WWRC 88-03
Evaluation of Procedures to Measure Intragravel Water Velocity in Streambeds
Abstract
Four techniques for measuring intragravel water
velocity (IWV) in streambeds and salmonid redds were evaluated
for accuracy, precision, and reliability for field application by
research and management agencies. The Mark VI dye dilution
technique (Terhune 1958) was correlated (P < 0.05) with IWV but
its precision was insufficient to consistently distinguish
between IWV's of 0-50 cm/h. Time-of-travel techniques
demonstrated potential for measurement of undisturbed substrate,
but were not reliable in field conditions. Calculations with
mini-piezometers (Lee and Cherry, 1978) were not correlated with
IWV, and the method of Bovee and Cochnauer (1977) was not
correlated with IWV estimated by Mark VI dye dilution. Because of
measurement imprecision, natural variability within the
substrate, and poor understanding of its importance, field
measurement of IWV is not recommended for monitoring the
incubation environment of salmonid embryos.
88-03 Table of Contents
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