After nearly 14 years of being put into use, the dike line covering the low-lying Hai Lang area, Quang Tri province has contributed to preventing minor floods and early floods, preventing flooding, protecting more than 5,000 hectares of rice and aquaculture in 12 regional communes. low-lying Hai Lang district. However, in the face of abnormal changes in weather, the anti-flood elevation of this embankment is no longer suitable. The drainage and drainage system for the Hai Lang low-lying area does not meet the requirements. than.
Unusual heavy rains occurred in late March and early April, causing heavy flooding in the Hai Lang lowland, the largest rice granary in Quang Tri province. The 56 km long embankment line along the riverbank has the function of preventing minor floods from being overrun by water, flooding the fields.
The drainage and flood control pumping system with more than 80 stations in 12 low-lying Hai Lang communes is also overloaded. The field of nearly 5,000 hectares in the Hai Lang lowland area is submerged in water, when the rice has just worked in the field, it blooms. Rice soaked in water for a long time is rotten and lost white.
Mr. Ho Sen, Director of Don Que Agricultural Service Cooperative, Hai Que Commune, Hai Lang District, said that in the recent heavy rain, the cooperative had to spend nearly 300 million VND to pump out waterlogging but could not save the rice: Now, if it rains and floods, the cooperative's work against flooding is very difficult. The cooperatives are now running out of capital. The anti-waterlogged pump system is too small and cannot run in time. The State also needs to pay attention to support pumping for cooperatives.”
In the recent heavy rain, most of the dike lines to prevent floods in the Hai Lang lowland area were flooded more than half a meter deep, in some parts flooded nearly a meter, water overflowed into the fields. Localities mobilized people to use sand sacks to prevent water from entering but could not be saved.
People in the low-lying Hai Lang area suggested a solution to raise the embankment, to prevent water from entering the fields.
Mr. Phan Van Quang, from Indochina Agricultural Cooperative, Hai Duong Commune, said that before the water flooded the fields, the sandy soil canals were also broken, and the sandy soil flooded into the rice fields: “We have some rice fields. sandy soil channel. Some are made of concrete but not yet finished. All the water overflowed into the field When the dike had not overflowed, that amount of sand had already overflowed into the field. It is necessary to upgrade and repair the system of soil and sand canals and embankments”.
Every time water overflows the dyke, people use temporary cutlery sacks to prevent water from entering the fields.
The low-lying area of Hai Lang district, Quang Tri province is from 0.8 to nearly 1.2 meters lower than sea level. Every time it rains, the water floods for a long time, affecting the sowing schedule. The summer-autumn crop is often flooded and damaged, and farmed fish and shrimp are washed away by floodwaters. In 2008, with funding from the World Bank and the Asian Development Bank, Quang Tri province implemented the Hai Lang low-lying flood control project. The project is to upgrade the 56 km elevation of the embankment with earth, reinforce it with concrete and invest in a system of pumping stations for drainage.
Mr. Duong Viet Hai, Vice Chairman of Hai Lang District People's Committee, said that since the embankment was built, it has prevented minor floods and early floods, and protected the production area of 12 communes in the Hai Lang flood area. However, after an unusually heavy rain at the end of March and the beginning of April, it exceeded the flood prevention capacity of this embankment.
According to Mr. Duong Viet Hai, after each annual rainy season, the riverbanks are severely eroded, with a section of landslide close to the foot of the embankment, forming a cleft palate. The talum roof along the embankment is paved with concrete slabs that have cracked and slipped into the river bed: “During the use process, the dike route has also deteriorated. In the coming time, it is suggested to the superiors to pay attention to upgrading the level. embankment, upgrading irrigation and drainage pumping systems to ensure flood prevention and crop protection for about 5,000 hectares in the Hai Lang lowland area.
The dike line to prevent floods in Hai Lang lowland area has been heavily eroded in many sections.
A representative of the Quang Tri Province Irrigation Sub-Department said that in the past, when building dikes to prevent floods, the consulting unit had also calculated carefully. Now, if the dike is raised to prevent flooding of the fields, it will lead to heavy flooding in residential areas in the rainy season. The current solution is dredging alluvial grounds, clearing channels to create streams to ensure flood drainage. The Ministry of Agriculture and Rural Development is also studying the construction of O Lau Thuong reservoir in the upstream O Lau river basin, with a capacity of over 90 million m3. When this irrigation reservoir is put into operation, it will regulate water storage, cut floods and provide water for irrigation and daily life for 12 low-lying Hai Lang communes.
Ms. Nguyen Hong Phuong, Deputy Director of the Department of Agriculture and Rural Development of Quang Tri province, said that the province is re-evaluating the capacity of dike lines and drainage pumping systems to have more effective solutions: For the low-lying areas of Hai Lang district, it is necessary to study and comprehensively re-evaluate the capacity of the dike system to prevent floods in low-lying areas in order to have solutions to improve the capacity of inundation and drainage, especially for anomalous floods occurring in the rainy season. production point.