WARNING NOTE:  A bias has been identified in ADCP current
velocity data from July '97, October '97, and June '99. 
This bias was caused by a filtering bug in ADCP
configuration files, and appears to amplify velocities.  For
the time being, it is only safe to trust these velocity data
for distinguishing between peak flow and slack, ebb and
flood.  For more details, contact Philip Orton,
orton@ese.ogi.edu.  We will examine this problem in more
detail at a later date, probably late 1999.