Rio Descoberto (IMAGE) Helmholtz Association Caption This is the Rio Descoberto dam. Until now, more than 90 percent of drinking water in the federal district has come from the Rio Descoberto dam, 25 km from Brasília, and from the Rio Paranoá. Credit Patricia Roeser/UFZ Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.