Análise de sensibilidade dos parâmetros do índice de qualidade de água (IQA)

Abstract

Quality of water for public supply is one of the hottest topics charged by society since the 70s, making experts in the field would create an index that represents a quality standard to determine the level of treatment which the raw water should be submitted. To determine this index, scientists from the National Sanitation Foundation (NSF) chose nine parameters that represented the water quality, assigned weights to them and instituted curves indicating the quality of each and from them determines if the Water Quality Index (WQI) that ranks the quality in five groups (excellent, good, medium, bad and very bad). With the objective to facilitate the calculation this index, the Mineiro Institute of Water Management (IMG) developed through the system of calculation water quality (SCQA) equations for each parameter based on the curves established by NSF. In this study we analyzed the sensitivity of each parameter in the band change classification WQI, determined by the equations of SCQA. The analysis showed that, depending on the transition band of the WQI, certain parameters have more influence than others in this transition.