Electronic Data Collection and Analysis System
Yin Foo, Des; Foley, Margaret
E-Publications; PublicationNT; E-Books; Report ; 39/1992
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Power and Water Authority
Report ; 39/1992
Check within Publication or with content Publisher.
Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 165 of 192. C4.3 ANALYSIS Compare tt.e logged head data to the set depths at the manually recorded times, by finding the dif.ferences between them at each of the common times. The most convenient ~lay to do t~Ls is to use as outlined in C2.3 above. Approximately 95% of the differences should be within that found fro::n the previously applied standard test of the system's accuracy (C2). II the differences are significantly high, find their mean and standard deviation. If the standard deviation is close to that found in the standard test, and if on recalibration (of logged by manual data over the test period) the "s" parameter (as in C2. 3) is found to be between 0.999 and 1, then the most probable cause of t.he discrepancies is that the transducer depth was incorrectly set. Check the SWL measurements from before and after the test period. The short test results found after the logging period should also be examined, before any recalibration of the logged data to be processed is considered. If there is serious doubt about the accuracy of any data to bH used, the system should be returned for a full standard test. If the "s" and "0" values found from a subsequent standard test confirm those from both the short field tests, the logged dat.a to be processed should be recalibrated at the editing stage,. and where possible the corrected calibration param'~ters entered in the logger .