sewer pipes for laying an external sewage system at a construction site. sanitary drainage system for a multi-story building. civi

building city civil communication concrete conduit connection construction culvert dig dirty ditch drainage earth engineering equipment excavation external ground hole industrial industry infrastructure installation laying lines main multistory network pipe pipes pit plumbing pumping repair replacement sanitary service sewage sewer sewerage sewersn site soil storm supply system trench tube underground urban water wells work