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A dam is a big wall to stop water getting through to certain places. It is also used to irrigate water, and some dams, to make hydroelectricity. Hydroelectricity is electricity that comes from water. It is a environment friendly way of getting energy or power. Dams are, of coarse, found mostly on rivers though always on water of some kind. Some are huge and some are smaller.
What is the difference between a dam, a weir and a barrage? A weir is an impervious barrier constructed across a river to raise the water level on the upstream side. The water is raised up to the required height and the water then flows over the weir. In a weir the water overflows the weir, but in a dam the water overflows through a special place called a spillway. Weirs have traditionally been used to create mill ponds.