dropshaft

Etymology

Definitions

1. 1

   A vertical shaft which objects can drop through.

   • Melas said that district engineers had located Deep Tunnel dropshafts that were near a portion of the freight tunnels and that they would drill, cut or blast through to the flooded areas "as soon as possible."
   • The water flows from a large suitably fed tank into the dropshaft through a sharp-edged orifice, whose diameter (Do) is 100mm large.
   • The downpour led to some dramatic images of stranded motorists and geysers bursting through manhole covers. The spouts are a rare effect which occurs when too much water rushes into a dropshaft and traps air that’s normally vented.

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