Mud line on houses after 2018 mudslides (IMAGE) University of Pennsylvania Caption The 2018 mudflows, which followed a fire and then heavy rain, were powerful and destructive. Here, the “mud line” marks how high they flowed into homes in Montecito, California. Credit Douglas Jerolmack Usage Restrictions in context of reporting License Original 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.