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Development of a Tool for managing groundwater resources in semi-arid hard rock regions. Application to a rural watershed in south India.

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Until recently, aquifers located in hard rock formations (granite, gneiss, schist) were considered as a highly heterogeneous media, and no adequate methodology for groundwater management was available. Recent research studies showed that when hard-rocks are exposed to regional and deep weathering processes and when the geology is relatively homogeneous, a typical hard rock aquifer is made of two main superimposed hydro-geological layers each characterized by quite homogeneous specific hydrodynamic properties: namely the saprolite and the fissured layers. Therefore, for these cases, hard rock aquifers can be considered as a multi-layered system.

 

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