EARTH458 Lecture Notes - Lecture 10: Video Lesson, Vadose Zone, Loam
17 Jul 2020
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6. 4. 2 controls on soil water movement, video lecture. Also called a characteristic curve is dependent on the range of pore sizes in the soil. The smaller the pores, the greater their ability to retain water at negative pressures or tensions. The degree of dryness of a soil is a function of its pressure condition. At more negative pressures or tensions, water will tend to reside only in the smaller pores and air fills the larger pores. High pore water retention it becomes dryer. Silt loam starts at high initial soil water content and gradually decreases. Clay is the finest sediment and is able to retain more soil water as tension increases. The capillary fringe exists above the water table. It refers to the tension saturated zone immediately above the water table water is held under slight tension to get the poorest medium remain saturated.
