Aqueducts

structure constructed to convey water

150px|right|thumb|A ditch in the Netherlands thumb|right|150px|Ditches at the Ouse Washes [[nature reserve.]] thumb|150px|Waterplants growing in a ditch in the Netherlands, showing Sagittaria sagittifolia to the right. thumb|Major ditch of Sueca, Valencia|Sueca, [[Valencian Community]] A ditch is a small-to-moderate size trench created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches are commonly seen around farmland, especially in areas that have r

thumb|The norias of Hama on the [[Orontes River in Syria (video).]]

type of flume used to float logs down to a sawmill

thumb|Penstocks at the Ōhakuri Dam, New Zealand A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydro turbines and sewerage systems. The term is of Scots origin, and was inherited from the earlier technology of mill ponds and watermills, with penstocks diverting pond waters to drive the mills.

thumb|Jerwan Aqueducts Jerwan is a locality north of Mosul in the Nineveh Province of Iraq. The site is clear of vegetation and is sparsely settled.

thumb|Log flume in Sweden, August 2010

bridge for transporting water