Trench
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A trench is a type of excavation or depression in the ground that is generally deeper than it is wide, and narrow compared with its length.
A gas main being laid in a trench
Automated trench digging on a street in Baku
Allied troops entrenched in the Battle of Tuyutí during the Paraguayan War, 1866
The Boer trench at the Battle of Magersfontein contributed to the surprise defeat of the Highland Brigade on 11 December 1899 during the Second Boer War.
Swale (landform)
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A swale is a shady spot, or a sunken or marshy place. In US usage in particular, it is a shallow channel with gently sloping sides. Such a swale may be either natural or human-made. Artificial swales
Trench
…A trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a swale or a bar ditch), and narrow compared with its length (as opposed to a simple hole or pit). In geology, trenches result from erosion by rivers or by…
A constructed swale or bioswale built in a residential area to manage stormwater runoff
A natural swale