Croatia managed to successfully combat the amount of water coming in until the night of 17 May, when the Sava river broke out of its levee system in two places along the 210 km line in the eastern part of the country and partially or completely flooded 210 square km of the surrounding area. The unprecedented floods caused widespread power outages, water shortages, damage to the infrastructure, livestock and livelihoods, and displacement of the affected population. The flooding caused three deaths, and, out of the estimated 15,000 people evacuated to the nearby cities and ten temporary collective centres, 7,116 were registered and looked after by the Croatian Red Cross.
On 20 May, the Croatian Government, advised by Director of the National Protection and Rescue Directorate, declared a state of disaster for the Vukovar-Srijem County, and an Operational - Communication Centre was set up in the city of Županja. Croatian Red Cross has been designated as a coordinator for receipt and distribution of the humanitarian aid.
Croatian officials have expressed concern about the impact of the flooding on the numerous mine-affected areas in the region. Many of the flooded areas are multi-ethnic border villages where mine-suspected areas from the 1991-95 conflict had been well marked but not yet de-mined. The fear is that the floods will have displaced both warning signs and the mines themselves.