Dye Water Testing and Limited Sanitary Sewer Evaluation Surveys (LSSES)- City of Wauwatosa, Wisconsin
R.A. Smith National has performed multiple Sanitary Sewer Evaluation Study (SSES) tasks for the city of Wauwatosa over the past four years. In general, the city has multiple areas with increased levels of inflow and infiltration (I/I) that have led to both public and private property issues during heavy rain events.
Under direction from the Milwaukee Metropolitan Sewerage District (MMSD) and its own desire, the city continues its proactive approach to identifying the sources of I/I into their system in an effort to reduce the flows in their sanitary sewers during storm events.
In 2008 R.A. Smith National completed an SSES project within the Honey Creek area which included: sanitary sewer smoke testing, closed circuit television (CCTV) inspection and flow monitoring. The result was a report that identified issues that needed to be addressed, with recommendation for public sewer repairs. The report also suggested that further testing be performed, as private property defects appeared to be the primary source of excess I/I in this area.In 2010, as a follow up to the above study, R.A. Smith National performed dye water flooding (testing) of the sanitary sewers in the above area, which resulted in the identification of significant private property defects that were contributing to the high levels of I/I that were experienced in this basin. The results of this initial dye water flooding effort have resulted in R.A. Smith National dye water testing more than 150,000 lineal feet of sanitary sewer in the city to verify the condition of the public and private property sanitary sewers. Each dye water study was performed with the use of a local CCTV sub-consultant, and resulted in rehabilitation recommendations that are planned for future implementation by the city.