In the first part of the 20th century, the mere conversion of land to rain fed agriculture in southeast Australia and southwest United States led to significant increases in recharge and groundwater storage (Taylor et al., In central Spain, intensive groundwater pumping in the Upper Guadiana Basin has contributed to a net increase in water availability for consumptive use (Llamas and Garrido, 2007). Such a mechanism is bound to be found especially in areas with shallow unconfined aquifers with rapid recharge.