Abstract

 
 
 Significant changes in the isotopic composition of groundwater in the upper catchment of Rio Guanajuato, Mexico, were detected in two independent sets of samples for 3 % of the 1600 high–production wells in the area. Sampling was done in December 1998 (53 samples), and in July – August 2003 (41 samples). Average deuterium concentration did not change between 1998 and 2003 but the average oxygen–18 concentration suggested a generalized dilution from deep water from infiltrated local precipitation. This regional change occurred within 56 months, indicating a highly dynamic hydrogeologic system. Fast replenishment of aquifer storage, or non sustainable over–pumping of old aquifer reserves, are possible explanations.
 
 
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