Dam
A dam was a structure built to control the flow of water.
Ghum claimed that the Basks had violated the Co-existence Code by building a dam. (PROSE: The Oxaqua Incident)
The Eighth Doctor destroyed a fire elemental in Middletown by having some of the townspeople blow up the local dam. The resulting flood cooled and killed the elemental. (PROSE: The Burning)
In 1969, Rory Williams was caught and shot by Canton Delaware at Glen Canyon Dam. (TV: Day of the Moon)
In the late 20th or early 21st century, a military training site was built next to a dam in Caithness, Scotland. It was abandoned at some point before the dam was destroyed and thus flooded the area. In 2119, an underwater mining facility known as the Drum, stood in its place. The Twelfth Doctor and Clara Oswald visited the base and investigated a ghost invasion, caused by strange markings on the inside of an alien spaceship recovered from the water outside. (TV: Under the Lake)