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  Arch
dams are made from concrete.
They are curved in the shape of an arch, with the top of the
arch pointing back into the water. An arch is a strong shape
for resisting the pushing force of the water behind the dam.
Arch dams are usually constructed in narrow, steep sided valleys.
They need good rock for their foundations,
and for the sides of the valleys, to resist the forces on
the dam.
There are only a few arch dams in the UK, including Monar
Dam in Scotland.
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