Recently, the Guiyang Municipal Natural Resources and Planning Bureau issued a pre-approval public notice for the administrative approval of the Guizhou Sanjiang Project supporting drainage project. The project is located in Wudang District, Guiyang City. The applicant is Guiyang Investment Holding Group Co., Ltd. The planned drainage box culvert has a total length of 2,673 meters, and the sewage pipe has a total length of 2,650 meters.

It is reported that the box culvert under Hucheng West Road is arranged under the roadway of Hucheng West Road; the box culvert under the internal road of the prison area is arranged under the road centerline; the box culvert under Hucheng East Road is arranged under the roadway of Hucheng East Road. The dimensions of the drainage box culverts are 3m×3m, 5m×3m, and 5m×4m respectively. The entire drainage box culvert discharges from the Hucheng West Road side to Hucheng East Road, and the box culvert finally discharges into the Sanjiang River.

At the same time, interception pipes are laid synchronously along the section from Hucheng West Road to the internal road of the prison area. The interception pipes discharge to the sewage pipe of Hucheng East Road and finally to the Sanjiang Sewage Treatment Plant. Section from Sanjiang Avenue to Hucheng East Road: the box culvert under the internal road of the prison area is arranged under the road centerline, and the drainage box culvert dimension is 3m×3m. The box culvert in this section discharges from the Sanjiang Avenue side to Hucheng East Road and finally into the synchronously designed drainage box culvert of Hucheng East Road. Planned Hengsan Road section: the sewage pipe in this section is arranged under the roadway of Planned Hengsan Road, with a pipe diameter of DN800, and finally discharges from the Hucheng East Road side to the Planned Sanjiang Sewage Treatment Plant. The drainage system of the entire section follows the drainage principle of separate rainwater and sewage systems.