Outorga hídrica sob a ótica da análise multicriterial. Estudo de caso: reservatório Coremas-Mãe d'Água-PB.

Abstract

The water right grant is a fundamental and important instrument to water resources management, as it ensures the quantity and quality control of water uses, as well as the rights of access to the resource. In Brazil, water right grant is ruled by the Federal Law 9.433/97, by specific state laws for the establishment of policies for a system management, such as Paraiba State Law 6.308/96, and by decrees. However, the water right grant is not an instrument of easy implementation or administration because of the increasing demands and conflicting water users’ interests. Moreover, current water right grant studies existing in most of Brazilian states are based on a purely quantitative analysis of the available water resources. However, it is known that the problems of water scarcity are increasing and many river basins have limited the water right grants. In the near future, most of water right grants will have to be reviewed as the water requests are greater than the water availability. Therefore, besides de mere quantity, the water right grant analyses should be based on more restrictive criteria, which take into account aspects such as environmental, economic, cultural and social. A rather complete analysis in this sense can be performed by the multicriterial or multiobjective analysis that present a set of methods to allow the simultaneous handling of several aspects in a decision-making process. In this context, the objective of this study is to examine the influence on the decision making process regarding to the application of a multicriteria method on the best water users rank choice for water right grants concession for the Curema- Mãe D’Água reservoirs system. The PROMETHEE method was used to examine and rank 11 alternatives of water right grants for different water users, which were based on de judgment of 8 criteria. Based on the results, a study of the water demands attendance reliability and the dynamic behavior of the Curema-Mãe D'Água system of reservoirs were performed. It was concluded that multicriterial methods can help decision makers to rank river basin water right grants concession in order to adequate water allocation to water users demands in terms of the priorities of the management or collegiate related sectors, as, for instance, the AESA, CERH, river basin committee, and so on, the ones established in Director Plans or to protect or force the development of certain water related activities that are import for the region.