Condition Assessment of Aging, Hard to Access Sewer Mains

摘要

Of the 1,300 miles of sanitary sewer lines owned and operated by the City of Baltimore, approximately 16 miles is 6-inch diameter, which is not included in the 2002 Consent Decree. While these pipes represent a small portion of the collection system, they generate a disproportionate number of service disruptions because they were constructed in the early 1900s using vitrified clay pipe and substandard construction methods by today's requirements. Faced with the question of how to deal with these problematic small sewer lines, Baltimore City decided to perform a comprehensive condition assessment, followed by the renewal of the assets depending on the results of the assessments. The 16 miles of 6-inch sewers was prioritized for condition assessment based on history of complaints and pending street rehabilitation projects. The intent of this project is to improve the level of service these assets can provide, thereby minimizing service disruptions and potential public health impacts associated with SSOs and basement back-ups.