Análise de um modelo de cobrança pelo uso da água bruta no sistema hídrico Coremas-Mãe D’Água.

Abstract

In this paper, we propose to apply and analyze a pricing model for the use of raw water in the water system formed by Coremas and Mãe d'Água reservoirs. This system, which is located in PiancóPiranhas-Açu River Basin, Brazil, is subject to recurrent periods of water stress. The methodology consisted of using the pricing model established for the São Francisco River Basin and verifying the possible money collection for the various uses in the water basin, considering the water withdrawal, consumption and disposal of organic loads components. The Standard Linear Operating Policy (SLOP) was used for the monthly water system balance, considering an observed series of hydrological data of 32 years (1964-1984, 2004-2014). When analyzing the results, it was verified that the system failed to meet demands in 28 out of 384 months (7.29%), which compromises water sustainability and money collection in critical years. With respect to the money collection, it was observed that it is possible to collect an average annual amount of R$ 1,319,037.18, with the sanitation sector being the largest contributor (R$ 773,886.02 per year). Considering the components of collection, it was detected that the highest collection occurred with the disposal of organic loads, in the average annual amount of R$ 807.744,24, followed by the water withdrawal (R$ 326,889.93 per year) and consumption (R$ 184,403.01 per year) components. Finally, taking into account an extrapolation of money collection in the water basin, it was estimated that the values are not enough to enable the full maintenance of a basin agency in the Piancó-Piranhas-Açu river basin.