Field Drainage Infrastructure (IMAGE) Iowa State University Caption This photo shows the amount of drainage infrastructure that might exist under a typical farm field. Drainage keeps soils dry enough for farmers to cultivate crops in soil that might be too wet otherwise. Credit Michael Castellano Usage Restrictions None 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.