The sewer system is ancient and poorly designed, combining storm water runoff with sewage in the same piping system.

下水道系统是古代和设计不当，结合雨水径流污水在同一管道系统。

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Pipe corrosion come mainly from outside -pipe corrosion and corrosive medium transported inside the pipe. Serious inside -pipe corrosion exists in petroleum and sewage transportation piping.

管道腐蚀主要来自管外腐蚀及管内输送的腐蚀介质，输送石油及输送污水的管道内腐蚀更严重。

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Alternatively, many homes, as well as businesses and hotels, have their wastes carried by water and pressure through a piping system to a sewage treatment facility.

另外，许多家庭，以及企业和酒店业，有其废物进行，由水和压力，通过管道系统的一个污水处理设施。

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Unusually, it is local people who are responsible for maintaining the sewage piping in their neighbourhood.

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The neglected site may be situated next to a garbage dump or may be affected by bacteria from nearby sewage piping.

CNN: Team sees challenges of providing safe water