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The outdoor drainage holes are often blocked due to the accumulation of leaves and debris during heavy rain season. When water exceeds doorsill on the balcony, it will flow into indoors. Therefore, this invention attempts to improve this phenomenon. When water flows into the drainage holes, it will drive the rotating blades to rotate, causing the central shaft and the rotating elements to rotate. These push units will push outward or pull inward by using the effects of changes in the periphery concave-convex shape of the rotational unit, spring and water flow. The blocks will be pushed away.
Jyun-Jie Liao(student), Wen-Kuei Wu(student), Li-Ming Chu (advisor)