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Shallow Aquifers
UNESCO Publishes First World Map of Underground Transboundary Aquifers
Posted on 02 Nov, 2008 11:29 AMForwarded to the Portal by: Anuradha The United Nations Educational, Scientific and Cultural Organization (UNESCO) will publish the first-ever world map of underground aquifers, which account for some 96 per cent of global freshwater resources, the agency announced in a press release today. Despite their strategic importance, no global inventory of aquifers , most of which straddle international boundaries , had been compiled before UNESCO started work on its online map, which will be launched to coincide with the submission to the General Assembly of a draft Convention on Transboundary Aquifers next week. The UNESCO is presenting a detailed map identifying underground water resources that are shared by at least two countries, using data compiled since 2000 by UNESCO's International Hydrological Programme for a groundwater database. The map will include information about the quality of water and rate of replenishment of the 273 transboundary aquifers , 68 in the American continent, 38 in Africa, 65 in Eastern Europe, 90 in Western Europe and 12 in Asia.
In pictures: 1000 year old bawadi in Patan, Gujarat
Posted on 06 Jun, 2008 06:55 AMRANI KI-VAV PATAN
Dipping water table in Kolar, Karnataka, leaves a Persian wheel forlorn and frustrated
Posted on 14 May, 2008 09:45 AMAs ground water levels decline in India, Persian Wheels cannot reach the water to draw them out from open wells. One such Persian wheel stands forlorn and frustrated as the water table has dipped in Kolar, Karnataka India. This wheel has worked for the last 80 years and 2007 was the first time that the water table fell and the wheel could not work for the day.
Persian wheel : The water lifting device in Kolar, Karnataka
Posted on 22 Jan, 2008 11:26 PM What exactly is a Persian wheel? Also known as Rahat (in Urdu), it's a simple water lifting device, where a number of small pots are attached to a long chain. Two gear wheels make up the system and as the first one is revolved, the pots each dip and swallow water from the well and soon after pours itself out to a metallic shaft which in turns empties into an intricate network of troughs that distributes water adequately through the cropped area. It is believed that the technology originated in Egypt and as world shrunk through extensive trading, it spread to India and China.