Résultats de la recherche
Showing items 1 through 9 of 19.-
Library ResourceArticles et Livresoctobre, 1989
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Library ResourceArticles et Livresdécembre, 1989Soudan
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Library ResourceArticles et Livresoctobre, 1989
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Library ResourceArticles et Livresdécembre, 1989Équateur
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Library ResourceArticles et Livresdécembre, 1989
The ionic composition of water in the vadose zone of the Salt River Valley in south central Arizona was studied for three different water regimes: desert, irrigated, and flooded by urban runoff. The desert area exhibited high salinity in the top 10 m, probably due to concentration of salts over several years. Below 15 m, the salinity decreased with depth and approached the salinity of the native ground water. For the irrigated area, the chemical composition of the soil water was similar to that of the applied water but concentrations were higher.
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Library ResourceArticles et Livresdécembre, 1989Amérique latine et Caraïbes
Recoge textos elaborados en los últimos años por expertos de la CEPAL y por autores externos para la Unidad Conjunta CEPAL/CNUAH de Asentamientos Humanos, en cumplimiento de su programa de trabajo. Los textos se agrupan segun 3 líneas temáticas, 1) Areas críticas para la formulación de políticas de asentamiento humano en América Latina y el Caribe, 2) Metropolización y crisis, y 3) Planificación y gestión del desarrollo nacional: el rol de los gobiernos locales.
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Library ResourceArticles et Livresdécembre, 1989
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Library ResourceArticles et Livresdécembre, 1989Sri Lanka, Asia du sud-est
This paper analyzes irrigation operational problems, and their institutional causes, on a new irrigation system in southern Sri Lanka, based on research during disastrous drought. The authors offer a number of suggestions for improving the management of this system.
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Library ResourceArticles et Livresdécembre, 1989Pakistan, Asie méridionale
This paper is a preliminary effort to define the extent of irrigation in Pakistan's mountain regions. Attention is given to some changes already begun in this environment through new irrigation development activities. Important knowledge gaps that need to be filled by more systematic and multidisciplinary research are identified.
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Library ResourceArticles et Livresdécembre, 1989Pakistan, Asie méridionale
This paper presents an overview of the current state of knowledge on the relations between irrigation management in Pakistan and the incidence of waterlogging and salinity. It is emphasized that management research should focus on the whole system, including surface and ground water resources. The paper also highlights key management questions that need to be addressed such as salt and water balance and water loss from canals, water courses and field channels.
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