Sewer System Evaluation Study

Smith Branch Basin - SB-01

Weston & Sampson provided technical engineering support to the City of Columbia for a Sewer System Evaluation Study (SSES) of a portion of the City’s sanitary sewer system (Smith Branch Basin – SB-01) to identify problems that may lead to sanitary sewer overflows (SSOs). The investigations identified structural, operations and maintenance, and infiltration and inflow (I/I) related problems.

The project involved approximately 800 manholes and 145,702 linear feet of sewer main less than 15-inches in diameter. The scope of services specifically includes the following SSES tasks:

  • Manhole inspection and survey
  • Sanitary sewer closed circuit television (CCTV) inspection
  • Zoom camera television pipe inspection
  • Gravity sewer system manhole inspections
  • Gravity sewer system smoke testing
  • Dye testing

This project also included the Design and Construction of the high priority rehabilitations, which included structural and maintenance-related defects as well as I/I sources, to reduce the likelihood of SSOs. Weston & Sampson performed investigation, design, bidding and general services support during construction.

Construction was completed in April 2020.


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