In this work is present an approach to shallow-water animation on interactive applications based on a physic model. For the simulation, was employed a Lagrangian methos known as Smoothed Particle Hydrodynamics (SPH). Based on the work of muller et al. (Muller et al., 2003), which applied SPH in computer Graphics, and on the work of Rodriguez-Paz (Rodriguez-Paz; Bonet, 2005), wich proposes a variation of this method to shallow-water simulation on engineering applications, we have proposed a simple and efficient approach for shallow-water simulation on games under the influence of irregular terrains.