Wastewater Collection System

Asset Management and Maintenance Program

The Wastewater Collection System Asset Management and Maintenance Program consists of cleaning, mapping, and assessing the condition of sewer pipes and assets within the collection system.

Cleaning – A high pressure cleaning process is used to remove grit and deposits within pipes and manholes. Regular cleaning helps to ensure that system performance is optimized and serves to minimize Sanitary Sewer Overflows (SSO’s) and Combined Sewer Overflows (CSO’s). Regular cleaning and maintenance also serves to meet the requirements of the Environmental Protection Agency’s (EPA) Capacity, Management, Operations and Maintenance Program (CMOM).

Mapping – The mapping process consists of collecting GPS information on the pipes and manholes in the system and updating the Commission’s Geographic Information System (GIS) accordingly. Advances in the GIS allow for increased efficiency of operations, maintenance, and planning functions.

Inside a combined brick sewer pipe circa 1887

Inside a combined brick sewer pipe circa 1887

Assessing – Information on the condition of pipes and assets is gathered through Closed Circuit Television (CCTV) inspections using robotic cameras, visual inspections, High Definition Television (HDTV), Sonar, and Laser profiling. This information is used to develop a prioritized list of pipes and assets that are in need of improvements as well as to refine the Annual Capital Improvement Plan and Maintenance Plan for the upcoming years.

The Wastewater Collection System Asset Management and Maintenance Program started in September, 2009. From the start of the program to December, 2013, the Commission has cleaned and assessed over 1.4 million feet (264 miles) of pipe, which is approximately half of the sewer collection system. The Commission has also recorded over 6,800 survey grade GPS points on existing manholes and updated the GIS with this information. Approximately 300,000 feet of sewer pipe is cleaned, mapped, and assessed annually.