Hydrodynamic modeling can be applied to any water body. Thus, modeling was used in one of the largest rivers in the world, the Amazon River! In addition to it, the Tapajós River, the Xingu, and the Tocantins were also included in the model developed by Borba & Rollnic (2016). This set of rivers was called the Pará-Amazonas River System, located in the Pará state.
Hydrodynamic modeling can be realized through several programs, such as MIKE, SisBaHiA, Delft 3D, among others. In developing the Pará-Amazonas River System model, Delft3D was used. To be able to acquire the model data, the authors added five cross-sections (L1 to L5) to evaluate the fluvial discharge in this estuarine system.