Water quality and trophic state of a tropical urban reservoir for drinking water supply (Juiz de Fora, Brazil)

Abstract

2015) Water quality and trophic state of a tropical urban reservoir for drinking water supply (Juiz de Fora, Brazil), Lake and Reservoir Management, 31:2, 134-144, AbstractBucci MMHS, Delgado FEdaF, and Oliveira LFCde 2015. Water quality and trophic state of a tropical urban reservoir for drinking water supply (Juiz de Fora, Brazil). Lake Reserv Manage. 31:134-144.The Dr. João Penido Reservoir is an 80-year-old tropical impoundment that serves as the main drinking water supply for the city of Juiz de Fora, Brazil. The reservoir is an important environment for the region, serving as a study site for the scientific community. The main objective of this research was to calculate quality indices for water and the trophic state of the reservoir. We performed physical-chemical and microbiological analyses on water samples collected at 5 points in the reservoir between July 2011 and March 2013, a period that characterizes both dry and rainy periods. The parameters analyzed were water temperature, dissolved oxygen, pH, turbidity, total solids, biochemical oxygen demand, nitrate, total phosphorus, chlorophyll a, thermotolerant coliforms and total coliforms. Indices modified for tropical waters, the Water Quality Index (WQI Igam ) and the Trophic State Index (TSI Lamp , a variation of the Carlson Index typically used for temperate zones) were calculated for each sample. The results showed the prevalence of a "mesotrophic" state and a "medium" level of water quality in the Brazilian reservoir. It is likely that the age, forms of use, and occupation of the watershed have produced negative impacts on the aquatic ecosystem over the last 80 years. Water quality clearly demonstrates the safety and environmental health of a watershed. This study presents data on the water quality and trophic state of the Dr. João Penido Reservoir and provides guidelines for developing and implementing an integrated management plan for the preservation of its watershed.

Correlations chart: Tool to analyse the dynamics of water quality parameters

“…In the catchment of the reservoir, P6, erosion was observed along the banks, which was also described by Bucci & Oliveira (2014) and Bucci et al (2015). According to Figure 3F, the nutrients NH 4 + , NO 2 -, NO 3 -, TN, TSS and OC had correlations with 0.01 significance while conductivity, COD, PO 4 3and TP had correlations with 0.05 significance.…”

“…Among these are monitoring physico-chemical and biological parameters, in addition to biological indicators that are recommended and may complement the interpretation of the results (WFD, 2000). In analysing and interpreting the results, simpler analyses such as the Framework Conformity Index (CCME, 2001) was used; Water Quality Index (Bucci & Oliveira, 2014); boxplot graphs (Rocha et al, 2016); in addition to more complex analyses such as multivariate analysis and correlation tables (Bu et al, 2014;Azhar et al, 2015;Bucci et al, 2015;Rocha & Pereira, 2016;Trindade et al, 2017), which have higher complexity for interpretation.…”

Análise Morfométrica Da Bacia Hidrográfica Do Córrego Manhuaçuzinho, Minas Gerais

“…Essas mudanças afetam diretamente a dinâmica da água nas bacias hidrográficas. O uso inapropriado do solo degrada a superfície do terreno (RAMOS et al, 2014;BERTOL et al, 2015), diminui a sua capacidade de infiltração e reduz a qualidade da água (DESSIE & BREDEMEIER;2013;BUCCI et al, 2015;NAUBI et al, 2016).…”

Análise de metais, agrotóxicos, parâmetros físico-químicos e microbiológicos nas águas da Represa Dr. João Penido, Juiz de Fora, MG

“…Alguns trabalhos já foram desenvolvidos neste reservatório (Pereira, 1991;Rocha e Branco, 1986), porém, o primeiro estudo que apresentou o monitoramento mensal da qualidade da água por 1 ano (2009)(2010), incluindo a avaliação do Índice de Qualidade da Água (IQA) e Índice de Estado Trófico (IET) foi o desenvolvido por Bucci (2011), resultando em publicação científica (Bucci e De Oliveira, 2014). Dando continuidade a este trabalho, Bucci (2015) realizou outro estudo na represa, aprofundando o conhecimento no que diz respeito à investigação sobre a presença de metais e agrotóxicos na avaliação da qualidade hídrica entre 2011-2013, além de ter continuado o monitoramento do IQA e IET do reservatório (Bucci, 2015;Bucci et al, 2015). O presente estudo teve como objetivos: monitorar parâmetros físico-químicos, microbiológicos e investigar a presença de metais e agrotóxicos em amostras de água da represa; verificar se os resultados atendem às legislações pertinentes (Brasil, 2004;2011;CONAMA, 2005); verificar a correlação entre os parâmetros analisados em análise estatística dos dados obtidos.…”