Gate, catch basin and catch basin control method

The invention discloses a gate, a catch basin and a catch basin control method.The gate comprises a rotating part, at least one pair of blades and a brake part, and the rotating part is suitable for being rotationally connected with the inner wall of a pipeline; any one blade is connected with a rotating piece located in the pipeline; the brake part is suitable for being connected with the inner wall of the pipeline and used for generating damping torque to the rotating part; when the rotating torque generated when fluid in the pipeline impacts the blades is larger than the damping torque, the pair of blades are driven by the fluid in the pipeline to rotate so as to drive the rotating part to rotate in an overflowing state. And when the damping torque is greater than a first threshold value, the pair of blades has a cutoff state of limiting the rotating piece through the damping torque and blocking the pipeline. The gate can be opened and closed only by adjusting the damping torque without lifting the whole g