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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.
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The initial text of this section was an abridgement from Smith's
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excelled in the construction of emissaries, as in all their hydraulic works, and remains are extant showing that lakes
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Walter
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or variable-depth body of water. It typically leads to a lower stream or river, or to a location where a
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in Sicily: they were admired for their sheer size, although the workmanship was crude.
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can be economically run. Drainage tunnels have frequently been constructed to drain
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The most remarkable emissaries carry off the waters of lakes surrounded by hills.
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is said to have first conceived the idea of this stupendous undertaking
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inaugurated what was to have been a complete drainage scheme, the
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42nd
Congress of the International Association of Hydrogeologists
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were all drained by means of emissaries. The case of
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119:Trasimeno
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177:See also
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