Supplementary to Question No. 6 in the
Legislative Council on 3 April 1985
Mr. CHAN Ying-lun :- Sir, while I am satisfied with the reply by the
Secretary for Lands and Works, can he further explain the reasons for
the build up of solid matters on the inside of the pipes as mentioned
in paragraph 2 of the reply?
Secretary for Lands and Works :- It is normal over the years that
various matters such as grit and grease do get into the drainage
systems and solidify. The problem is exacerbated by construction
activities where people wash down the cement slurry into the drainage
system and the cement slurry solidifies inside the pipes.