Self-Cleansing
A consequence of good hydraulic design when the pipe invert is kept relatively free of sediments by ensuring adequate flow velocities.
Separate System
A system that uses sanitary sewers to convey the wastewater and stormwater sewers to carry the stormwater.
Serviceability of the Piping System
Continued service life with a high degree of confidence that a failure will not occur during its long-term service.
Settlement
Measurable downward movement of the ground or of an overlying utility or other structure as the result of excavation or dewatering.
Settlement Point or Marker
An instrument installed at ground surface or driven into the ground to monitor vertical ground deformations before, during, and after construction.