In this article, I focus on the context in which levees were constructed on the Lower Danube, along the Bulgarian–Romanian border. I argue that after World War II, while the two states shared the management of the river in this region, Romania pursued a techno-nationalist hydraulic policy, which led to the complete damming of the left bank of the Danube with levees. Bulgaria also succeeded in building levees on its side of the Danube, that is the right bank of the common border; however, Bulgaria used different technologies and its building works proceeded at a different pace. Techno-nationalism as delineated in this article considers nation-states as basic units in the analysis of technologies. Technological development is not a flowing process, as it becomes entangled with the interests of nation-states seeking legitimation. Hydraulic technology may strengthen nation-states, and in some circumstances leads to the emergence of nationalistic ideologies.
