Fracture Zones, Aquifer Testing, and Scale Effects: Consideration in Fractured Bedrock Aquifers of Southwestern British Columbia

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Characterization of groundwater flow regimes in fractured bedrock aquifers on Southern Vancouver Island and the Gulf Islands of British Columbia are presently based on simple hydraulic testing methods and analytical models. Transmissivity, storativity are derived from porous media (radial flow) analytical models that do not fully represent the more complex boundary conditions inherent to fracture bedrock aquifers. Geological and horizontal loop electromagnetic (HLEM) surveys were used to characterize the lithology and structure of a fractured limestone/argillite aquifer of low porosity, and to identify hydrostratigraphic and hydrodtructural units and their associated boundary conditions.

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