Mr NG Yue-yan, Joe (right), Building Surveyor of the BD, told us about the components of a drainage system, and the knowledge required for inspection and maintenance of drainage pipes in the seminar, and answered the audience’s questions in real time. On the left is Mr TANG Kwok-kuen, Senior Professional Officer of the BD.

Mr NG Yue-yan, Joe (right), Building Surveyor of the BD, told us about the components of a drainage system, and the knowledge required for inspection and maintenance of drainage pipes in the seminar, and answered the audience’s questions in real time. On the left is Mr TANG Kwok-kuen, Senior Professional Officer of the BD.

Mr NG Yue-yan, Joe (right), Building Surveyor of the BD, told us about the components of a drainage system, and the knowledge required for inspection and maintenance of drainage pipes in the seminar, and answered the audience’s questions in real time. On the left is Mr TANG Kwok-kuen, Senior Professional Officer of the BD.