![A person walking on a streambank](/sites/iowageologicalsurvey.uiowa.edu/files/2023-01/IMG_0702-225x300.jpg)
Eroding streambanks contribute a third or more of the phosphorus export from the state, according to estimates from ground-breaking research led by Keith Schilling and Matthew Streeter from the Iowa Geological Survey at the University of Iowa, along with co-investigators from Iowa DNR, Iowa State University and USDA.