Technical Report No. 23
AN ELECTRICAL RESISTIVITY PROFILE FROM MAHUKONA TO KAWAIHAE, HAWAII
William M. Adams
HIG Series, HIG-WRRC – I – November 1968
ABSTRACT
In order to locate the restively optimum sites for drilling exploratory holes for fresh water, an electrical resistivity survey was conducted among the new Mahukona-Kawaihae Road on the west flank of the Kohala Mountain. Two resistivity soundings were run using the Schlumberger spread configuration to determine a satisfactory spacing for a Wenner profile spread. Using an “a” spacing of 275 feet, a profile of 209 stations was run using the Wenner spread configuration. The data were correlated with elevation at 0.41, so a procedure for removing the elevation effect from observed apparent resistivity was developed. The procedure is probably uniquely applicable to insure environments. Based on the reduced resistivity profile, four relatively optimum sites for additional exploration, such as by drilling, are specified. There is not, however, any interpretation of the data that can definitely indicate the occurrence anywhere on the profile of age underground reservoirs of fresh water. This is because the interpretation-of profile data is essentially relative, not absolute.