Water-filling flood dams (WFD) are designed to organize prompt and reliable protection of vital facilities and industrial enterprises from flooding. One 25-meter WFD replaces 1000 sandbags, which does not require a lot of time, manual labor and large material costs when laying. It takes no more than half an hour and low labor costs to install one structure of reservoir dams, which becomes simply necessary in conditions of a shortage of specialists when dealing with emergency situations with the water element.