Goundwater pollution has become a great concern. Precipitation is a driving force for chemical pollutants movement from soil to groundwater systems. Therefore, the amount and spatial distributions of precipitation are important information to estimate and predict groundwater pollution., However, in most cases, the network of precipitation measuring stations is sparce and available rainfall data are insufficient to characterize high variability of precipitation spatial distributions. As a useful tool, geostatistics can be applied to estimate precipitation in unmeasured areas. In this study we used geostatistics to estimate precipitation spatial distributions in Wyoming. Coupling with numerical models, we utilized the precipitation distributions as input to study the rainfall impact on the groundwater pollution of the state.
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