This paper proposes a Water Access Index (WAI). Using this tool, decision-makers can identify and prioritize areas that need state intervention to develop actions to guarantee rural population access to water. Thus, was carried out is a case study, rural communities in the semi-arid region of Brazil to validate the suggested method. The WAI is based on a combined method of multicriteria decision analysis (MCDA), Geographic Information System (GIS), cluster analysis (CA) using Ward's agglomeration method and participation of rural inhabitants. The data for calculating the WAI were obtained by conducting interviews following a script of themes in the structured questionnaire closed to 370 residents of the communities evaluated. To calculate the WAI, weightings were used, in which the scores of the indicators and the weights of the dimensions were determined and analyzed using the Delphi method, what found to be a valid method for calculating the dimensions and indicators weights. Due to difficulty of rural population to have water access and suffer from drought, the proposed model showed appropriate to conduct a robust and well-structured decision-making. The main contributions were the study in region suffering from drought and difficulty in water access, as well as the combination of MCDA, SIG, CA and participation of rural inhabitants methods to aid in this problem. For use in other areas, researchers need to conduct public and specialized consultations to adjust the dimension weights, so the WAI method can estimate the water access situation and generate maps anywhere in the world for decision-making.
Keywords: Delphi method; Drinking water; Geographic Information System; Multicriteria decision analysis; Water shortage..
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