Suchergebnisse

El presente artículo, derivado de investigación, presenta un primer avance de algunas preguntas que han surgido respecto del abastecimiento sostenible y real de agua para Medellín, su calidad y los negocios que circulan en torno a este preciado recurso, presenta este texto, algunos hallazgos que nos posibilitan generar algunas líneas de análisis, con el fin de aportar en el necesario debate público, al respecto.

En las márgenes de la Ciénega de Tláhuac se encuentran actualmente asentamientos humanos y se desarrollan actividades agropecuarias
que impactan el medio acuático por las descargas de aguas residuales. Debido a ello, este trabajo evalúa la calidad del agua y la compara con
información publicada hace 20 años. Los resultados muestran alta conductividad derivada de escurrimientos agropecuarios periféricos que
emplean fertilizantes, elevada dureza, altos contenidos de sulfatos, pH alcalino, concentración de oxígeno disuelto desde sobresaturación
hasta hipoxia o anoxia, una hipereutrofización con elevados niveles de nitrógeno y fósforo totales, además de contaminación bacteriana
por coliformes fecales. Los resultados encontrados son más altos comparados con los de 20 años atrás y señalan una mala calidad del
agua, en particular hipereutrofizada.

Buzau River is one of the most important tributaries of Siret river. The lower section of Buzau river is situated in an area of low plain which undergoes an active subsidence. The characteristics of the river's water flow were analysed on the period between 1956 and 2011, by considering the values of the mean flow measured
at the two hydrometric stations situated in the river's lower section, Banita and Racovita. Mean water flow variability analysis in the lower section of Buzau river shows its fluctuations on annual scale and the multiannual trends for a 56-year time lapse in a region that is vulnerable to the flood risk. The great flows variability is caused by the irregular rainfall distribution over time which is specific to the eastern part of the Romanian Plain. These oscillations are also reflected in the variation of Buzau river annual mean flows that present a drop for the analysed period. Although there is a strong correlation
between the discharges measured at the two stations, a loss of water is observed downstream the Banita station, meaning a reduction of water
resources in an area frequently affected by drought.

This article analyzes the Mennonite migration process from the arid plains of Chihuahua in northern Mexico to South America's Santa Cruz in Bolivia, associating intensive use of underground water resources to migration as a trigger. The analysis in this research suggests that the Mennonite migration model has found social conditions in Latin American countries, particularly in their transition from Mexico to Bolivia, that has allowed it to flourish. The results indicate opportunities for devising social integration policies that promote environmental sustainability at the Mennonite migration host communities.

Water resources and distribution in France; geological, sociopolitical, environmental, and economic perspectives; 16 articles.

Examines the effect of political change, reform, and modernization on drinking water policy at the state level; concludes that increased legitimacy, transparency, and better governance render more efficient service and encourages public support; 1990s; city of Mexicali, Mexico. Summary in English p. 500.

Examines political factors affecting equitable apportionment of water resources in the Middle East; regional ambitions, impact on the peace process, and other issues.

Competing demand for limited water resources in the Jordan river basin; highlights attempts being made in context of the Middle East multilateral peace talks to develop a legal framework for equitable utilization of the Jordan river basin and groundwater in the West Bank. Summary in English p. 758.

Compares France's water management policy to that of other European countries; privatization, regional management, and other issues. Summary in English p. 528.

Examines water resources in the Mediterranean region; some focus on potential conflict in the Middle East river basin.

Discusses water supply as a strategic asset and means to assert regional political pressure in the Middle East; technical solutions and financial limitations. Summaries in English p. 474 and Spanish p. 488. Examples of Israel's water policy in southern Lebanon, the Golan Heights, and Palestinian territories, water resource management by Turkey, and possible water shortages in Jordan.