Análise por envoltória de dados utilizada para medir o desempenho relativo da cobrança pelo uso da água nas bacias hidrográficas do Estado do Ceará

Abstract

In Ceará charging for water began in 1996, taking actual consumption alone as a basis for calculation, without distinguishing between capture and consumption. It is known that multiple factors can be used in an efficiency analysis of the collection instrument in a watershed. For an evaluation that simultaneously considers various factors, a multi‑criteria analysis model is used. The main objective of this study is to evaluate the relative performance of the collection in the main categories of use of state basins by implementing Data Envelopment Analysis. Thus the BCC (Banker, Charnes ¨; Cooper) model was applied with product‑based orientation for the calculation of the relative performances, with the help of the SIAD (Decision Support Integrated System) computational tool. The analysis showed that the industrial sector throughout the state stands out among sectors, with an average efficiency of approximately 92.6%. On the other hand, supply and irrigation have a low average efficiency, equal to approximately 45.9% and 29.9%, respectively. The model was effective as had been proposed, that is, it was able to obtain a diagnosis throughout the state regarding collection efficiency in the main categories of use. Hence, the use of this scientific methodology to support the decision‑making process in the water management sector is strongly recommended in order to obtain performance indicators of that instrument.