Hydraulic structures

thumb|upright=1.75|The Edersee Dam in [[Hesse, Germany]] A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect or store water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodga

thumb|280px|upright|Chute spillway of Llyn Brianne dam in [[Wales]]

thumb|right|Scheme of a cesspit that is constructed like an underground holding tank

sub-surface drainage system

underground structure that disposes of unwanted water, most commonly storm water runoff, by dissipating it into the groundwater

ditch to drain wet lands

reservoir on upstream of the Saigon River

form of engineered sump or percolation pond

vertical tubular structure for capturing water from reservoirs