In this work, it is proposed the use of a river lock as a non-formal setting for teaching hydrodynamical concepts. In particular, we describe the operation of a river lock situated in the Sobradinho's dam, at the São Francisco River (Brazil). A model to represent and to analyse the dynamics of a river lock operation is presented and we derive the dynamical equations for the rising of the water column as an example to understand the Euler's equation. Furthermore, with this activity, we enable an integration between the content initially introduced in the classroom with practical applications, allowing the association of physical themes to contents relevant in other disciplines such as History and Geography. Besides this, experiences of this kind enable teachers to talk about the environmental and social impacts caused from the construction of a dam and, consequently, crossover of concepts have been possible, making learning more meaningful for the students.
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