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Scientific Investigations Report 2008–5093

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5093

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Table 6. Calibrated drag coefficient and lateral-eddy viscosity and differences between model simulated and observed HEC-6 water-surface elevations for five calibrations, Coeur d’Alene River near Dudley, Idaho.

[Abbreviations: m2/s, square meter per second; ft, foot; MAD, mean absolute difference error; (see figure 16 for equation); MD, maximum difference]

Model
calibration
simulation
No.		 Date Dimensionless
drag coefficient
(Cd)		 Lateral eddy
viscosity
(LEV)
(m2/s)		 Water-surface elevation
differences between
simulated (FASTMECH)
and observed (HEC-6)
MAD
(ft)		 MD
(ft)
1 03-26-99 0.0022 0.05 0.037 0.102
2 01-15-99 .0022 .05 .035 .092
3 05-26-99 .0022 .05 .050 .131
4 05-14-97 .0030 .05 .043 .100
5 04-14-00 .0023 .15 .062 .177

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