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tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening … Universalium
Daniel-Johnson Dam — For other uses, see Daniel Johnson. Daniel Johnson Dam Barrage Daniel Johnson … Wikipedia
Zanja Madre — The Zanja Madre ( Mother Ditch ) is the original aqueduct that brought water to the Pueblo de Los Angeles from the Porciuncula River. It is referred to as an open, earthen ditch which was completed by community laborers within a month of founding … Wikipedia
Maraetai Power Station — Maraetai Power Station … Wikipedia

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