Aging Trans-Canyon Pipeline (IMAGE) Geological Society of America Caption Breaks frequently occur in the aging trans-canyon pipeline, whose deliveries to the South Rim are necessary to meet the needs of the park's six million annual visitors. Photo taken May 25, 2012. Credit Credit National Park Service Usage Restrictions Credit National Park Service. 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.