 When construction of the dam began, approximately 10,000 families living beside the Paraná River were displaced because of construction.The world's largest waterfall by volume, the Guaíra Falls, was inundated by the newly formed Itaipu reservoir.The Brazilian government later liquidated the Guaíra Falls National Park, and blasted away the submerged rock face where the falls had been, facilitating safer navigation, thus eliminating the possibility of restoring the falls in the future.