Análise da eficiência do instrumento da cobrança pela água bruta nas bacias cearenses: uma aplicação da fronteira invertida em análise envoltória de dados

Abstract

Water Resource Management is extreme importance to ensure access to all water users. Water resource management policies in Brazil take a management instruments among which a charges for the use of water resources. Many criteria can be used to make analyzing efficiency implementation of the charges for use of water in the river basin. Such an analysis requires the use of a scientific methodology called multicriteria analysis. The main objective of this research is to evaluate relative efficiency, through Data Envelopment Analysis (DEA), instruments of fee for the use of untreated water of main categories of use in the river basin in Ceará state. Thus, it is obtained a general diagnosis of this instrument in all of the State of Ceará. DEA models generally result in a large number of efficient units thus, it was decided to apply the inverted frontier methodology in order to identify and eliminate efficient units who present themselves with false efficiency. Application of DEA for charges for use of water reachedthe objective that it was to obtain a diagnosis of all river basins of the State of Ceará while the inverted frontier method ordered all analyzed UTDs. In general, the charges to industrial units in river basins of State of Ceará showed better results than the others, while irrigation units obtained the worst results.