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Planning Phase | Rehabilitation Projects | Back to System Improvements

The Modified Consent Decree requires the S&WB to identify the structural needs of the sewer collection system. The structural needs of the system are identified through the use of Collection System Evaluation Studies (CSESs).

Collection System Evaluation Studies (CSESs) were performed in each of the ten service basins of the sewerage collection system. These studies utilized field investigation methods consisting of Facility Surveys and Manhole Inspections, Flow Isolation, Flow Monitoring and Rain Gauge Measurements, Smoke Testing, Dye Testing and Closed Circuit TV (CCTV) inspection to identify system defects.

Facility survey provides surveyed locations and elevation for the sewer manholes. Manhole Inspection determines the physical condition and identifies defects for repair of the sewer manhole.


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on Flow Monitoring

Flow Isolation isolates small reaches of sewer pipe and measures the infiltration rate of groundwater into the sewerage system.

Flow Monitoring determines sewage flow in dry weather and wet weather. The rain gauge measures the amount of rainfall to coincide with the wet weather flow.



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on Smoke Testing
Smoke testing introduces a non toxic smoke into sanitary sewers to find defects in the sewer system.

Dye testing identifies inflow due to rain into the sewer. Florescent dyed water is injected into the drain adjacent to the sewer line. The sewer line is inspected for presence of dyed water.


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on Dye Testing

CCTV inspection of sewer line segments is used to identify structural defects for repair. A closed circuit television camera travels along the sewer pipe to “see”/record the actual condition of the pipe.





The purpose of the CSES Study is to evaluate the following aspects of the sanitary sewer system:

  • Structural condition of the sewer system
  • Sources of Rainfall Dependent Infiltration and Inflow (RDI/I) in the sewer system
  • Sources of Groundwater Infiltration (GWI) in the sewer system
  • Estimate of Rehabilitation costs for the sewer system

The CSES produces recommendations for rehabilitating the identified structural deficiencies. Analysis of the CSES study produces a Remedial Measures Action Plan (RMAP), which identifies repair locations and the associated rehabilitation method and schedule.

The CSES studies have been completed in all ten rehabilitation basins, including Algiers Basin. However, the Modified Consent Decree is applicable to the east bank of the sewer collection system only.



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