Appendix B. U.S. Army Corp of Engineers Computed Unregulated Streamflow Data Time Series

Unregulated streamflow data time series for the South Fork McKenzie River (14159500), Blue River (14162200), and McKenzie River near Vida (14162500) were computed using the equations below developed by the U.S. Army Corps Engineers. The streamflow data time series for the three sites are included in the Reach3.xls, Reach5.xls, and Reach7.xls Excel files described in appendix A.

South Fork McKenzie River (14159500)

Water year 1936–1947

Streamflow calculated by correlation between stations 14159500 and 14147500 y = 82.31 + 0.97399x, R=0.97898

Water year 1948–1962

Straight streamflow from station 14159500, no DA factor needed

Water year 1963–1987

Streamflow calculated from station 14159200, DA factor=1.294

Water years 1988–1994

Same as first time period, correlation, between stations 14159500 and 14147500

Water years 1995–2000

Calculate station 14159200=0.320a + 91.1, where a=14148000–14145500

Inflow = 14159200 * 1.294

Water years 2001–2004

Inflow=station 14159200 * 1.294

Blue River (14162200):

Water years 1936–1964

Flow from station 14162000, DA factor=1.164

Water years 1965–2003

Flow from stations 14161100 and 14161500

DA factor of 1.38 applied to station 14161100 only, then added to straight values of 14161500

Water year 2004

Calculate station 14161100=(station 14161500 * 2.136)–5.4

Inflow=station 14161100 * 1.38+station 14161500

McKenzie River near Vida (14162500)

/MCKENZIE/VIDA/FLOW-LOC INC//1DAY/ HEC5 COMPUTED/

• Computed using Blue River and Cougar Outflows
• Blue River: water years 1936–1966: Used computed Blue River Inflows as Outflows (dam was not constructed yet)
• Water years 1967–2008, station 14162200
• Cougar: water years 1936–1947: Used computed Cougar Inflows as Outflows (dam was not constructed yet)
• Water years 1948–2004, station 14159500
• Routing factors for both: 0.84, 0.16

First posted February 8, 2010