Capillary flow in agricultural drainage Public Deposited

http://ir.library.oregonstate.edu/concern/administrative_report_or_publications/xw42n8299

Published August 1977. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog:  http://extension.oregonstate.edu/catalog

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  • The process of drainage of soil water is customarily treated as a fully saturated flow phenomenon. Recent work of several cooperating scientists is reported to illustrate that the partially saturated zone can significantly influence the overall performance of agricultural drains, particularly with respect to maintenance of a desirable root environment and when the soils encountered are either quite shallow or very fine textured. In the first section, the capillary properties of soils pertinent to drainage are described. Both laboratory and fields measurement techniques are proposed. Experimental data illustrate the utility of these techniques. The second section details necessary considerations for modeling capillary flow systems and presents models successfully used to predict both vertical drainage of the soil profile and horizontal flow associated with a sloping water table. The final section describes results of numerical analyses of both sloping aquifers and parallel drain systems. The capillary region is shown to have considerable influence upon both the predicted water table position and the relation between water table depth and depth of soil which is adequately aerated to allow root development
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