Time-Lapse Resistivity and Geophysical Measurements at Dayspring Children’s Village

Summary Using an electrical resistivity array we mapped variations in the weathered subsurface at Dayspring Children’s Village and tentatively identify several significant fractures. The weathered zone is significantly thicker to the west. Time-lapse electrical resistivity data were used to map out variations in moisture between the end of the rainy (April) and end of the dry (September) season. In all the time-lapse difference plots, there is a near surface zone between 8-15 m thick that has consistently lost moisture during the dry season. We interpret a significant increase in resistivity in the deeper zone on the line closest to the trees as being due to depletion of moisture along a fracture from which trees are extracting water.