Movable Dam, Rubber Dam, Hydraulic Dam manufacturer / supplier in China, offering The Hydraulic Flap Gate Allows Sand, Stones and Dead Wood to Pass Through Naturally, Avoiding The Siltation Problem of Traditional Gates, The Hydraulic Cylinder Precisely Controls The Opening Degree of The Gate to Maintain The Ecological Base Flow of The Mountain River During The Dry Season, The Hydraulic Gate Achieves The Dual Goals of Water Resource Utilization and Ecological Protection and so on.