Sword Lake formerly had two doors, one drain directly poured waste water through the drain and into the Lake. However, due to the influence of pollution seriously too, so a drain pipes were obscures, left a sewer. domestic wastewater is planned not to waste into the Lake. every year, to the rainy season, the water in the tank rises, the manhole is left will be used to adjust the water level in the Lake. Avoid attenuated status, do affect the urban landscape.
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