Results of an investigation of the ground-water hydrology of the lower Elqui river region, Coquimbo, Chile, demonstrate that large supplies of water suitable for irrigation purposes are available from numerous permeable zones in the alluvial deposits which underlie the modern flood plain of the river. Little is known about the configuration or water-bearing properties of the Jurassic or Cretaceous basalts and upper Cretaceous granitic rocks which form the buried floor of the valley.

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