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The protection of urban channels becomes increasingly necessary when the levels of degradation of water resources tend to increase worldwide. This article deals with an evaluation of the water quality of the main channels (São Joaquim channel, Pirajá channel, Antônio Baena channel and Una channel) that depart from the Una hydrographic basin in the municipality of Belém, Pará State-Brazil. For the evaluation, three measurement campaigns were carried out at four points determined in the channels of the Una hydrographic basin, in the period considered mostly rainy, from April to June 2012, with the following physical-chemical parameters being surveyed: dissolved oxygen, water temperature, biochemical oxygen demand, Nitrate, pH, turbidity, Total Phosphate and fecal Coliform, for the determination of the Water Quality Index (WQI) of the channels, in addition to determining the flow of the basin using the ADCP (Acoustic Doppler Current Profiler). In general, the WQI of the main channels had a regular result, only the Antônio Baena Channel had a bad WQI. The work contributes to the management and planning of water resources in the region.

RESUMO Estuda-se o comportamento hidráulico do sistema de drenagem da Bacia do Paracuri, no município de Belém (PA), com o uso do código computacional livre Storm Water Management Model (SWMM), sendo simulados dois cenários, ambos referentes à ocorrência de uma chuva de 82 mm de precipitação e duração de 6 horas. O primeiro cenário consiste no canal projetado, em perfeitas condições, e nesse caso não ocorrem alagamentos. O segundo cenário simula o mesmo canal com assoreamento de 50 cm, e ocorre inundação. Assim, verifica-se a utilidade do SWMM para simular o comportamento hidráulico dos sistemas de drenagem com dados de precipitações reais, diferentes das chuvas de projeto.

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