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Measuring groundwater extractions is central to adequate groundwater management in agricultural basins Groundwater pumping records are often subject to considerable uncertainties particularly in the case of arid and semiarid settings where irrigation is the most important water use In most cases this is due to the difficulties involved in locating and monitoring all wells We describe the estimation of groundwater pumping by coupling the water table fluctuation method with the groundwater balance equation This is demonstrated through its application to the Mancha Occidental aquifer Spain an area subject to intensive pumping for irrigation since the early 1970s A sensitivity analysis is conducted to evaluate the effect of relevant hydrogeological parameters namely specific yield as well as the most appropriate theoretical semivariogram to calculate yearly storage variations within the system Results are validated in the light of official pumping estimates (c) 2010 Elsevier B V All rights reserved