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Dimensionless equations for determination of peak flows for different return times in semiarid regions

ABSTRACT

In the design of hydraulic works, such as dams, studies referring to the peak flow rates are required for safe dimensioning. The state of Ceará is characterized by having a high number of reservoirs designed by ancient empirical equations. However, due to the limited data available in some regions, it is necessary to transpose information from monitored regions to unmonitored ones. This work elaborated regionalization models to obtain peak flows for return periods of 1,000 and 10,000 years in dams located in Ceará. The variables used in the equations were: drainage area of the basin, length of the main river, concentration time, rainfall lasting 1 hour, and the difference in elevation between the basin and the most remote point of the basin. Project data from 30 dams were used and the peak flows were calculated using the HEC-HMS software. The statistical tests and the values of the determination coefficients (0.95) allow to consider the proposed dimensionless equations consistent and capable of being used in preliminary analyzes of hydraulic projects.

Keywords:
regionalization; peak flow; semiarid; dimensionless formulation

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