Televising sanitary sewers allows Engineering and Public Works staff to see "inside" of the sanitary sewer. The camera measures the exact distance in a pipe, so repairs to cracks, joints, or removing obstructions can be done easily and precisely.
The condition of the pipe is recorded as the camera moves through the pipe. The pipe condition and its location are then used to establish a pipe priority grade. A sanitary sewer priority grading system offers the City a proactive approach to eliminating sanitary sewer overflows (SSOs). The system allows City staff to pinpoint areas within the gravity sanitary sewer pipes that need a more thorough investigation due to the critical nature of the location, physical attributes of a pipe section, the structural integrity of the pipe, and operation and maintenance needs of the pipe.
The general formulas in the priority grading system are listed below:
Priority Grade = Criticality Grade & Condition Grade
Criticality Grade = Probability of Failure & Consequence of Failure
Condition Grade = Structural Grade & Operations and Maintenance Grade
Establishing priority grades ensures that the City’s resources are being used to maintain and/or rehabilitate the more critical areas within the system first and allow time to develop a schedule to investigate the less critical areas at a later date.