Central pivot irrigation system (IMAGE) Virginia Tech Caption A central pivot irrigation system using groundwater from the High Plains (Ogallala) aquifer in southwest Kansas. This aquifer has been heavily pumped for decades, producing large water-level declines that threaten its viability as a continuing resource for irrigated agriculture. Credit James J. Butler for Virginia Tech Usage Restrictions No restrictions. License Public Domain 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.