Análise da demanda de água e esgoto de Canela e Gramado - RS, pelo método de avaliação contingente

Abstract

This present work shows an valuation about the introduction of sanitary drain treatments and the piping of water courses in Canela and Gramado, cities located in Rio Grande do Sul State. To determine the feasibility of these projects, it was used the ‘Contingent Valuation Method’ (CVM), through the Turnbull Distribution. The CVM looks for the valuing of public and environmental goods for which there is no prices for on the market. Because of that, it is created a hypothetical market, with several streps of prices and through questionnaires, there is an evaluation of the main costumers about the ‘Disposition to Pay’ (DP) for the offered services. By the results, it is identified the people who are able (prepared) and the ones that are not able to pay, and with the ones that are not able to pay, we can have a stimative of DP, through the Turnbull Distribution. The developing of these projects, it was selected a sample of three hundred (300) families in Canela and Gramado, classified into four (4) sets of values. The geographic distribution of the sample was determined by the Zones definid by the Technical Engineering Services (STE) at the Companhia Riograndense de Saneamento (CORSAN), in maps of the water and drain courses. Inside each zone, the choice of houses to be interviewed was aleathory. On the questionnaries were avaiable questions related to the introduction of the treatment, with the respective streps of prices. It was noticed, in Canela, that 61,67% of the interviewed families are prepared to pay for the offered services and the obtaining of DP was stimated in R$ 15,47 per family, with a standart divert of R$ 1,45, while in Gramado, 65% of the families are prepared to pay and the DP was stimated in R$ 16,27 per family, with a standart divert of R$1,52.