He is frequent to find in texts of Dynamics that the deviation of the channel of certain rivers in Siberian steppes must Coriolis in order that. But in a publication found in Internet it surprised to us that the author assured that by means of laboratory tests can demonstrate that the Coriolis effect does not have any effect on the erosions caused by these rivers and their consequent deviation of the channel. The test in mention was made constructing to an artificial channel with a mixture of clay and stones that turns the model into a structure with certain impermeability and nonown rigidity to observe effects of erosion caused by dilution. Therefore in this article we described a test of laboratory easy to carry out with which we can observe the erosive effects mainly due to the dilution and the forces caused by the Coriolis effect. Using sand for moulding of castings, model a channel that simulates the channel of the river and the effects caused by a water volume were observed on the geometry of the channel of rectangular cross-sectional section during a period of time of 5 minutes. The carried out observations took control without rotation and of rotation of the channel, which allows to soon visualize the effects of erosion without the Coriolis effect and him. We want to emphasize with this article the analytical importance whereupon the gratuitous information that is due to approach they provide the sites to us of Internet.