White, P.A. 1993 Automated resistivity monitoring system for the measurement of ground water flow direction and velocity. Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 93/42 iv, 78 p.
Abstract: An automatic data recording system was devised for monitoring the passage of a salt water slug in ground water using the resistivity rectangle monitoring array. This system is based around ABEM resistivity equipment, a 48 channel logger, and an electronic switching interface built for the project. Software for down-loading and analysing recorded data is described. A trial of the automatic recording system at a test site in the Rakaia River bed showed that the method measures ground water flow in a similar direction to that previously measured by three other resistivity monitoring array experiments at the same site. Seepage velocity estimates were also similar: automated resistivity rectangle - 460 plus or minus 60 m.day-1 , Schlumberger - 360 plus or minus 40 m.day-1 , Werner - 550 plus or minus 70 m.day-1 and down hole electrode array - 420 plus or minus m.day-1. (auth)