Multi-electrode measurements at Thai Binh dikes (Vietnam)

About 7000 km river dikes and sea dikes have been built in the northem provinces of Vietnam. Annually, Vietnamese govemment and people have spent a lot of money for maintenance and protection of the dike system against flooding. Nevertheless, breaks of the dikes still happen, which have serious consequences. The instability of dikes results from defects, termite nests, seepage effects, or distorted dike foundation. The origin of these effects is usually hidden in the dike's body or foundation. It is not directly visible. Methods of dike monitoring are necessary to assess the stability and the state of the dike.