The outflow - discharge of water exits in navigable canals, e.g. from industrial, power plants, and storm water collectors - affects the velocity distribution in these canals. As a consequence, navigation processes may be influenced when the lateral velocity exceeds a certain limit, beyond which the ship may have a complete lateral drift. This drift can reach two times the ship's width or even more. Moreover, this may cause a rotation in the vertical axis of ship. In the present study, numerical experiments were carried out using the RMA2 model to estimate velocity distributions at different distances from the outflow water exits. The results were presented by curves which are useful for estimating the velocity distribution for a given conditions. These curves are beneficial for estimating the distance from the outflow water exits required for safety navigation process. The results of the numerical model were verified by experimental results. Good agreement was observed between both results.