It consists of a transparent cylindrical vessel which can be rotated by a variable speed motor. In this vessel by using varies and a cylinder suitably, free and forced vortices can be formed. An upper probe can traversed horizontally and vertically across full diameter of the vessel, so that water surface profile can be measured in case of forced vortex. Both axes contain graduation so that exact position of the probe is known. The vessel will be mounted on suitable rotating platform with bottom drain arrangements for the vessel.