Irrigation canal - cotton field (IMAGE) University of Oklahoma Caption A cotton field in southwest Oklahoma receives water from a field ditch, part of an extended network of irrigation canals that take water from Lake Altus to about 40,000 acres of irrigated land. Credit Saleh Taghvaeian, Oklahoma State University Extension. Usage Restrictions None 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.