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The objective was to determine a mathematical model to calculate the deposition velocity of the mud resulting from the washing of aggregates from the Jobo Base Business Unit of Sagua de Tánamo, which is transported by pipelines. Sampling, granulometric and densimetric analyzes were carried out and a complete factorial experiment design with four tests and two replications each was used. The input variable, percentage of solids, was studied at four levels (4%, 12%, 20% and 28%). It was determined that the clay contained in the mud, due to its predominant granulometry of less than 40 µm, classifies as silt. It was also revealed that the density of the solid is 1,901 kg/m3. The results of the deposition velocity determined by indirect measurement and those predicted by calculations using the Durand model were compared, with the aim of improving its precision and reliability, obtaining a relative coincidence error of less than 5%. A correction function is determined that quantifies the relationship between gravitational sedimentation velocity and deposition velocity. [ABSTRACT FROM AUTHOR]

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Of the 6,5 million ha with hydro agricultural infrastructure in Mexico, 10% have problems with salinity and drainage. 16% of the 7,5 million hectaresof humid tropic with agricultural potential, has shallow phreatic table, floods and soil acidity. This problem in the areas of irrigation is increased by 10 000 ha/year with productive decrease of 25%. Since 1992, IMTA developedand transferred subsurface drainage technologies for the rehabilitation of saline in arid soils and management of the regime of soil moisture with lot controlled subsurface drainage in wet areas. Production increases of 20% to 93% in wheat were obtained with agricultural drainage and about 200% in sugar cane, thus economic and production indices have increased with this technology. [ABSTRACT FROM AUTHOR]

Copyright of Agricultura Sociedad y Desarrollo is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)