Which of the following statements about dams is incorrect?

A dam is a barrier across flowing water that obstructs, directs or retards the flow, often creating a reservoir, lake or impoundment.

Dam refers to the huge concrete structure that creates the reservoir.

Dams have a section called a spillway or weir over which water flows either intermittently or continuously.

Dams are built for irrigation, electricity generation, water supply for domestic and industrial uses, flood control, recreation, inland navigation and fish breeding.

Dams help us in conserving and managing our water resources.