A new ground water tracing instrument and its principle

features

and applications are described. Signals from G-M tubes are transported through a 3-wire cable. A low-power liquid crystal scan display circuit controlled by a microcomputer is employed. Both groundwater flow direction and velocity can be determined precisely. The instrument can be used in the survey of many parameters

such as coefficient of permeability

vertical flow

effective porosity

transmissivity

coefficient of dispersion and seepage of dam or reservoir bottom.