Menezes Filho, Frederico Carlos Martins de, and Rafael Alan de Sá. 2019. “Comparative Study Between Empirical Equations and the Velocity Method for Estimating Time of Concentration”. REEC - Revista Eletrônica de Engenharia Civil 15 (1): 221-44. https://doi.org/10.5216/reec.v15i1.56559.