How does a dam hold water?

Question: How does a dam hold water?

Answer: Dams are able to hold water by utilizing the force of gravity or using specific designs that provide structural strength. These two elements are combined in gravity arch dams. The more important aspect is gravity with structural designs like arches simply allowing for less material to be used. Most often concrete is used due to its ability to be poured into molds and being very dense. Concrete provides an abundant and simple building material to create the desired shape for structural strength while also being massive enough to maximize gravitational force. If the mass of a dam isn’t enough for the gravitational pull to overcome the force of water behind it the structure can be pushed or even topple over causing a disaster down river.

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