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  Spillways
are structures that either form part of a dam, or are found
just beside one. They are used, when a reservoir
is full, to pass floodwater safely, and in a controlled way,
over a dam, around it or through it.
Next time you visit a dam, look for its spillway. Here are
some of the different types you may see:
Spillways are not the only outlets
for reservoir water. Other outlets are built into the dam
or away from it to let water out for a number of uses. These
are some of the different types of outlets:
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