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Drainage holes are indispensable facilities for every building. As a standard configuration of ordinary
buildings, drainage holes are often clogged by foreign matters which leading to difficulties
in drainage. For outdoor drainage holes, most of the blockages are due to negligence in cleanup
or the accumulation of leaves and debris on the drainage hole covers during heavy rain or the typhoon
season. Therefore, how to effectively avoid drainage hole covers from being clogged, prevent
accumulated water on the rooftop, and keep drainage of buildings smooth are important issues this invention seeks to improve actively.
National Kaohsiung Normal University