• A half round channel cast in the concrete in the bottom of a manhole to direct discharge when the flow is low.
  • Concrete placed in horizontal steps on steeply sloping fill to prevent sliding.
  • Concrete laid on the side slopes of drainage channels where the slopes are interrupted by manholes, etc.
  • Concrete laid ina pipeline trench to provide firmer support.

Real Estate

  • noun the layer of concrete in a manhole between the channels and the brickwork