An intake tower or outlet tower is a vertical tubular structure with one or more openings used for capturing water from

reservoir A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including contro ...

s and conveying it further to a hydroelectric or water-treatment plant. Unlike

spillways A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure th ...

, intake towers are intended for the reservoir's regular operation, conveying clean, debris-free water for further use.

Construction

An intake tower is typically made from reinforced concrete, with foundations laid in the river or lake bed. It has at least one water-collecting opening at the top, and may have additional openings along its height, depending on the purpose: towers for hydroelectric plants typically have only one inlet, while those in water-processing plants have multiple draw-off inlets. Near the bottom of the tower, depending on the dam construction and plant location, a horizontal or slanted outlet conduit takes the water from the tower into the plant. The most convenient location for an intake tower is in the proximity of the processing plant. In artificial lakes, those are typically placed near the dam. Lake bed near the dam also provides sufficient water depth to ensure substantial supply to the towers throughout the year, thus the exposed towers can be regularly seen along the dams. When built near the shore, an intake tower is equipped with a service bridge, used to gain access for maintenance.

Draw-off tower

Draw-off towers are intake towers specialized for drinking water reservoirs. They have multiple openings at various depths, typically equipped with valves, allowing drawing water only from the level where it is of highest quality.

Construction

Draw-off tower

References

See also