Drilling Deep (IMAGE) Columbia Climate School Caption Groundwater in valleys appears to be more likely affected than water further upslope. Credit Yan et al., STOTEN, 2016 Usage Restrictions Credit must be given. 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.