Detection of Groundwater flow zones in low productivity boreholes (Submitted)

Janka Nitsche, Raymond Flynn

    Research output: Contribution to journalArticle

    Abstract

    Conventional methods of detecting groundwater flow zones in open boreholes installed in fractured bedrock aquifers rely on either contrasts in water quality or on significant rates of vertical flow. In low productivity boreholes these methods have proced of limited value. Tracer tests completed in six low productivity bedrock boreholes installed into fresh Precambrian crystalline bedrock revealed measurable dilution, despite very low tranmissivities. Fluorescent tracer profiles generated during discharge pumping permitted identification of the principle zones contributing to flow. High resolution acoustic televiewer strike and dip measurements of fractures corresponding to these zones revealed a consistent pattern of regional lineament trends and suggested a strongly anisotropic flow pattern in bedrock.
    Original languageEnglish
    Pages (from-to)XX
    JournalGroundwater
    VolumeXX
    Publication statusPublished - 2012

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