The combined sewer system within the City of Hartford is complex. It contains multiple siphons, regulators, and outfalls to the Connecticut River and its tributaries. The Metropolitan District Commission (the District) operates and maintains over 16 pump stations and 2,244,239 linear feet of sewers in the city. About 34 percent of sewers are over 75 years old and 55 percent of the large diameter sewers are brick sewers.To enhance the effectiveness of the District’s Capacity, Management, Operations, and Maintenance (CMOM) program, the District used various sewer inspection technologies to determine the condition of large diameter sewers within the City of Hartford. This approach included comprehensive inspection of sediment levels and structural deficiencies under various flow conditions. This program included manhole inspections and use of CCTV, laser, and sonar methods. The objective was to identify areas where sediment buildup and/or defective pipelines may contribute to combined sewer overflows (CSOs) and cause other operational issues. Additionally, the project sought to facilitate assessment of problem pipelines and to prepare and implement a follow-up program that prioritizes near-term and long-term recommendations for future sewer cleaning and sewer and manhole repair/rehabilitation.
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