Irrigation Performance Connection to Water Quality in Big Creek

Due to new technologies and improved water management strategies, sprinkler irrigation systems are becoming more common in Utah and nearby areas. These systems are generally thought to be more efficient, but their effects on water quality are not well understood. This study focuses on the Big Creek watershed, which flows into Bear Lake—an area where water quality concerns are increasing. The purpose of this research was to explore how different irrigation systems—sprinkler and surface—affect both water use and water quality. Field tests were conducted to measure how evenly water was applied and how efficient each system was. Water and soil samples were collected before and after the irrigation season to assess changes in salinity and nutrient concentrations in both the fields and the creek. The results showed that sprinkler systems were more efficient and applied water more evenly. Surface irrigation fields had more variation, which may lead to increased runoff and nutrient movement into waterways. Although there were no large differences in soil nutrients, some water quality indicators—such as sodium and sulfate—suggested that irrigation type and seasonal variability can influence return flow water quality. This study helps improve our understanding of how irrigation choices affect the environment and provides valuable information for enhancing irrigation practices while protecting Bear Lake's water.