Homes behind Stockton Levee (IMAGE) University of California - Davis Caption Homes behind a levee in Stockton, Calif. UC Davis research shows levees can increase the flood risk of structures behind them. Credit California Department of Water Resources Usage Restrictions Provide credit. 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.