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Based on experimental studies and analysis of the representation of shape effect of the channel in uniform flow calculation, Kazemipour and Apelt (1980) developed a procedure named Kazemipour’s method. By adapting the friction factor, this method makes it easier to calculate uniform flow in smooth circular channels using equations for pressurised tubes. Later, Goldfarb and Silva (2003), through a numerical procedure, modified this method which originally depended on graphic procedures and made it independent of graphic tools. This method named Goldfarb and Silva, was compared by these authors to the use of Manning’s equation to calculate flow in smooth circular channels and proved more efficient. In this work the shape parameter of open flow in circular tubes is evaluated, seeking to facilitate the application of the new method. The analytical validation of Kazemipour’ method is also presented. The simplified implicit method obtained is compared again to Manning’s equation. The results were better than those obtained by using Manning’s equation. The possibility of unifying the procedures to calculate the friction factor in the pressurized phase and in open circular channels is also proposed. Key-words: friction factor; smooth circular channels; smooth pipes.

Formulação Unificada para Cálculo da Resistência ao Escoamento em Canais e em Tubos Pressurizados Lisos