Description: Using discrete water-quality and streamflow data in Iowa, site-specific and statewide load estimates were calculated for nitrate and total phosphorus using three modeling methods: linear interpolation, WRTDS, and WRTDS-K. Load estimates, and nutrient trend direction and magnitude were compared among the three load estimation methods.

Author: Lindsey Schafer

Author Bio: Lindsey Schafer is a hydrologist at the United States Geological Survey, Central Midwest Water Science Center and is co-located at the Maryland-Delaware-D.C. Water Science Center in Catonsville, Maryland. Her work integrates field sampling, continuous monitoring, and data analysis to improve understanding of water‑quality and water-quantity trends.