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A dam is a wall of solid material built across a river. As a result water is stored in a lake that will form upstream of dam. The main purpose of the most of the dams is to create a reservoir of water to use at a later time. There are different types of dams like concrete dams, arch dams and earth dams. The design and construction of a dam depends upon its purpose and location as well as materials and workforce available.

A dam must be waterlight, and must be also stable. The dam wall must have sufficient strength to firstly bear its own weight and secondly to resist the water pressure in the lake upstream of the dam. It must have an outlet valve to release water in controlled amounts as required. It also needs a spillway so that large volumes of flood water can flow around it without causing any damage to the structure itself.

Dams are extremely useful to us for they help to control floods and supply water to dams and cities. Dams also generate hydroelectric power, and the water stored in the lake is useful for irrigation of crops. The lake that forms behind the dam can be useful for water sports and leisure activities. Often, large dams become tourist attractions of their own sight.
Dams are helpful for us because the direct where the water flows to other places that don't have water

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