Since odors often travel through pipe shafts, ventilation ducts, electrical outlets and holes or cracks in the walls, remediation typically begins with sealing up dwellings "especially in older buildings without central air-conditioning," Mr. Saft said.
In this study, an Open channel-Underground perforated pipe-Shaft system which included three identical subsystems was designed on the basis of local ditches, and applied at the Yellow River flood plain, Linqing city in North China.
Three anti-clogging methods of the filter tank, inclined underground perforated pipe and shaft were adopted to lower the amount of fine suspended particles in source water.
Most of the subsurface features consisted of different pipes, cables, shafts, sharp interfaces between the filling and the original soil, sewage and flooding sewers.
The early Inuit, or Eskimo, of northern North America lacked most useful metals, and so they fashioned the ivory from walrus tusks and buried mammoth tusks into a variety of utilitarian objects, such as bucket handles, bow drills, pipes, harpoon shafts, and needle cases.
Last winter, workers installed a crane on the roof of the building and dropped 70-foot-long pieces of 24-inch-diameter steel pipe down the shaft, where it was welded into a single unit.
Huge concrete‐mixing trucks dump concrete down a pipe in the shaft hole into a lurching, raucous concrete pumper that sends the mixture hurtling through another pipe under high pressure to the work site in the tunnel 100 yards or more away.
For measuring the drainage pipe outflow at "Shaft", the outflow was directed through a V-notch weir.
Water at "Outlet" was a mixture of drainage pipe water from "Shaft", road runoff and the much larger area of drained pastures uphill.
