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Registros recuperados: 20 | |
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McCartney, Matthew P.; Lankford, Bruce A.; Mahoo, Henry F.. |
With contributions from Julien Cour, Reuben Kadigi, Japhet Kashaigili, Magayane Machibya, Abraham Mehari, Sylvie Morardet, Kossa Rajabu, Charles Sokile, Siza Tumbo, Barbara van Koppen, Thalia Vounaki and Daniel Yawson |
Tipo: Report |
Palavras-chave: River basin management; Water stress; Irrigation programs; Irrigation management; Irrigation efficiency; Water use; Water allocation; Wetlands; Water rights; Water law; Economic aspects; Water rates; User charges; Water users associations; Decision support tools; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy. |
Ano: 2007 |
URL: http://purl.umn.edu/37668 |
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Kendy, Eloise; Molden, David J.; Steenhuis, Tammo S.; Liu, Changming; Wang, Jinxia. |
The report examines the relationships between agricultural policies in the North China Plain, the approaches to water management that evolved from them, the quantity of water that was actually used, and the consequent groundwater depletion beneath Luancheng County, Hebei Province, from 1949 to 2000. To systematically address these relationships, we use a comprehensive water-balance approach. Our results indicate that a single, longstanding policy-that of using groundwater to meet the crop-water requirements not supplied by precipitation-is responsible for the steady rate of groundwater decline. |
Tipo: Report |
Palavras-chave: Agricultural production; Groundwater; Aquifers; Water shortage; Irrigation efficiency; Agricultural policy; Crop production; Wastewaters; Water management; Hydrology; Economic development; Crop yield; Cotton; Wheat; Sprinkler irrigation; Water conservation; Water use efficiency; Pumping; Water balance; Vegetables; Rural economy; Irrigated framing; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy. |
Ano: 2003 |
URL: http://purl.umn.edu/44560 |
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Araújo,Edcássio D.; Santos,Dionei L.; Alvino,Francisco C. G.; Ferreira,Lucas B.; Cunha,Fernando F. da. |
ABSTRACT Correct determinations of distribution (Ed) and application (EA) efficiencies allow adequate estimations of the gross irrigation depth. This study aimed: i) to determine the distribution efficiency using the Christiansen uniformity coefficient (CUC) in a sprinkler irrigation system under different weather conditions and working pressures; ii) to compare the mean, median, and cumulative CUC values; and iii) to evaluate the predictive capacity of four EA estimation models. CUC values were determined from 80 assessments, as well as the mean, median, and cumulative. The precipitated water depth accumulated in each collector was considered for the accumulated CUC. More uniform evaluations were used for EA (working pressure of 196 kPa), resulting in 20... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Uniformity coefficient; Irrigation efficiency; Evaporation and wind drift. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100024 |
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Registros recuperados: 20 | |
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