Drainage tunnel

It typically leads to a lower stream or river, or to a location where a pumping station can be economically run.

In 480 BC, Phaeax built drains at Agrigentum in Sicily: they were admired for their sheer size, although the workmanship was crude.

The case of Lake Fucino is remarkable in two ways: the attempt to drain it was one of the rare failures of Roman engineering, and the emissary is now completely above ground and open to inspection.

Julius Caesar is said to have first conceived the idea of this stupendous undertaking (Suet. Jul. 44).

The initial text of this section was an abridgement from Smith's Dictionary of Greek and Roman Antiquities (1875 edition, public domain).