Brazil's Porto Alegre: a flood disaster waiting to happen

Porto Alegre, the Brazilian metropolis left submerged after torrential rains, had been lulled into a "false sense" of security by a vast but aging system of flood defenses, an urban drainage engineer told AFP.

Leomar Teichmann said a network of dikes, levees and a massive wall was meant to protect about 40 percent of the capital city of Rio Grande do Sul state in southern Brazil, where 150 people have died and hundreds of thousands were forced from their homes.

Teichmann is an engineering...