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Takato Dam, a gravity dam in Japan
Takato Dam, a gravity dam in Japan

A dam is a structure that impounds water or restricts its flow. The four types are gravity dams (example pictured), embankment dams, buttress dams, and arch dams. Dams provide irrigation, hydropower, water supply, flood management, recreation, inland navigation, and fish farming. An early dam was the Jawa Dam in modern Jordan, built around 3000 BCE. From the late 18th century, the process of designing dams changed from an informal practice to an engineering discipline. In the 20th century, the widespread availability of concrete led to the creation of many large dams worldwide. Dams may include locks, fish ladders, spillways, and power stations. Dams occasionally fail, resulting in flooding and loss of life. Organized opposition to dam projects emerged in the modern era, focused on environmental and social impacts such as the loss of plant and animal habitats, reduced water and sediment flow, degraded landscape aesthetics, the submergence of cultural sites, and forced relocations of people. (Full article...)

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Stongdey

Stongdey is a village in the Zanskar valley in Ladakh, India, situated on the right bank of the Zanskar River, about 18 km (11 mi) northeast of Padum. Stongdey and the neighbouring village of Kumik had a combined population of 914 in the 2011 census. The local economy is largely agrarian, with snowmelt-fed irrigation compensating for the region's low precipitation. The villages have schools, electricity and mobile-phone service. Stongdey Monastery, founded in 1052, overlooks the village and is Zanskar's second-largest monastic institution. This photograph shows Stongdey from the northeast, with the Zanskar Range in the background.

Photograph credit: Timothy A. Gonsalves

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Shayok Misha Chowdhury
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Bangkok floods
Bangkok floods

September 30: National Day for Truth and Reconciliation in Canada; Martyrs' Day in China

A building damaged by the 2009 Sumatra earthquake
A building damaged by the 2009 Sumatra earthquake
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