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Historical Background: Legends relate that an eagle eating a snake landed on a cactus (Aztec) on a barren island near the southwest shore of Lake Texcoco and so began the marking for a new city. The Aztecs began the development of Tenochtitlan on a sacred site in 1325. On a nearby island another Indian group began Tlaltelolco in 1327. By the time the Spaniards arrived in 1519, Tenochtitlan had forcibly incorporated Tlatelolco and had been filled in the lagoon between the two towns. The Spaniards raised the Aztec capital and on that site began to erect Mexico City in 1521. The new Spanish city extended to the south and west as a gridiron of square blocks divided into house lots. Mexico City remained Spanish until Mexican independence in 1821. By 1920 the Mexican capital had 620,000 residents and was a modern city in all respects. In 1931 outlying towns were legally annexed, giving Mexico City the major sub districts and street pattern that characterize it today.
Population In Mexico City Over The Last 50 Years
Quality of "Basic Needs": The rapid growth of Mexico City has created several problems, one being an increasing inadequate water supply, and the sinking, by as much as 6 m of parts of the downtown area into soft lake deposits that underlie much of the city damaging buildings and disrupting some water and sewage lines. Given the tremendous size and population of the Mexico City Metropolitan Area and its dependence on the aquifer for almost three-quarters of its drinking water supply, the protection of ground water quality is of utmost concern. Wastes from domestic, industrial, and commercial activities contain a variety of human pathogens and toxic contaminants that may pose a hazard if not properly managed. The potential for these contaminants to leach into the ground water depends on many factors, such as the composition of soils and geologic materials, the depth of the water table, the recharge rate, and environmental factors that can influence the mobility or degradation of contaminants.
About 7 percent of the water is passed to 27 different treatment plants where it is treated, and this joins the remaining untreated water to make its way into the Tula catchment and from there to the Gulf of Mexico. Since the sewage lagoons and reservoirs, sewage plants, landfills, garbage tips and the black water canals are all situated on the aquitard which overlies the Mexico City aquifer, there is ample cause for concern that eventually there could be cross contamination of bacteria and chemicals from leachate and the contaminated surface waters into the underlying potable water supplie
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Keywords referenced in this term paper
mexico city, air pollution, metropolitan areas, air quality, Texcoco Lake, Lake Texcoco, ground water, water pollution, the spanish city, Population Growth, air quality index, Autonomous University, environmental pollution, water quality, problems, aztec, water shortages, drinking water, water table, potable water, geological fault line, World Health Organization, World Resources Institute, quality standards, Mexican independence, social problems, soil, Alberto Kalach, Federal District, contaminants, environmental factors, soil degradation, car thefts, much more, sulfur dioxide, nitrogen dioxide, Street crime, sewage, environmental disaster, Los Angeles, Tenochtitlan, Federal Government, developing country, police corruption, Poor people, east and west, middle class, little room, Latin America, climatic change,