The guidelines of 1996 have to be adjusted to current technologies. Part of this actualization was to develop guidelines for an ecological construction of several parts of the sewage system. Especially infiltration supplies, ditches and provisions of combined sewer overflows can become part of the ecological infrastructure with some adjustments. Guidelines for such an ecological construction were made based on literature, foreign methods and advices from experts. Special attention was given to storm water runoff quality. One section of the guidelines deals with the best practices to prevent or to treat pollution of storm water runoff.