Open Channel (IMAGE) C-Crete Technologies Caption Open channels that carry water can be made with a new cement formulation that will purify the water via sun exposure as it flows toward its destination. Credit U.S. Geological Survey Department of the Interior/USGS Usage Restrictions Give Credit to: U.S. Geological Survey Department of the Interior/USGS 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.