The Vinh Long Hydrometeorological Station said salinity levels are rising and are expected to peak on February 27-28.
At the 4‰ threshold, four grammes of salt per litre, a level harmful to many crops, saltwater could penetrate more than 43 kilometres inland along the Cua Dai River, about 56 kilometres on the Ham Luong, nearly 55 kilometres on the Co Chien and over 57 kilometres on the Hau.
At the lower 1‰ threshold, one gramme per litre, intrusion could extend beyond 70 kilometres inland on some branches, affecting areas along the Cua Dai, Ham Luong, Co Chien and Hau rivers.
Authorities have issued a Level 2 natural disaster risk warning for saltwater intrusion.
Officials cautioned that salinity of 0.5‰ or higher may damage crops, livestock and water sources, urging communities located 50-70 kilometres from river mouths to closely monitor levels when operating sluice gates or drawing river water.
The provincial Department of Agriculture and Environment has called on relevant agencies and localities to track updates and implement response measures to minimise potential losses.
