construction of stormwater pits, sanitary sewer system distribution chamber and pump station. construction the sewerage valve pit

building bunker catch basins chamber column concrete pouring construction site culverts digg digging ditch drain systems drainage system water formwork gate valve ground hole household installation manhole pipe pipeline pit plumbing pump station pumping rainwater reinforcement sewage sewer pipes sewerage storm sub terrain tank treatment trench underground walls meter vault waterproofing