It solves exercises Hydraulics on currents to Free Surface. Many functions perform iterative calculations as for example for the characterization of the beds with the formula Chezy-Bazin, whereby in accordance with input data, can take a long time for the resolution. It includes the following functions: - Calculate height water runoff - Calculates flow rate of outflow - Scala runoff - Profile - Hydraulic jump (only in the full version) - Hydraulic jump with tank downstream (only in the full ver