Topography of Pakistan which facilitated the emergence of intensive cultivation despite semi-arid conditions, resulted in important social and political transformations. Satellite image of the Tarbela Dam Pakistan has two major river dams: the Tarbela Dam on the Indus River, near the early Buddhist site at Taxila, and the Mangla Dam on the Jhelum River, where Punjab borders Azad Kashmir built as part of the Indus Basin Project. The Warsak Dam on the Kabul River near Peshawar is smaller. These dams, along with a series of headworks and barrages built by the British and expanded since independence of Pakistan in 1947, are of vital
Risks to the Glen Canyon Dam of between 500–700 years. Glen Canyon Dam is a concrete arch dam on the Colorado River in northern Arizona in the United States, just north of Page. The dam was built to provide hydroelectricity and flow regulation from the upper Colorado River Basin to the lower. Its reservoir is called Lake Powell, and is the second largest artificial lake in the country, extending upriver well into Utah. The dam is named for Glen Canyon, a colorful series of gorges, most of which now lies under the reservoir. Construction of Glen Canyon Dam started in 1956 and was not finished until