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A new type bioretention facility that called as bioretention parterre was proposed to treat the stormwater of the siphonic drainage system in the Changzhen Depot of Shenzhen Metro. The connection point of the siphonic downspout and the inlet of bioretention parterre was calculated by corresponding calculation formula. The energy dissipation well and the outlet well are set at two sides of the bioretention parterre respectively. The outflow control device is set up in the outlet well to regulate the discharge. The innovative bioretention parterre provides new thought for sponge city construction of urban rail transit.

The sponge city facilities in Changzhen Depot of the Shenzhen Metro Line 6 were laid out in consideration of the depot characteristics, geological and hydrological conditions of the project site, construction period and national and local sponge city construction requirements. Some innovative sponge facilities such as ecoroof, biological wastewater treatment system, bioretention parterre, multipurpose detention pond, Bioretention belt and environment-friendly gully were designed to treat the stormwater of Changzhen Depot and part of the reclaimed water of the Changzhen wastewater treatment plant. The scales and capacities of the sponge city facilities were determined by volumetric method. The demonstration project of sponge city in Changzhen Depot is the first low impact development urban rail transit project in the world. The sponge city design philosophy in Changzhen Depot is beneficial to the construction of green urban rail transit in Shenzhen, even in the whole of China.

Large volumes of construction waste have been produced with the rapid development of subway projects in Shenzhen, China. To solve the problems of difficult storage and low resource utilization of the subway construction waste, Shenzhen government has required the contractors to reduce the subway construction waste by onsite and offsite treatment processes since May 2019. This study introduces an offsite treatment process of the subway construction waste in Shenzhen. Some improvement measures such as replacing drum-type sand screening and settling tanks with centrifugal solid-liquid separation equipment and inclined plate sedimentation equipment are proposed to recycle fine sand and heighten treatment efficiency.