12WKEXAM.07

12WKEXAM.07 - Name _ SOIL SCIENCE 322 Physical Principles...

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1 Name _____________________________ SOIL SCIENCE 322 Physical Principles of Soil and Water Management 12-Week Exam April 19, 2007 1. (15 points) (a). Explain what we mean by a hydrophobic soil including conditions by which you understand a soil might become hydrophobic. (b). If water rises above a zone of saturation (such as a water table) into soil pores above the water table of a wettable soil with a contact angle of zero (0) to a height of 5.1 cm, then how high will it rise in this soil if it were to have reduced wettability and now has a contact angle of 45 degrees? Assume the surface tension of water is 72.8 x 10 N/m (72.8 dynes/cm). Note: cos 45 is 0.707. -3 o 2. (15 points) With respect to water flow, what is the difference between (a) saturated and unsaturated flow and (b) differences in Darcy’s equation for describing flow in both cases? You should consider all the parameters of the equation that are different for the two flow conditions.
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2 3. (5 points) (a) From the information in the diagram below, show the direction of water flow
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12WKEXAM.07 - Name _ SOIL SCIENCE 322 Physical Principles...

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