Overflow

(1) The excess water that flows over the ordinary limits of a sewer, manhole, or containment structure. (2) An outlet, pipe, or receptacle for the excess water.

Owner

A public body of authority, corporation as partnership, or individual for whom the work in to be performed.

Oxidation

Loss of electrons, as when a metal goes from the metallic state to the corroded state.

Packer

See Compression RingA ring fitted between the end-bearing area of the leading pipe bell and the trailing pipe spigot to help distribute jacking forces more uniformly. A compression ring is attached to the trailing end of each pipe and is compressed between the pipe sections during jacking. The compression ring compensates for steering corrections, pipe misalignment, and pipe dimensional tolerances. Also referred....

Parapet

WallAlso riser. The vertical section between the bench and the cone of a manhole. or rampart, breast high. Also, the wall on top of an abutment extending from the bridge seat to the underside of the bridge floor and designed to hold the backfill.