Urban drainage networks are designed according to a series of regulations and methodologies that seek for an adequate operation of the system while transporting the urban wastewater and runoff. The design methodologies are founded in empirical or physically based flow resistance equations, such as Manning's and Darcy-Weisbach's equation, respectively. This work presents a statistical analysis over the costs obtained using the mentioned equations, considering different scenarios and materials.

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... os and materials. Furthermore, a comparison of the total construction costs was made to determine which methodology is the most appropriate for an urban drainage optimal design. The numerical examples were performed over two urban drainage networks with different topographical characteristics.