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Water resources in many parts of Mexico are under stress, especially in the arid northwest and central regions where most of the population lives and most of the economic activities are located. The country has put in place a system of water resources management that includes both central (federal) and decentralized (basin and local) institutions. Despite many achievements, the water resources sector in Mexico still faces some challenges, including: (i) increasing water scarcity, (ii) over-exploitation of freshwater resources, especially groundwater, (ii) deteriorating water quality, (iii) lack of financial sustainability of the water sector, (iv) modernizing water supply and sanitation services, (v) improve competitiveness and efficiency of irrigation, (vi) strengthen water institutions, (vii) adapt to climate change impacts, especially droughts and floods. == History and recent developments == Mexico has a long and well-established tradition on water resources management (WRM) which started in the 1930s when the country began investing heavily in water storage facilities and groundwater development to expand irrigation and supply water to the rapidly expanding population. The 1934 Código Agrario, promulgated during the Cárdenas administration (1934-1940), granted the federal government sweeping powers to define the "public interest" to which water could be harnessed. By virtue of such legislation, between the 1930s and 1970s, the ejido sector and rural communities were subject to direct federal control over water. Private landowners, on the other hand, enjoyed the benefits of federally subsidized irrigation infrastructure and guaranteed market prices. Over time, large landowners became highly capitalized, while small farmers, by the 1970s, were suffering from the effects of water monopolies. In the 1970s, the Mexican government entered into a tripartite agreement with the World Bank, and the United Nations Development Program to prepare the 1975 National Water Plan (NWP) which identified the need to enact a National Water Law (NWL) and a National Water Authority as well as decentralize responsibilities and promote water user participation in operational and maintenance (O&M). The NWP spurred a significant institutional development and infrastructural achievements. In 1983 the federal government transferred the responsibility for water supply and sanitation to municipalities and states. The Mexican Institute of Water Technology (IMTA) was established in 1986, and the National Water Commission (CONAGUA, sometimes also called CNA in 1989). Also in 1989 the first Basin Council in Lerma–Chapala was created, incorporating water users from multiple sectors. During the 1990s, Mexico's groundwater boom took place with rapid development and pumping of aquifers for combined agricultural, urban, and industrial demand. Also the federal government (CNA) decentralized responsibility for large irrigation infrastructure to autonomous agencies (irrigation districts). In 1992, Mexico adopted a National Water Law, which contained specific provisions for the role of the CNA, the structure and functioning of river basin councils, public participation in water management, etc. In 1993, the Cutzamala system was completed, becoming one of the largest pumping schemes in the world, pumping 19 cubic meters of water per second into the Mexico City Metropolitan area, over a difference of altitude of 940m and a distance of 162 km. In 1997 the first technical groundwater committee was created to manage an overexploited aquifer in the state of Guanajuato. With the 2004 Revision of the National Water Law, the thirteen decentralized CNA regions would become basin organizations serving as the technical arm of more broad-based basin councils that incorporate civil society interests including the private sector and citizens’ groups. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Water resources in Mexico」の詳細全文を読む スポンサード リンク
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