Abstract
en The uncertainty in the capacity of water supply due to changes in nature and gaps in observations leads to the need for greater efficiency within the water resources management. An examination of the vulnerability of a water system is an essential step in the development of a strategy in the scope of management of drought and water safety. IPCC (2001) divided vulnerability into three main factors: sensitivity, exposure and adaptive capacity. This paper proposes a method to quantify sensitivity to drought through the analysis of social, economic, environmental and hydric aspects. Sensitivity represents the degree of preparedness the system is in, reflecting its ability to respond to changes in the climate, whether beneficial or harmful. It also represents the system's ability to absorb impacts without suffering long-term damage or any significant changes of state (Thomas et al. 2016; Fontaine 2007; Abraham 2006). The study was applied to the states of São Paulo and Ceará, located in southeast and northeast of Brazil, respectively. The states were chosen because they faced during this decade severe water crisis even though they present different climate characteristics and different social dynamic and economic activity.
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