The Red River delta is located in Northern Vietnam with an area of around 15,500 km2 and a population of nearly 20 million people. The delta is protected by approximately 3000 km of dikes which are classified into four grades from III, II, I to “special”; and each dike type attains a different level of safety. In the past, most of the dikes, which were not high enough, failed mainly due to overflowing; therefore the area was usually threatened with flooding. Nowadays, as a result of many measures that have been imposed in the delta such as strengthening the dike systems, constructing the dams in the upstream river for multiple purposes, the flood risk in the area is reduced significantly. In this paper, the authors compare the different levels of safety in the past with those of the present situation by using Plaxis code that includes several material models.