Carvalho, Adriana RosaSchlittler, Flávio Henrique Mingante [UNESP]Tornisielo, Valdemar Luiz2014-05-202014-05-202000-10-01Química Nova. Sociedade Brasileira de Química, v. 23, n. 5, p. 618-622, 2000.0100-4042http://hdl.handle.net/11449/27570Water Quality Index (WQI) was used during summer and winter of 1994 and 1995 in the final section of Onça and Feijão streams, downstream Broa Reservoir (São Carlos/SP) to evaluate agricultural and catlleman effects. In Onça stream water quality was acceptable in winter and inappropriate to conventional treatment in the summer. In Feijão stream the water had an excellent quality in winter and good in the summer. A MANOVA (Multivariate Analysis of Variance) has used to discriminate seasons and streams. Correlation (p<0,05) among the variables was tested. Water temperature, turbidity, pH and fecal bacteria are highly correlated and can be one of the factors that cause WQI change by seasons.618-622porwater qualitygrazingagriculturelimnologyphysic-chemical parametersArtigo10.1590/S0100-40422000000500009S0100-40422000000500009Acesso abertoS0100-40422000000500009.pdf8700910376632592