Tree core (IMAGE) University of Texas at Austin Caption Researchers pull a fresh wood core from a bald cypress tree growing along Waller Creek. An analysis of growth rings in the core revealed that the Waller Creek trees have always had a dependable water supply. This finding suggests that Waller Creek has long been a conduit for water leaking from surrounding pipes. Credit The University of Texas at Austin Jackson School of Geosciences Usage Restrictions Credit image 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.