On the one hand, improve engineering measures, promote the reinforcement of small reservoirs and improve infrastructure. On the other hand, strengthen the construction of non-engineering system, strengthen forecasting, early warning, rehearsal and pre-planning measures, and ensure that someone is in charge, can rescue and can transfer in case of danger.
This year, the Ministry of Water Resources has implemented 128 large and medium-sized and 3,500 small dangerous reservoirs in an orderly manner, and basically completed the construction of rainwater forecasting facilities and dam safety monitoring facilities for small reservoirs before the flood season.
Precise policy to prevent urban waterlogging
In the middle of the night of July 6, Guangshui City, Hubei Province suffered from heavy rainfall and accumulated water in many parts of the city. Assemble teams, check hidden dangers and control traffic … … Up to now, Hubei has dispatched 18,000 emergency response forces and more than 2,800 equipment and vehicles, effectively ensuring the safety of urban operation during heavy rainfall.
In recent years, various regions and departments have intensified their efforts and made positive progress in urban waterlogging control, but there are also problems such as insufficient natural storage space and lagging drainage facilities. "Especially with the acceleration of urbanization, infrastructure such as high-rise buildings, roads and squares has changed the underlying surface to a great extent, and the formation time of urban waterlogging is fast, the flood peak flow is large, and the prevention is more difficult." Zuo Qiting said.
It is the key to prevent urban waterlogging and identify the risk points. The Ministry of Water Resources requires that urban flood control should be placed in the river basin flood control system, and the "four preparations" for forecasting, early warning, rehearsal and plan should be done well, and the measures of "refusing, bypassing and discharging" should be implemented. Hubei focused on urban main roads and drainage canals in waterlogging-prone sections, overhauled and maintained the facilities of drainage pumping stations in 463 cities, and timely rectified 278 waterlogging-prone points; Jiangsu has completed the renovation of 255 urban flood-prone areas (points).
Urban waterlogging should not only be prevented, but also treated. Zuo Qiting introduced, discharging, stagnation, infiltration and storage, and making full efforts. Arrange the drainage pumping station and other equipment, unblock the backbone drainage channel, let the accumulated water be discharged and the flood flow away; Increase urban green space and build a sponge city to allow rainwater to seep down; Keep the urban wetlands well, improve the rainwater storage facilities, and let the rainwater have a place to store.
"Urban construction should find a way for floods." Zuo Qiting introduced that rivers, lakes and reservoirs are natural flood storage places, and rivers are natural flood passages. The concept of green development runs through the whole process of urban planning and construction, and production, living and ecological space are rationally arranged, taking a connotative, intensive and green high-quality development path.
Coordinator of this issue: Guo Yue