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A model for predicting water table fluctuations in layered soils

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dc.contributor.advisor Brooks, Royal H.
dc.contributor.advisor Corey, Arthur T.
dc.creator Saluja, Harash V.
dc.date.accessioned 2011-05-05T21:13:25Z
dc.date.available 2011-05-05T21:13:25Z
dc.date.copyright 1977-10-13
dc.date.issued 1977-10-13
dc.identifier.uri http://hdl.handle.net/1957/21134
dc.description Graduation date: 1978 en_US
dc.description.abstract Water tables in many soils of the Willamette Valley of Western Oregon are often near the surface. This is because they are underlain by a relatively impermeable layer at a shallow depth, and the rainfall during the winter months greatly exceeds the evapotranspiration. The high water tables combined with fine-textured soils cause the specific yield of the soils to be extremely sensitive to the exact position of the water table at any particular time. Methods commonly used for predicting water-table fluctuations in response to rainfall assume that the specific yield is a constant for a particular soil. This assumption is not valid for many soils of the Willamette Valley. However, an estimation of water-table fluctuations is needed for the identification of drainage problems and for the design of drains. To obtain a more satisfactory method of predicting water-table fluctuations for such soils; models were constructed to extrapolate data from observation of water-table fluctuations for short periods of time. Models were constructed for both naturally and artificially drained soils. When the models were constructed using data for an appropriate period, i.e., when the hydraulic conditions of the soil profile were similar to those for which predictions were made, the models gave results in close agreement with observed water-table fluctuations. The inputs required for the model are rainfall amounts as a function of time and the initial water-table position. The output is the watertable elevation as a function of time. The model also calculates an index, evaluating the quality of drainage in the field, by taking into account the elevation of the water table and the length of time that a water table remains closer than 30 centimeters to the soil surface. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Water table en_US
dc.title A model for predicting water table fluctuations in layered soils en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Agricultural Engineering en_US
dc.degree.level Master's en_US
dc.degree.discipline Engineering en_US
dc.degree.grantor Oregon State University en_US
dc.description.digitization File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR en_US


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