Approximately half of the irrigated area of Iran falls under different types of salt-affected soils and average yield losses may be as high as 50 percent. Slightly and moderately salt-affected soils are mostly found on the piedmonts at the foot of the Elburz (Alborz) Mountains in the northern part of the country. The soils having severe to extreme salinity are predominantly located in the Central Plateau, the Khuzestan and Southern Coastal Plains and the Caspian Coastal Plain.
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Showing items 1 through 9 of 22.-
Library ResourceRapports et recherchesdécembre, 2007Iran
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Library ResourceRapports et recherchesdécembre, 2007
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Library ResourceRapports et recherchesdécembre, 2007Sri Lanka, Asia du sud-est
Many decisions on water allocation in river basins are made on economic grounds. Environmental and social benefits of water should also be considered in river basin management, and attempts should be made to value them similarly. This is not a straightforward task and very few studies have directly addressed this issue to date. In this paper, the Menik Ganga (River) in southern Sri Lanka is used as a case study to attempt and evaluate the costs and benefits of environmental water allocations, referred to as ?environmental flows? (EF).
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Library ResourceRapports et recherchesdécembre, 2007
The authors reflect on the theory and process of creating effective strategies for adaptive river basin management. We formulate our framework from observations of responses to environmental and hydrological change in the Great Ruaha River in Tanzania. We find that problems occur in the pursuit of 'integrated water resources management' (IWRM) that can be attended to by applying a focused expedient approach in three states of the water availability regime: 'critical water', 'medial water' and 'bulk water'.
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Library ResourceRapports et recherchesdécembre, 2007Kirghizistan, Asie central
Continuous institutional changes in the rural sector in Central Asia have negatively affected the reforms and the development of other related sectors, e.g. the irrigation sector. Therefore, reforms in the irrigation sector have been carried out in an ever changing and uncertain environment. Institutional changes have so far been aimed the farm level that was formerly managed by collective and state farms. Replacement of relatively few collective farms by thousands of individual farming units has resulted in chaos and anarchy in water management at on farm level.
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Library ResourceDocuments de politique et mémoiresdécembre, 2007Éthiopie, Afrique orientale
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Library ResourceDocuments de politique et mémoiresdécembre, 2007
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Library ResourceDocuments de politique et mémoiresdécembre, 2007Inde, Asie méridionale
Developing countries like India are actively being encouraged to move from the traditional supply-side orientation towards proactive demand management under the broad framework of Integrated Water Resources Management (IWRM). Integrated Water Resources Management (IWRM) is a sound philosophy which is hard to disagree with.
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Library ResourceArticles et Livresdécembre, 2007
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Library ResourceDocuments de politique et mémoiresdécembre, 2007
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