by National Geographic Society .
Written in English
National Geographic windows on literacy
|The Physical Object|
|Number of Pages||24|
Alan Witschonke is the illustrator of four Wonders of the World books: The Brooklyn Bridge, Empire State Building, The Great Wall and Hoover Dam/5(12). People started building dams a very long time ago. The ancient Egyptians built simple dams of earth and stones to store water from the Nile River well over years ago! Dams were also built in ancient times in Mesopotamia (now Iraq), Italy, and India. Abstract. Dam construction goes back in human history for more than years (e.g., Sadd el-Kafara dam in Egypt for flood protection), but most of the world’s existing dams have been built after the Second World War as consequence or basis of economic by: 7. ii Dams and Development: A New Framework for Decision-Making As one who authorised the next stage of one of the largest dams in the Southern Hemi-sphere I can argue that nations build large dams for sound reasons. Dams store, use and divert water for consumption, irrigation, cooling, transportation, construction, mills, power and recreation.
Damming has been an important engineering practice for thousands of years, with the first dam being constructed by Ancient Egyptians around B.C. Dams are built to block the flow of water, creating a reservoir behind the dam that can be used for flood control, as well as irrigation, municipal water supply, and other human activities. people and the conservation and protection of the natural resources of the State. (See Reference 1 and 2). Water stored behind a dam represents potential energy which can create a hazard to life and property located downstream of the dam. At all times the risks associated with the storage of water Guidelines for Design of Dams. Built for the People. We’re honoring 32 of the dams TVA built as a direct result of the Unified Development of the Tennessee River System plan—bringing flood control, electrification, navigation, water quality, recreation, economic development and many other benefits to the Tennessee Valley. As I read these early journals, I came across repeated references to people building dams and wells, planting, irrigating and harvesting seed, preserving the surplus and storing it in houses.
Development-induced displacement and resettlement (DIDR) occurs when people are forced to leave their homes and/or land as a result of development. This subset of forced migration has been historically associated with the construction of dams for hydroelectric power and irrigation but is also the result. Dams are huge man-made structures that act as barriers on a river. Today, the main reason people build dams is to produce electricity. They are also built to restrict and control the flow of water in a river. Throughout history, dams have been used to prevent flooding and to irrigate (water) farmland. Hundreds of built and proposed hydroelectric dams may significantly harm life in and around the Amazon by trapping the flow of rich nutrients and modifying the climate from Central America to the. People learned long ago that by building a dam across a river, they could hold back some of the river's water and store enough to meet their needs through a dry season. Land upstream of the dam had to be abandoned because it flooded, and the river would change downstream too, because it received less water and fewer floods.