Calibration of mathematical water quality modeling in a river basin under critical conditions.

In order to assist with the management of water resources, this study aimed to calibrate the water quality model "Ottocoded Critical Basins Analysis" (ABaCO) in a section of the Lambari River, located in the city of Poços de Caldas, Minas Gerais, Brazil, and it is considered qualitatively critical by the "National Water Agency" (ANA). The calibration results, obtained automatically by the Microsoft Excel tool Solver, showed good adjustments between the simulated and observed concentrations for the following parameters: total nitrogen, organic phosphorus, inorganic phosphorus, and total phosphorus, considering a visual interpretation of the graphics. The other calibrated parameters (BOD, DO, organic nitrogen, ammoniacal nitrogen, and nitrate) obtained satisfactory adjustments.