definition
strict definition
arch-gravity dam
A composite dam with the bowed shape of an arch dam and the heavy infill of a gravity dam.
An arch-gravity dam is a composite between an arch dam and a gravity dam. Like an arch dam it is bowed toward the upstream side to resist pressure from the water behind it, and like a gravity dam it uses a significant amount of infill to give it mass for stability and support.
The structure combines the curved geometry of an arch dam with the stabilizing mass associated with a gravity dam. Both characteristics contribute to its resistance to the water load.
It differs from a predominantly gravity dam in its arch action. It differs from a thinner arch dam in its greater reliance on material mass.
Related definitions
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arch dam
A dam curved toward the upstream side so that arch action helps resist the pressure of the water behind it. -
barrage
A dam consisting of a series of movable gates used to regulate water flow in a channel. -
embankment dam
A water barrier composed of loose material held together by an outer shell. -
gravity dam
A dam that relies primarily on its own substantial mass to resist pressure from the water behind it. -
weir
A barrier with water flowing over it, used to control the flow rather than block it.