Seleção de variáveis em análise por envoltória de dados na análise da eficiência do instrumento da cobrança pela água bruta no setor do abastecimento público nas bacias cearenses por meio da ferramenta computacional SIAD (Sistema Integrado de Apoio à Decisão)

Abstract

The charge for water in Ceara began in 1996, taking as a basis for calculating only the actual consumption, without distinguishing between capture and consumption. It is known that the factors which can be used in an efficiency analysis of the collection instrument in a watershed are multiple. For an evaluation that simultaneously considers various factors, a multi-criteria analysis model is used. The main objective of this study is to conduct an analysis of the relative efficiency of charging for the use of raw water from the public supply sector in Ceara´s basins through the application of data envelopment analysis in order to obtain a diagnosis of the sector in all the state. The DEA can be defined as a mathematical programming tool nonparametric which is used to compare efficiency (performance) of multiple units, which perform similar tasks. The measured efficiency was obtained by the DEA modeling variable scale return (BCC model), with guidance product. Charges in Curu and Metropolitana basin, a total of 11 basins, presented with maximum relative efficiency (exceeding 100%). The charge tool around the state can be considered efficient, since the average efficiency of the analyzed set was equal to 91.04%%. The research developed in this work could be very innovative in applying the EDA tool to evaluate the performance of an instrument of public policy, such as charging for raw water. the use of this scientific methodology to support the process of decision making in the management sector of water resources for the performance indicators calculation of their instruments is strongly recommended.