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Pubblic words, GARDENS AND PARKS, The design of a bridge depends on its…
Pubblic words
Dams
Types of dams
Used at beginning of the Industrial Revolution, theu can be built quicky but have a limited lifetime and height and need constant maintenance
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They are classified according to their size:large dams over 15 metres high major dams over 150 metres.
Gravity dams
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A dams is built: to create reservoir, to create a man-made lake -To stone water -To harness water power -To create electricity to prevent flooding for aesthetic or recreational purposes.
Before building a dam, future environmental impact, should be estimated and some foundamental concerns should be considered.
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BRIDGES
A bridges is built to allow roads, paths, railways overhead power lines and gas to pass over physical obstacies such as valleys rivers and roads.
The first bridges were probably fallen tree trunks. The first great bridge builders were the Ancient Romas.
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The design of a bridge depends on its purpose, the kind of ground it is built on and the material used to build it.
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They are barriers, usally built across a riveror a stream, to control and retain is water.