definition
strict definition
arch dam
A dam curved toward the upstream side so that arch action helps resist the pressure of the water behind it.
An arch dam is a barrier in a flowing water channel which is bowed with the convex side facing upstream. The curved form allows it to be built with less material than a gravity dam or embankment dam.
The upstream curve transfers much of the water load toward the abutments through compression. The curved form therefore contributes directly to resistance against the water pressure.
A gravity dam relies primarily on its mass. An arch-gravity dam combines a curved form with substantial mass.
Related definitions
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arch-gravity dam
A composite dam with the bowed shape of an arch dam and the heavy infill of a gravity dam. -
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.