The sewerage system project includes wastewater collection pipelines and pumping stations. The wastewater collection pipelines comprise trunk sewers B, C and their branch sewers with diameters from 300mm to 1350mm. The total length is about 29,800m. Sewers with diameters of 800mm and above are constructed using pipe jacking, while those with diameters less than 800mm are constructed using micro  tunneling. There are two pumping stations, each one of them is equipped with four submersible pumps.