Electronic Data Collection and Analysis System
Yin Foo, Des; Foley, Margaret
E-Publications; PublicationNT; E-Books; Report ; 39/1992
1992-08-01
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Date:1992-08
English
Power and Water Authority
Darwin
Report ; 39/1992
application/pdf.
Check within Publication or with content Publisher.
https://hdl.handle.net/10070/229024
https://hdl.handle.net/10070/673447
Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 105 of 192. 42 RECOl\(IMENDATIONS There are many decisions to make in putting together a system for pump test data acquisition. These decisions must be made by PAWA personnel based on the Infonnatlon contained in this report and the accompanying product brochures. This section contains a descripUon of my own leanings based on my present knowledge of fieJd conditions to be expected by PA\VA pump test staiT. Obvlously. those who have experienced these conditions, and who are aware of the many other constraints on these decision.'>. may wish to review these recommendations. it should be pOinted (out that those around Australia with whom I have discussed pump test data acquisition and who have systems of thdr 0\\'11. stress the e,"perimentaI nature of setting up such a system. No system is perfect, and as tiley gain more experience and dilIerent pieces of eqUipment come onto the market. their perceptions of what constitutes the best system changes. As these perceptions differ from person to person, a large part of the choice of system components seems to be inliu lion, or previous experience with a particular piece of equipment TIle decisions that PAWA staff must make on what to buy in order to automate their data acquisition must he considered in this light Though deCisions should be as well-lnfonned as possible, a decision will only have been proved to be correct after the resulting system has been successfully operational for some time. Water Level Sensors The choke here is between pressure transducers and capacitance water level sensors. ObviOusly, as the ]"ngest of the laiter items is only 6m. pressure transducers must be used In the pumped bore and close observation bores. Although capacitance sensors have, on paper, a belter accuracy than pressure transducers, in practice -the perfonnance of the flexibie ones which would be used dowrJrole is degraded by dirt. deposits on the teflon tub,! and the possibility of touching the side of the hole; the latter phenomenon will become a greater probJem in deeper holes. Also, therr performance is affected by caSing. Although West data (the makers, of the flexible sensorsi assure me that (he calibration ollset and not the sCHling jf affected. problerl:ls could arise if the water leveI {.:ills through a casing collar or a reuuctiun in casing uialneter. Because of all these drawbacks. I prefer to use pressure transducers in all bor,es. Ga:gge ()r Absolute lithe conditions encountered by PAWA staff were such that the water table was never more than 10m deep. and drawdo",,'lls wouid never exceed 20m, then I wouid recommend that