Spillway
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A spillway is a structure used to provide the controlled release of water from a dam or levee, typically downstream into the dammed river. In the United Kingdom, it may be known as an overflow channel
Chute spillway of Llyn Brianne dam in Wales
A stepped-chute baffled spillway of the Yeoman Hey Reservoir in the Peak District in England
Vegetation has grown in the bell-mouth spillway at Covão dos Conchos, Portugal, since its construction in 1955 such that it resembles a natural formation
Glory hole spillway in Lake Berryessa, California, in March 2017
Reservoir
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A reservoir is an enlarged lake behind a dam, usually built to store fresh water, often doubling for hydroelectric power generation.
Kardzali Reservoir in Bulgaria is a reservoir in the Rhodope Mountains.
Some reservoirs such as this in Argos, Peloponnese are made for recreational purposes, rather than storing fresh water.
Lake Vyrnwy Reservoir. The dam spans the Vyrnwy Valley and was the first large stone dam built in the United Kingdom.
The East Branch Reservoir, part of the New York City water supply system, is formed by impounding the eastern tributary of the Croton River.