[Acoustics] Q differences

[William R Brazelton]

Dave,

There can be slight differences between the "field Q (that collected onsite
in Acquire)" and the Q results in Playback. Thus, it's very important that
you review your data in Playback; some users even refer to the Q directly
obtained in Acquire as the "unadjusted Q". Once the files have been run
through Playback , you'll find the discharge results to be stable.

Regards,

Bill Brazelton
USGS, WRD, Sacramento Field Office
8550 23rd Ave.
Sacramento, CA. 95826
(916)381-0207



                                                                                                                                            
                      "Huston, Dave"                                                                                                        
                      <dwhuston at water.ca.gov        To:       <acoustics at simon.er.usgs.gov>                                                 
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                      Sent by:                      Subject:  [Acoustics] Q differences                                                     
                      acoustics-admin at simon.                                                                                                
                      er.usgs.gov                                                                                                           
                                                                                                                                            
                                                                                                                                            
                      07/21/2003 11:39 AM                                                                                                   
                                                                                                                                            
                                                                                                                                            




Hi all,
        We're using a 1200 kHz RDI Workhorse to collect Q data at various
sites within the Sacramento-San Joaquin Delta.  When looking at our
transects in Playback mode I noticed that the Total Q is slightly different
than the Total Q displayed in Acquire mode after our end edge estimate has
been entered (written down as field notes).  Have any of you out there
experienced slight differences (eg. 3 to 10 cfs differences) between your
Acquire mode field noted Q data and Playback Total Q?  I know I'm using two
different computers (field laptop and office desktop), however I'm using
the same version of WinRiver (1.05).  Cheers,





Dave Huston, PE
Department of Water Resources
Central District
3251 S Street, Room E-25
Sacramento, CA. 95816
(916) 227-7583