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According to research, the main reason to result in flood is that human’s garbage obstructs the ditch. The bars of the ditch cover are shaped like a wave. When trash piles up on the ditch cover, the wave-shape bars prevent the garbage to block the ditch gate completely so that water can still flow down swiftly. Compared to ditch covers with small holes to prevent trash to fall which also make the hole easier to be blocked by accumulating trash, it still works when covered with garbage,