* Lifting is powerful for use of multi-hydraulic cylinder. * Installation space is law and transport is stable for use of multi-expansion and contraction beam.(Indoor installation is possible) * Automatic operation control and saves labor cost. * Cost-effective because one unit covers multi-stream channel.(Traveling carrier type) * Multi-operating selection is possible considering the water level, time control, and cleaning of a certain stream. * Maximize stability of the unit travelling to a stream channel with action of both rack and pinion gear type.