Climate variability and groundwater resources..

It is very well-known that the variability of precipitation produces variability in the behaviour of the unconfined aquifer. Abundant rains cause the recharge to the unconfined aquifer and drought generates the decrease of its levels. The goal of this paper is to study the relationship between the climate variability and the groundwater resources. This work is focused on the Pampa Húmeda, in Argentina, and uses methodologies characteristic of climatology to analyse some aspects of the recharge variability and relate them to the climatic variability. This offers new and better solutions for control management and the preservation of integrated water resources. The extensive planes of the region of the Humid Pampas are, without doubts, one of the most important agricultural regions of the World, where the groundwater is the only available resource for watering, industries and human consumption. In the results a very good coincidence was found between the atmospheric variables and water resources. The tendency changes and jumps in the mean showed the same tendency and on coincident dates. Finally, it can be concluded that the unconfined aquifer in the Pampa Húmeda has become an important element for studying low frequency variability, behaving as a natural filter of high frequency variabilities.