Risk concerning rehabilitation of closed sewers wth internal diameter bigger than 1 m
In the last few years there have been executed some substantial rehabilitation project that concerned sewers with diameters bigger then 1 m. Those kind of sewers are used not only for drainage, but also for the retention. That is why most valuable rehabilitation solutions in this case are those methods which do not result in a pipe diameter reduction – and that would be the CIPP or construction chemicals usage. Both of the solutions are risky and demand thoroughness.

prof. dr hab. inż. Cezary Madryas, Wroclaw University of Technology
Wrocław University of Science and Technology rector. The majority of studies conducted by Prof. Madryas focus on development in its broadest sense,
modernization and the recovery of underground infrastructure of urban areas. Studies related to this field of engineering have been conducted by Prof. Madryas in many Polish cities: GdaÅ„sk, Katowice, Kraków, PoznaÅ„, Szczecin, Torun, Warszawa, and WrocÅ‚aw. Professor Madryas is the author or co-author of eight books, including four monographs and four academic publications. He is also the author or co-author of 170 published scientific works and 290 reports on research carried out for the National Economy (SPR reports).