WATER PROSPECTING METHOD AND APPARATUS

摘要

A method of prospecting for underground water (12) at an over ground test site comprises the following steps. Arranging at least three electrical probes (13, 14, 17) in the ground at spaced positions along a straight line. A first set of three probes is selected comprising a first probe (13), a second probe (14) and a third probe (17) between them. An electrical potential (15) is applied across the first and second probe (13, 14) to cause an electrical current (16) to travel through the ground between the first probe and the second probe. The potential difference between the first probe (13) and third probe (17) and between the third probe (17) and second probe (14) is measured. The measurement is repeated for a further set of three probes displaced along the straight line from the position of the first set of probes. Comparison of the relative magnitude of the same measurements taken for the first and second set determines the presence of underground water.