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reaches a reservoir or dam. The goal of this study was to estimate the organic loading (OL) and the nitrogen (NL) and phosphorus (PL) loadings in the mouth of the subbasin of Cascata brook and assess the water quality and its contribution to the eutrophication of Barra Bonita Reservoir (Tietê River, São Paulo-Brazil). Water samples and flow measurements (F) were collected every month (from May/2011 to June/2012) at the mouth of Cascata brook. It were analyzed: the pH and total organic carbon concentration (TOC); the total nitrogen (TN); the total phosphorus (TP); the dissolved oxygen (DO); the biochemical oxygen demand (BOD5,20); the electrical conductivity (EC); and the chloride (Cl). Microbiological analysis (thermotolerant coliforms (TC)) and descriptive statistics were performed. The influence of the precipitation index (PI) over the flow and over the parameters loads was analyzed. The average monthly V at the mouth of Cascata brook was 81,5 L.s; the OL was 1,35 g.s or 3,6 g.s in DO; the NL, 0,21 g.s and the PL 0,007 g.s . The EC was above the standards (100 μS.cm) in two samples, and the TC reached 1,1.x.10 MPN in one of the samples. The subbasins contribute to the eutrophication and maintaining them prevents the increase of nutrients in their waters. The Cascata brook has good water quality, and any waste releases are easily assimilated and can be controlled.

revista brasileira de geografia física

Water Quality, Organic Loading and Nutrient Loading in the Mouth of Cascata Brook: The Subbasin contribution to Barra Bonita Reservoir (Tietê River - São Paulo (Brazil)