A Surface Water Withdrawal (SWW) structure installed at Round Butte Dam—part of the Pelton Round Butte Hydroelectric Project on the Deschutes River in Oregon—allows the powerhouse to discharge a blend of warm surface water and cool bottom water. It was designed to enable the dam to meet temperature standards and provide surface attraction velocities that enhance the collection and downstream transport of juvenile migrating fish. When resulting conditions did not meet targeted expectations during certain months of 2012 and 2013, Pacific Northwest National Laboratory (PNNL) under contract to Portland General Electric was asked to conduct a study to determine whether the SWW structure is functioning as designed and to develop revised guidance for SWW operation and the blending sequence, as needed. This report documents the study results.
Revised: July 5, 2016 |
Published: December 31, 2015
Citation
Xu W., and T. Khangaonkar. 2015.Temperature Model of the Pelton Round Butte Hydroelectric Project Reservoirs. . PNNL-25094. Richland, WA: Pacific Northwest National Laboratory.