By Claude Boyd, Aaron McNevin
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4). Ponds can be constructed by excavating a basin in which to store water (Fig. 5). Excavated ponds usually are small because of the large volume of earth that must be removed to form them. Water for filling excavated ponds may come from wells, streams or lakes, irrigation systems, or overland flow. 4 Deep-water intake structure. 5 An excavated ﬁsh pond in Thailand. Courtesy of David Cline. shallow, excavated ponds may fill by groundwater seepage. Excavated ponds cannot be drained, and their water levels may fall drastically in the dry season as the water table declines.
FAOSTAT. Production. 2013. Accessed: 10/15/2013. org/faostat-gateway/go/ to/download/Q/*/E. World population 25 been enough agricultural land to provide sufficient food for the population boom. The amount of agricultural land increased by only about one-tenth between 1961 and 2010. But food production tripled, and there was a modest amount of more food per capita in 2010 than in 1961. Based on 1961 agricultural yields about 147 million km2 of agricultural land would be needed to produce the amount of food produced in 2010—more area than the earth’s land surface excluding Antarctica.
Htm). Despite the extent of poverty in the world, Kharas and Gertz (2010) predicted that the world middle class is poised to expand exponentially in the coming decades as a result of improving economies in China and several other Asian nations. Kharas and Gertz defined the middle class as households with daily expenditures between US$10 and US$100 per person in purchasing power parity. 884 billion by 2030. Thus, the middle class could increase from 30% of global population in 2009 to more than 60% by 2030.