Answer:
A dam is
a barrier across flowing water that obstructs, directs or retards the flow,
often creating a reservoir, lake or impoundment.
Dams are classified according
to their structure, intended purpose or height. On the basis of structure and
material used dams are classified as:
(i) Timber dams
(ii) Embankment dams or
masonry dams.
According to their height dams
can be categoried as:
(i) Large dams or major dams
(ii) Low dams
(iii) Medium height dams
(iv) High dams
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