Publication Summary

Since 2002, the Department of Ecology has operated 14 flow gaging stations in the Entiat River basin. In this study, regression modeling tools were developed using the hydrograph separation method to predict streamflows for these stations from flow data at two U.S. Geological Survey stations. The quality of the regressions was evaluated and reported. Recommendations were provided for use of the modeling tools and for future work.

Since 2002, the Washington State Department of Ecology (Ecology) has operated 14 flow gaging stations in the Entiat River basin.

The goal of this project is to identify modeling tools for determining streamflows in the Entiat River basin and to evaluate the quality of those tools. These tools could serve as alternative methods to support Ecology and the Entiat Watershed Planning Unit in meeting overall flow monitoring goals for the basin.

For this study, Ecology developed regression modeling tools using the hydrograph separation method to predict flows for these stations from flow data collected from 2002 through 2008 at two U.S. Geological Survey stations. The quality of the regressions was evaluated and reported.

Recommendations are provided for use of the modeling tools for future flow assessment needs in the Entiat basin and to guide Ecology in making decisions about the use of agency flow gaging resources statewide.