DOI: 10.17265/2159-581x/2015.08.003
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John A. Fitzpatrick, Juan F. Facetti-Masulli

Abstract: Abstract:The Secchi disc is used to obtain the water transparency D and a value for the attenuation coefficient Kt according to Kt = Cx.D -1 where C is a factor estimated supposedly as a constant. Lago de la República, a small reservoir seated on basaltic residual soil laterites rich in secondary sesquioxides of Fe, Al, etc of the Alto Paraná Formation, after rainfalls incorporates significant amount of sediments rich in iron compounds easily hydrolyzed to produce colloidal hydrated ferric oxides. After some …

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