SIMULATION OF LONG-TERM AVERAGE STREAMFLOW AND NITROGEN, PHOSPHORUS AND SUSPENDED SEDIMENT LOAD IN THE CONTERMINOUS UNITED STATES USING REGIONAL SPARROW MODELS

There is a growing need for information that provides an understanding of streamflow and water-quality conditions throughout the diverse regions of the United States. Understanding these conditions and their drivers can help water-resource managers and policy makers anticipate, prioritize, and manage water supply and water quality. SPARROW watershed models can provide some of this much needed information. The SPARROW (SPAtially Referenced Regression On Watershed attributes) model is a tool that relates in-stream monitoring data to spatially referenced watershed characteristics, including constituent sources and factors influencing land and water transport. SPARROW models can simulate load, yield and concentration at millions of stream reaches as well as describe the sources that contribute to those loads. New SPARROW models were recently developed for five regions of the conterminous United States. These models simulate long-term average streamflow and nitrogen, phosphorous and suspended sediment load and yield. This presentation will provide a summary of the recently developed models as well as an introduction to online mapping tools that will allow users easy access to explore, display and download model results.