Abstract
The Ribeira de Iguape River, one of the most important rivers in the Brazilian southeastern state of São Paulo, has sources in the Paraná state, drains from Northwest to Southeast between São Paulo and Paraná states through the Ribeira Valley and reaches the Atlantic Ocean at Iguape, in the Southern coast of the first state. During almost the entire 20th century, the Ribeira de Iguape Riv…