Mameyes River Floods (IMAGE) University of Pennsylvania Caption Puerto Rico's Mameyes River experiences frequent flash floods in which water discharge can increase 100-fold over normal levels. These images of the same section of river (with the identical tree marked in each for reference) show how dramatically river flow can change. Yet a study by researchers from the University of Pennsylvania shows that these events have a much smaller contribution to erosion than might be expected. Credit Colin Phillips Usage Restrictions In context of reporting 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.